JP2004272969A - Recording/reproducing device, recording/reproducing system and control method of magnetic disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a method for controlling the access performance of a recording/reproducing device (magnetic disk drive) by a host device. <P>SOLUTION: In the recording/reproducing device of the case the magnetic disk drive is adopted, the access performance of the magnetic disk drive can be controlled by the host device in such a manner that a command processing performance parameter for setting the access performance to the host device from the magnetic disk drive is presented and on the basis of a reception parameter 1001 of this presented command processing performance, the host device specifies the command processing performance by changing to a response time function parameter 1002 desired by the host device. Further, the efficient system operation is realized by the host device in the manner of controlling the host operation on the basis of the response expecting time for every command from the magnetic disk drive. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００５４】
さらに、書き込み時と読み出し時で必要に応じてパラメータを別々に提供しても、もちろん構わない。以上により、ディスク装置のコマンド処理性能パラメータを受領することができる。
【００５５】
図６は、応答時間関数パラメータを簡易な式で近似する方法、図７にその時のホスト装置に渡すパラメータのフォーマット例を示す。図６では、応答時間関数を２つの１次関数で近似したものである。図６では移動セクタ数Ｓ１を境に、ｆ１（ｓ）＝Ａ１×Ｓ＋Ｂ１の関数６０１とｆ２（ｓ）＝Ａ２×（Ｓ−Ｓ１）＋Ｂ２の関数で分けている。それぞれ、Ａ１，Ａ２は傾き、Ｓ，（Ｓ−Ｓ１）は移動セクタ範囲、Ｂ１，Ｂ２はオーバヘッドを示す。
【００５６】
これから、図７が具体的にホスト装置へ提供するパラメータのフォーマットである。ホスト装置の受領パラメータ７０１になるこのフォーマットには、応答時間関数のパラメータ７０２となる情報が格納されている。図７では、書き込み用と読み出し用で関数を分け、前記図６で示したように１つの応答時間関数に対して２つの１次関数で近似しているため、４つの関数パラメータが必要になる。すなわち、Ｗｒｉｔｅ用は移動セクタ範囲Ｓｗ１，Ｓｗ２、オーバヘッドＢｗ１，Ｂｗ２、傾きＡｗ１，Ａｗ２が必要で、Ｒｅａｄ用は移動セクタ範囲Ｓｒ１，Ｓｒ２、オーバヘッドＢｒ１，Ｂｒ２、傾きＡｒ１，Ａｒ２が必要である。
【００５７】
さらに、媒体転送速度、格納Ｂｙｔｅ数で表すようにした。格納Ｂｙｔｅは、応答時間関数パラメータ７０２の格納Ｂｙｔｅ数を示すものである。ここで、応答時間関数を表す関数として、ここでは１次関数で近似したが、２次関数以上を使えるように関数パラメータには、関数ＴＹＰＥを選べるように、本実施の形態では示した。もちろん、ホスト装置とディスク装置間の性能パラメータ送受の取り決めから、フォーマット変更はもちろん構わない。以上により、ディスク装置の性能パラメータ提供をホスト装置に容易にできる。
【００５８】
図８は、ここまでディスク装置から提供を受けた性能パラメータを元に、ディスク装置にパラメータをセットする方法を示す。これは、ホスト装置からパラメータセット要求８０１，８０２，８０３で行う。ＡＴＡコマンドの場合、ＳＥＴＦＥＡＴＵＲＥＳコマンドとｔａｓｋ ｒｅｇｉｓｔｅｒのパラメータで行えばよい。図９に、ｔａｓｋ ｒｅｇｉｓｔｅｒにセットするパラメータのフォーマット例を示す。
【００５９】
これは、ＳＥＴ ＦＥＡＴＵＲＥＳコマンドフォーマットに従って、ｔａｓｋｒｅｇｉｓｔｅｒの設定パラメータ９０１に従う。まず、Ｓｕｂｃｏｍｍａｎｄ ｃｏｄｅにアクセス性能セット用コードを現在未使用番号に割り当て、そのセットコード（Ｓｅｃｔｏｒ Ｃｏｕｎｔ，Ｓｅｃｔｏｒ Ｎｕｍｂｅｒ，Ｃｙｌｉｎｄｅｒ Ｌｏｗ，Ｃｙｌｉｎｄｅｒ Ｈｉｇｈ，Ｄｅｖｉｃｅ／Ｈｅａｄ）ごとに決めた、各Ｓｕｂｃｏｍｍａｎｄに値をセットする。ここに、図に示す様な関数パラメータ（Ｂｗ１’，Ｂｗ２’，Ｂｒ１’，Ｂｒ２’）や装置名称（Ｄｒｉｖｅ Ｃ）を特定するコードをセットした後、ｃｏｍｍａｎｄ ｒｅｇｉｓｔｅｒにＳｅｔ ＦｅａｔｕｒｅコマンドコードＦＥｈを書き込めばよい。
【００６０】
特に、装置名称で指定された場合、ディスク装置は、ホスト装置から見た場合の動作をまったく同じ動作にしてもよい。このようにすることで、適用装置において、このディスク装置を装着した場合、適用装置の仕様のまま使うことができ、もしライフサイクルが終了して当時のディスク装置が手に入らなくても、適用装置に装着可能になる。もちろん、コマンドでディスク装置の仕様を変えなくても、ディスク装置の何の装置仕様で動作すればよいかを指定できれば、たとえば、ディスク装置上のジャンパ等だが、それでも問題はない。
【００６１】
図１０には、応答時間関数設定パラメータのセットするためのフォーマット例を示したものである。この場合は、前記図７で示したディスク装置から受領した受領パラメータ１００１から、ホスト装置が望む応答時間に応答時間関数パラメータ１００２を変更したもの（Ｗｒｉｔｅ用は移動セクタ範囲Ｓｗ１’，Ｓｗ２’、オーバヘッドＢｗ１’，Ｂｗ２’、傾きＡｗ１’，Ａｗ２’、Ｒｅａｄ用は移動セクタ範囲Ｓｒ１’，Ｓｒ２’、オーバヘッドＢｒ１’，Ｂｒ２’、傾きＡｒ１’，Ａｒ２’）を格納するものである。この場合は、このパラメータをディスク装置にセットするための専用コマンドを設けてももちろん構わない。
【００６２】
また、全関数パラメータをセットするのではなく、関数のオーバヘッドのみを設定して、応答時間関数をＹ軸方向に線形移動することでも構わない。もちろん、同様の機能が実現できれば、前記図８〜図１０で示した手法にはもちろんとらわれない。このようにして、ディスク装置に新たにホスト装置によって設定されたアクセス性能を示す関数により、ディスク装置はホスト装置が望むアクセス性能を示すことができる。
【００６３】
図１１は、ここまで説明してきた磁気ディスク装置を採用した記録再生装置の電子回路の構成を示したものである。この記録再生装置１１１２の電子回路は、Ｒ／Ｗ回路１１０１、ディスクフォーマッタコントロール部（ＤＦ）１１０３とＭＰＵＩ／Ｆコントロール部１１０４とＥＣＣ処理部１１０６とバッファコントロール部（ＢＭ）１１０７とホストバスＩ／Ｆコントロール部（ＨＢＩ）１１１０とＩＤ生成部１１２３とコマンド終了予想時間生成部１１２５を含むデータ処理部１１０２、ＭＰＵ１１０５、データバッファ１１０９、Ａ／Ｄ変換器１１０８とＤ／Ａ変換器１１１７を含むメカ制御部１１１１、フラッシュメモリ（ＦＬＡＳＨ）１１２４などから成る。ホストバスＩ／Ｆコントロール部１１１０にはホスト装置１１１３が接続され、Ｒ／Ｗ回路１１０１には機構部１１１４が接続されている。
【００６４】
この記録再生装置１１１２の動きを、標準的なデータ書き込み時の様子で説明する。ここでは、記録再生装置１１１２とホスト装置１１１３が標準的なインタフェースを介して接続されている場合を考える。
【００６５】
まず、ホスト装置１１１３は、この記録再生装置１１１２に格納されているアクセス性能情報を取り出し、アクセス性能を把握する。この時、記録再生装置１１１２としてサポートしている従来製品番号でも構わない。これにより、ホスト装置１１１３側では、どのような性能をディスク装置に望むかを検討してディスク装置のアクセス性能パラメータを設定すればよい。
【００６６】
この後、ホスト装置１１１３からデータ書き込みをする指示が記録再生装置１１１２にインタフェースプロトコルに従って送られてくる。記録再生装置１１１２に転送されて来たコマンドは、記録再生装置のデータ処理部１１０２にあるＨＢＩ１１１０で受け取られた後、ＭＰＵ１１０５に送られ、コマンド解釈が行われる。これで、ＭＰＵ１１０５は、ドライブの該当セクタのデータの書き込み指示であることが判明する。さらに、ＭＰＵ１１０５でデータ書き込みと判断できると、ホスト装置１１１３より指示された該当セクタの書き込み準備作業をＭＰＵ１１０５は開始する。
【００６７】
この記録再生装置１１１２において、機構部１１１４は、記録媒体１１２１、ヘッド１１２２、ヘッドを駆動するためのＶＣＭ（Ｖｏｉｃｅ Ｃｏｉｌ Ｍｏｔｏｒ）１１１５、記録媒体を回転するためのスピンドルモータ１１１６などから成る。この機構部１１１４を該当セクタのデータ書き込みができる様に、ＭＰＵ１１０５からの指示によりメカ制御部１１１１に指示が行われる。
【００６８】
そして、メカ制御部１１１１は、Ｒ／Ｗ回路１１０１からの位置信号から、モータドライバに指示をして機構部１１１４の制御を行い、ヘッド１１２２を記録媒体１１２１の該当トラックに位置づける。この最中にホスト装置１１１３とＨＢＩ１１１０間は、そのプロトコルに従って書き込みデータをＨＢＩ１１１０からＢＭ１１０７経由でデータバッファ１１０９に一時格納する。
【００６９】
さらに、ヘッド１１２２の位置決めのために、記録媒体１１２１から読み出されたサーボ領域のデータはＲ／Ｗ回路１１０１を経由してシリアルパルスデータとしてＩＤ生成部１１２３に取り込まれる。このとき、バイトシンク検出を行い、これをもとにシリアル−パラレル変換を行う。
【００７０】
ここで、サーボＩＤが正しく読み出されると、この値から物理セクタ番号算出、そしてデフェクト処理後の論理番号算出を行い、ドライブＩ／Ｆコントロール部に論理セクタ番号を渡す。これにより、該当セクタかどうかの判断後、希望セクタの場合、データ書き込みが行われ、Ｒ／Ｗ回路１１０１でＮＲＺ（Ｎｏｎ Ｒｅｔｕｒｎ ｔｏ Ｚｅｒｏ）信号がアナログ信号に変換される。この信号が記録媒体１１２１上に書き込まれる。
【００７１】
このとき、書き込みデータはデータバッファ１１０９からＤＦ１１０３経由で書き込まれるが、ここで、媒体読み出し時のデータチェックと訂正を行えるＥＣＣコードをＥＣＣ処理部１１０６でデータにセクタ単位で付加する。また、書き込みセクタが後発欠陥セクタでｓｌｉｐ処理をすべきかどうかはＩＤ生成部１１２３で行う。これができるのは、従来技術である記録再生装置の欠陥セクタ処理を活用すればよい。読み出しはこの逆の手順で進めればよい。
【００７２】
ここでは、ホスト装置１１１３でディスク装置のアクセス性能を指定してからデータの書き込みを行ったが、コマンドがホスト装置から発行されると、コマンド終了予想時間生成部１１２５を設けて、コマンドをホスト装置が与えたときに、ホスト装置が受領することで、ホスト装置がディスク装置のアクセス制御を行う手法を行うことでももちろん構わない。
【００７３】
さらに、前記図１に示したようにホスト装置に対して、複数台のディスク装置がつながれている場合、各ディスク装置のアクセス性能差を設けて、ディスク装置のアクセス性能を設定することで、記録装置の階層構造を作ることができ、効率的な記録装置システムを作るのももちろん構わない。
【００７４】
図１２は、ディスク装置における欠陥セクタの管理、処理方式（集中方式）を示した図である。これは、記録媒体１２０１に３箇所のトラック当たりのセクタ数が異なる場所、これをＺＯＮＥと一般的に呼ぶが、ＺＯＮＥ０（１２０２）、ＺＯＮＥ１（１２０３）、ＺＯＮＥ２（１２０４）が存在する。ここで、ＺＯＮＥ１に注目すると、ここはトラック当たりＡ＋１セクタでｎ＋１トラックが存在する場合で説明する。
【００７５】
図に示すように、トラックの先頭をＩＮＤＥＸ１２０５と呼ぶが、これを持ったトラックがｍトラック１２０６〜（ｍ＋ｎ）トラック１２１０までを図で示している。例えば、ＨＥＡＤ＝０の場合、ｍトラック１２０６はＣｙｌｉｎｄｅｒ番号＝ｍ、Ｈｅａｄ番号＝０となる。また、トラック番号が増える隣接トラック（ここでは１２０６→１２０７など）にヘッドが移動する場合のヘッドの移動時間後に、次トラックのヘッドの先頭セクタがくるようにセクタ番号をずらし（これをｓｋｅｗと呼ぶ）、これをｓｋｅｗ＝２として説明する。
【００７６】
ディスク装置には、工場出荷までに検出された読み書きに適さないセクタ位置を示す初期欠陥セクタと、工場出荷後に発生した欠陥セクタの情報である後発欠陥セクタが存在する。このセクタの使用として、図に示すように、初期欠陥セクタ１２１１はｓｌｉｐ処理で、後発欠陥セクタ１２１２はｓｋｉｐ処理が存在する。後発欠陥処理は、図では、（ｍ＋ｎ−１）トラック１２０９〜（ｍ＋ｎ）トラック１２１０の交代セクタ１２１３である予備エリアを使う方式になっている。例えば、（ｍ＋ｎ−１）トラックではＢ＝Ａ−２（ｎ−１）とおき、（ｍ＋ｎ）トラックではＣ＝Ａ−２ｎとおく。
【００７７】
また、図１３では、ディスク装置における欠陥セクタの管理、処理方式（分散方式）を示した図である。この図で、前記図１２と番号が同じものは同じものである。ここでは、欠陥セクタのための交代領域が同一トラック内に予備交代セクタ、図ではＢ０，Ｂ１（１３１３）が用意されており、トラック内で欠陥セクタがあると、本セクタで置き換える分散方式を使っている。この図では、後発欠陥セクタは、ｓｋｉｐ処理で図示したが、もちろん、セクタの連続のアクセス性能（Ｒｅａｄ／Ｗｒｉｔｅ）を維持するため、ｓｌｉｐ処理で配置するのももちろん構わない。
【００７８】
その他、様々な欠陥セクタ処理方式の例は従来から議論されてきているが、ホスト装置側が、前記実施の形態で説明してきた、例えばコマンドレジスタを使った、装置名称を指定したような手法で、ホスト装置が欠陥セクタ処理方式のどの方式を使うかを、あらかじめホスト装置とディスク装置のやり取りを決めておき、ホスト装置がその欠陥セクタ処理方式を選べるようにすることで、ホスト装置が望む最適なディスク装置のアクセス方式が実現できるようにする。
【００７９】
また、この処理方式も、図に示すようなトラックの範囲ごと、ＺＯＮＥごと、ユーザから見える論理番号範囲ごとなど、ホスト装置とディスク装置間であらかじめ決めた取り決めで指定してももちろん構わない。言い換えれば、ディスク装置には欠陥セクタ方式を選択でき、またその指定も１つのディスク装置において、１種類以上を指定できるようにしたものである。これにより、ディスク装置にホスト装置の望むのに適したディスク装置が実現でき、ホスト装置が使う環境に適した仕様を持ったディスク装置が実現できる。
【００８０】
以上説明してきた例は、具体的な事例を説明するために便宜的に記録再生装置として磁気ディスク装置を念頭において説明してきたものであり、本内容が実現できるなら、光ディスク装置などに適用しても問題はない。
【００８１】
【発明の効果】
以上、本発明によれば、記録再生装置（磁気ディスク装置）からホスト装置へアクセス性能を設定するためのコマンド処理性能パラメータを提示し、ホスト装置はこの提示されたコマンド処理性能パラメータに基づいてコマンド処理性能を指定することにより、ホスト装置は磁気ディスク装置のアクセス性能を制御することができるので、磁気ディスク装置の適用システムに応じた効率的なデータ処理を実現することが可能となる。
【００８２】
さらに、本発明によれば、アクセス性能の提示として、簡易アクセス情報であるアクセス時間の関数情報、またはサポート装置名である機種情報をやり取りするので、記録再生装置（磁気ディスク装置）とホスト装置との間で簡単なパラメータでやり取りが可能である。この手法は、従来のコマンド処理体系で実現するので、ホスト装置、磁気ディスク装置ともに実装は容易である。
【００８３】
さらに、本発明によれば、ホスト装置は、記録再生装置（磁気ディスク装置）からのコマンドごとの応答予想時間を基にホスト動作を制御することで、効率的なシステム動作を実現することが可能となる。
【００８４】
また、本発明によれば、記録再生装置（磁気ディスク装置）固有の情報をやり取りすることで、ホスト装置は記録再生装置（磁気ディスク装置）をある機種として駆動することができ、旧装置のエミュレートも含めたシステム動作も実現することが可能となる。
【００８５】
さらに、本発明によれば、ホスト装置が、欠陥セクタ処理方式を選べるようにすることで、ホスト装置が望む最適な記録再生装置（磁気ディスク装置）のアクセス方式を実現することが可能となる。
【図面の簡単な説明】
【図１】本発明の一実施の形態において、記録再生装置のパラメータ受領方法を示した図である。
【図２】（ａ），（ｂ）は本発明の一実施の形態において、記録再生装置の読み出し時の応答時間を示した図である。
【図３】（ａ），（ｂ）は本発明の一実施の形態において、記録再生装置の書き込み時の応答時間を示した図である。
【図４】本発明の一実施の形態において、記録再生装置の応答時間の様子を示した図である。
【図５】（ａ），（ｂ）は本発明の一実施の形態において、記録再生装置からホスト装置へのホスト装置の受領パラメータを示した図である。
【図６】本発明の一実施の形態において、記録再生装置の応答時間の様子の応答時間関数パラメータの近似を示した図である。
【図７】本発明の一実施の形態において、記録再生装置からホスト装置へのホスト装置の受領パラメータのフォーマットを示した図である。
【図８】本発明の一実施の形態において、ホスト装置から記録再生装置へのパラメータセット方法を示した図である。
【図９】本発明の一実施の形態において、ホスト装置から記録再生装置への応答時間関数パラメータを示した図である。
【図１０】本発明の一実施の形態において、ホスト装置から記録再生装置への記録再生装置の受領応答時間関数設定パラメータのフォーマットを示した図である。
【図１１】本発明の一実施の形態において、記録再生装置の電子回路の構成を示した図である。
【図１２】本発明の一実施の形態において、ディスク装置における欠陥セクタの管理、処理方式（集中方式）を示した図である。
【図１３】本発明の一実施の形態において、ディスク装置における欠陥セクタの管理、処理方式（分散方式）を示した図である。
【符号の説明】
１１０１…Ｒ／Ｗ回路、１１０２…データ処理部、１１０３…ディスクフォーマッタコントロール部、１１０４…ＭＰＵＩ／Ｆコントロール部、１１０５…ＭＰＵ、１１０６…ＥＣＣ処理部、１１０７…バッファコントロール部、１１０８…Ａ／Ｄ変換器、１１０９…データバッファ、１１１０…ホストバスＩ／Ｆコントロール部、１１１１…メカ制御部、１１１２…記録再生装置、１１１３…ホスト装置、１１１４…機構部、１１１５…ＶＣＭ、１１１６…スピンドルモータ、１１１７…Ｄ／Ａ変換器、１１２１…記録媒体、１１２２…ヘッド、１１２３…ＩＤ生成部、１１２４…フラッシュメモリ、１１２５…コマンド終了予想時間生成部、１２０１…記録媒体、１２０２〜１２０４…ＺＯＮＥ、１２０５…ＩＮＤＥＸ、１２０６〜１２１０…トラック、１２１１…初期欠陥セクタ、１２１２…後発欠陥セクタ、１２１３…交代セクタ。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording / reproducing apparatus having a rotary disk-shaped recording medium, and can present / change the performance seen by a user of a recording / reproducing apparatus such as a magnetic disk apparatus (hereinafter, also simply abbreviated to a disk apparatus). It relates to effective technology applied to the method.
[0002]
[Prior art]
According to studies made by the present inventors, the following technology can be considered for a recording / reproducing apparatus having a rotating disk-shaped recording medium.
[0003]
For example, there is a disk device as one of the recording / reproducing devices having a rotating disk-shaped recording medium. In recent years, the size, speed, function, and price of the disk device have been rapidly increasing. In particular, the recording density per unit area of the recording medium is increasing at an annual rate of 1.6 to 2.0 times due to the increase in capacity. For example, the technology currently exceeds 60 Gbits per square inch, and the technology development of 100 Gbits in several years is approaching the practical stage.
[0004]
Also, the medium data transfer rate is increasing at a rate of 1.3 times per year, and accordingly, the I / F data transfer rate, which is the entrance and exit of data of the disk device, does not become a bottleneck in data transfer. In addition, technology development for improving the transfer speed is being performed.
[0005]
In the disk device with such improved performance, a new disk device takes about six months to nine months for general consumers such as PCs, and about one to one and a half years for business use such as servers. Has been developed, and the shipping life (life cycle) of the disk device from the factory is short, one to two years after its release.
[0006]
On the other hand, application devices incorporating disk devices have been widely studied for applications from conventional computers such as PCs and disk array devices to home electric appliances such as hard disk recorders and music players, and some of them have been commercialized. It has become.
[0007]
Under such circumstances, since the life cycle of the disk device is short, if the user newly increases or replaces the disk device, the disk device at the time of initial introduction may not be inserted. In this case, the application device has different performance of the newly introduced disk device, usually high performance. However, this cannot cope with this, and the application device may not be able to exhibit the performance at the time of the initial introduction. Further, when applied to home electric appliances, it is necessary to keep the minimum holding period of the repair performance parts under the guidance of the Ministry of International Trade and Industry, and it is necessary to stock up the disk units.
[0008]
Under such circumstances, there is a solution technique as described below. For example, Patent Literature 1 discloses a control method in which the response time of a connected device is measured and analyzed by an internal counter, and the access time is adjusted for each I / O.
[0009]
Also, the host device is notified of parameters (spindle rotation speed, cache size, etc.) depending on the structure of the connected disk device, and resets the parameters desired by the host device to the disk device so that the desired operation can be performed on the disk device. Patent Document 2 discloses a technique for causing the apparatus to operate.
[0010]
Further, Japanese Patent Application Laid-Open No. H11-163,087 discloses a method in which the host device captures the access performance of a disk device connected to the host device, and the host device determines a command distribution based on the access performance.
[0011]
Further, Patent Document 4 discloses a control method in which a checking device for checking the access performance of a disk device from a host device is used and a command is issued from the host device based on the result.
[0012]
This is supported by the technology described above. Note that the host device described here refers to a device connected to the disk device for giving an instruction to the present disk device and receiving a response from the disk device to the given instruction.
[0013]
[Patent Document 1]
JP 05-101197 A
[0014]
[Patent Document 2]
JP 2001-222380 A
[0015]
[Patent Document 3]
JP-A-11-65775
[0016]
[Patent Document 4]
JP-A-11-167470
[0017]
[Problems to be solved by the invention]
By the way, as a result of the present inventor's study on the technology of the disk device as described above, the following became clear.
[0018]
For example, in the technologies of Patent Documents 1 to 4, in a recording / reproducing apparatus capable of presenting the performance of the recording / reproducing apparatus, parameters (software and version information) that can be controlled from the standpoint of a disk device are disclosed. If the user wants the access time, the host device must calculate the execution time using the parameter obtained from the disk device in consideration of the disk device model, and determine the parameter. Further, when considering the access time, in the disk device, it is necessary to consider the access time difference between writing and reading. This method is not considered in the techniques of Patent Documents 1 to 4.
[0019]
Therefore, an object of the present invention is to solve a method of controlling access performance of a disk device (recording / reproducing device) by a host device by exchanging information specific to the disk device (recording / reproducing device). Further, the control method of the host device is such that it can be simplified by exchanging function information of access time or model information. Further, the host device controls the host operation based on a response from the disk device (recording / reproducing device) to realize an efficient system operation.
[0020]
Further, in the present invention, by exchanging information specific to the disk device (recording / reproducing device), the host device can drive the disk device (recording / reproducing device) as a certain model, including emulation of the old device. The system operation is also realized. Further, by enabling the host device to select a defective sector processing method, it is intended to realize an optimum disk device (recording / reproducing device) access method desired by the host device.
[0021]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes, in a disk device, means for presenting a command processing performance parameter for setting an access performance of the disk device from a recording / reproducing device (disk device) to a host device. Includes means for designating a command processing performance based on a command processing performance parameter (a parameter of the defective sector processing method) presented from the disk device, and the host device uses the specified command processing performance (defective sector processing method) to specify the command processing performance. This makes it possible to control the access performance.
[0022]
Specifically, it has a disk-shaped recording medium, a driving unit for rotating the recording medium, and a head for reading and writing data, and a head driving unit for moving the head to a target position. The present invention is applied to a recording / reproducing device (disk device) composed of a mechanism section and an electronic circuit for reading and writing data on a recording medium by a head, and a recording / reproducing system having the recording / reproducing device. It has.
[0023]
(1) A host device that gives an instruction to a recording / reproducing device obtains a command processing performance parameter from the recording / reproducing device, and based on this, the host device can specify the command processing performance for the recording / reproducing device. Recording / reproducing device with performance presentation / change function.
[0024]
(2) The recording / reproducing apparatus with performance presenting / changing function according to the above (1), wherein the command processing performance is reported by function time data and data transfer speed.
[0025]
(3) The recording / reproducing apparatus with performance presentation / change function according to (1), wherein a parameter of function data of access time is designated as the command processing performance change.
[0026]
(4) The recording / reproducing apparatus with performance presentation / change function according to (2), wherein function data of access time is reported as an approximate function as command processing performance presentation.
[0027]
(5) The recording / reproducing apparatus with performance presentation / change function according to (3), wherein a fixed time to be added to the access time function data is specified as the command processing performance change.
[0028]
(6) The recording / reproducing apparatus with performance presenting / changing function according to (1), wherein, as the command processing performance presentation, a model name capable of realizing the access performance with a conventionally commercialized product is reported.
[0029]
(7) The recording / reproducing apparatus with performance presenting / changing function according to (1), wherein the command processing performance change is designated by a model name capable of realizing the access performance received the performance presentation.
[0030]
(8) The host device that gives an instruction to the recording / reproducing device obtains the expected command processing end time for the command for which the instruction is given from the recording / reproducing device, and the host device controls the processing procedure based on this. Recording / playback device with performance presentation.
[0031]
(9) A recording / reproducing apparatus with a performance presenting / changing function according to any one of (1) to (8), wherein a data controller electronic circuit characterized by realizing such a function is mounted.
[0032]
(10) Two or more recording / reproducing devices are connected to a host device for giving instructions to the recording / reproducing devices. The recording / reproducing device obtains command processing performance parameters from each recording / reproducing device, When the device specifies command processing performance for each recording / reproducing device, the device realizes a hierarchical structure of the recording / reproducing device by specifying the command processing performance difference between the recording / reproducing devices. A recording / reproducing system using a recording / reproducing device with a presentation / change function.
[0033]
(11) The recording / reproducing apparatus with performance presenting / changing function according to (2), wherein the function data of the access time is reported separately for writing and reading as command processing performance presentation.
[0034]
(12) The recording / reproducing apparatus with performance presenting / changing function according to (3), wherein the parameter of the access time function data is specified separately for writing and reading as the command processing performance change.
[0035]
(13) The host device that gives an instruction to the recording / reproducing device receives a report of the model name that can be realized by a product that has been commercialized from the recording / reproducing device, and based on this, the host device sends a model name to the recording / reproducing device. A recording / reproducing apparatus with a performance presenting / changing function, wherein a name is designated and the storage / reproducing apparatus performs the same movement as the designated model name from the viewpoint of the host apparatus.
[0036]
(14) With respect to the defective sector processing method for setting the access performance, the host device which gives an instruction to the recording / reproducing device obtains the parameter of the defective sector processing method from the recording / reproducing device, and based on this, the host device A recording / reproducing apparatus with a method presenting / changing function, wherein a defective sector processing method can be designated for the recording / reproducing apparatus.
[0037]
(15) In a recording / reproducing apparatus employing a disk device, a host device that gives an instruction to the disk device obtains a command processing performance parameter from the disk device, and based on the command processing performance parameter, the host device sends a command processing parameter to the disk device. A method of controlling a disk device, wherein command processing performance can be specified.
[0038]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings for describing the embodiments, the same members are denoted by the same reference numerals, and a repeated description thereof will be omitted.
[0039]
In the embodiment of the present invention, a recording / reproducing apparatus using a magnetic disk device as the recording / reproducing apparatus will be described in detail with reference to FIGS. In the present embodiment, as a specific example, an ATA specification which is a standard interface for PCs is disclosed in an easy-to-understand manner, but the present invention is not limited to ATA. Of course, the same function can be realized by another interface.
[0040]
FIG. 1 shows a method for receiving a parameter for access performance from a disk device to which a host device is connected. Here, a case is considered in which n disk devices (Drive 1 to Driven) are connected to one host device (PC / WS). This means that the host device issues IDENTIFY DEVICE commands 101, 103, and 105 indicating a parameter request to the disk device, thereby obtaining 256 Word reception parameters 102, 104, and 106 that are return values of the ATA IDENTIFY DEVICE command. I do. In this return value, information indicating the performance parameter of the device is defined in an unused area as a Vender unique value. As described above, the performance parameters of the disk device can be passed to the host device.
[0041]
FIG. 2 shows the response time of the disk device at the time of reading when considering the performance parameters of the disk device. At the time of reading (Read), the response time depends on whether the data requested by the host device is stored in the cache mounted on the disk device (called cache hit) or not stored (no cache hit). different. (A) shows a case without cache hit, and (b) shows a case with cache hit. Hereinafter, details of the response time will be described.
[0042]
The command issued from the host device interprets what the command content is in the disk device and determines what to do. This is the time of the command overhead 201. Next, when it is necessary to read data from the recording medium by a read command based on the command interpretation result, the head is moved. This is the head movement time 204.
[0043]
After the head moves, the time until the head of the target data sector arrives is the rotation waiting time 205. Here, the head movement time 204 + the rotation waiting time 205 is collectively referred to as the access time 202. Further, the time required to read the relevant data from the recording medium and transfer it to the host device is a read time 203. In the case of cache hit, the access time becomes unnecessary, and only the data transfer time 206 to the host device is required, so that a high-speed response time is obtained as shown in the figure.
[0044]
Similarly, FIG. 3 shows the response time of the disk device at the time of writing. At the time of writing (Write), the command issued from the host device is interpreted by the disk device as to what the command content is and judges what to do. This is the time of the command overhead 301. Next, writing is performed based on the command interpretation result, and the head is moved to write data to the recording medium. This is the head movement time 304.
[0045]
After the head moves, the time until the head of the target data sector arrives is the rotation waiting time 305. Here, the head movement time 304 + the rotation waiting time 305 is collectively referred to as the access time 302. During the movement of the head, data in the cache of the disk device is sent from the host device. This is the host transfer time 306, which is a parallel process with writing on the recording medium. When the head reaches the target sector, the data from the host device stored in the cache in the disk device is written to the recording medium. This is the writing time 303.
[0046]
Normally, after the writing of the recording medium is completed, an end report is made to the host device (this is referred to as no delay writing). Since the data bus between the disk devices is open, there is also a method in which the disk device reports the end to the host device at this time (there is a delay write). This makes it possible to improve the apparent response time of the disk device. Which of these operations is performed by the disk device can be performed by a host device setting the disk device, for example, by using a Set Feature command.
[0047]
Here, when considering the response time of delayed writing, even if a command end response is received, processing is still being performed in the disk device, and when commands are sent one after another, cache overflows and the response time may fluctuate. However, it is necessary for the host device to understand. The above is the concept of the response time of the disk device.
[0048]
FIG. 4 shows the response time when a command is issued from the host device of the disk device. In this figure, the horizontal axis indicates the moving distance (the number of moving sectors) from the current position of the head, and the vertical axis indicates the transfer time, showing an image of the relationship between the response times. Here, the number of transfer sectors is a fixed value. If this is one sector, it can be considered that the access time and the response time are almost equal. From this, the rotation waiting time 403 can be seen when the number of moving sectors is scarce, but as the number of moving sectors increases, the access time of the head becomes visible, as shown in the figure.
[0049]
Here, the access time of the disk device has an ideal response time 401 and a fluctuation region 402 in which the value varies. The reason why this value varies may be due to factors such as a head access error, a non-detection of the corresponding sector, and an error correction failure. This is the reason why the response time of the disk device varies. Also, this time differs between writing and reading. Also, it varies with cache on / off and with / without delayed writing.
[0050]
FIG. 5A shows response performance parameters received from the disk device by the host device based on the concept of the response time of the disk device so far. This is because, as shown in FIG. 4, the IDENTIFY DEVICE command shown in FIG. 1 can be sent to the host device with the parameter represented by the response time function 501 as information necessary to represent the response time of the disk device. Just fine. Here, as an example of the response time function, the transfer speed A, the rotation waiting time B, and the access times fw (s) and fr (s) for writing and reading are sent. Of course, the cache described in FIG. On / off, with / without delayed writing may all be sent, or parameters matching the current operating environment conditions of the disk device may be sent.
[0051]
Alternatively, as shown in FIG. 5B, the format name of the conventionally manufactured disk device (that is, the supported disk device model names DriveA to DriveZ) which can be realized by the present disk device is transmitted as a parameter. But of course it doesn't matter.
[0052]
Here, the form of the function of the access time used for the write fw (s) and the read fr (s) may be, of course, parameter information of the following formula generally used in the art. Note that α: fixed value (unit: time), β, γ: coefficient, and S: number of moving sectors.
[0053]
(Equation 1)

[0054]
Further, parameters may be separately provided as needed for writing and reading, as a matter of course. As described above, the command processing performance parameter of the disk device can be received.
[0055]
FIG. 6 shows a method of approximating the response time function parameter by a simple expression, and FIG. 7 shows an example of the format of the parameter passed to the host device at that time. In FIG. 6, the response time function is approximated by two linear functions. In FIG. 6, a function 601 of f1 (s) = A1 × S + B1 and a function of f2 (s) = A2 × (S−S1) + B2 are divided at the boundary of the number of moving sectors S1. A1 and A2 indicate the inclination, S and (S-S1) indicate the moving sector range, and B1 and B2 indicate the overhead.
[0056]
FIG. 7 shows the format of the parameters provided specifically to the host device. This format, which becomes the reception parameter 701 of the host device, stores information that becomes the parameter 702 of the response time function. In FIG. 7, functions for writing and reading are separated, and as shown in FIG. 6, one response time function is approximated by two linear functions, so four function parameters are required. . That is, for Write, the moving sector ranges Sw1, Sw2, overhead Bw1, Bw2, and inclinations Aw1, Aw2 are required, and for Read, the moving sector ranges Sr1, Sr2, overhead Br1, Br2, and inclinations Ar1, Ar2 are required.
[0057]
Further, the media transfer rate and the number of stored bytes are used. The storage byte indicates the number of storage bytes of the response time function parameter 702. Here, the function representing the response time function was approximated by a linear function, but the present embodiment has shown that a function TYPE can be selected as a function parameter so that a quadratic function or more can be used. Of course, the format may be changed from the agreement between the host device and the disk device for sending and receiving the performance parameters. As described above, the performance parameters of the disk device can be easily provided to the host device.
[0058]
FIG. 8 shows a method of setting parameters in the disk device based on the performance parameters provided so far from the disk device. This is performed by parameter setting requests 801, 802, 803 from the host device. In the case of an ATA command, the setting may be performed using parameters of the SETTEATURES command and the task register. FIG. 9 shows a format example of a parameter set in the task register.
[0059]
It follows the taskregister configuration parameters 901 according to the SET FEATURES command format. First, an access performance set code is allocated to a Subcommand code to a currently unused number, and the set code (Sector Count, Sector Number, Cylinder Low, Cylinder High, Device / Head) is determined for each Subcode. . Here, after setting the function parameters (Bw1 ', Bw2', Br1 ', Br2') and the code specifying the device name (Drive C) as shown in the figure, and writing the Set Feature command code FEh in the command register, Good.
[0060]
In particular, when specified by the device name, the disk device may perform the same operation as viewed from the host device. By doing so, when this disk device is mounted on the applicable device, it can be used with the specifications of the applied device, and even if the life cycle is over and the disk device at that time is not available, It can be mounted on the device. Of course, if it is possible to specify what device specification of the disk device should be operated without changing the specifications of the disk device by using a command, for example, a jumper on the disk device, etc., there is no problem.
[0061]
FIG. 10 shows a format example for setting the response time function setting parameters. In this case, the response time function parameter 1002 is changed from the reception parameter 1001 received from the disk device shown in FIG. 7 to the response time desired by the host device (moving sector ranges Sw1 ', Sw2' for Write, overhead). Bw1 ', Bw2', inclinations Aw1 ', Aw2', and for Read use the moving sector ranges Sr1 ', Sr2', overheads Br1 ', Br2', and inclinations Ar1 ', Ar2'). In this case, a dedicated command for setting this parameter in the disk device may be provided.
[0062]
Instead of setting all function parameters, only the function overhead may be set and the response time function may be linearly moved in the Y-axis direction. Of course, if a similar function can be realized, the method shown in FIGS. In this way, the disk device can indicate the access performance desired by the host device by the function indicating the access performance newly set by the host device in the disk device.
[0063]
FIG. 11 shows a configuration of an electronic circuit of a recording / reproducing apparatus employing the magnetic disk device described above. The electronic circuit of the recording / reproducing apparatus 1112 includes an R / W circuit 1101, a disk formatter control unit (DF) 1103, an MPU / F control unit 1104, an ECC processing unit 1106, a buffer control unit (BM) 1107, and a host bus I / F. A data processing unit 1102 including a control unit (HBI) 1110, an ID generation unit 1123, and an expected command end time generation unit 1125, an MPU 1105, a data buffer 1109, a mechanical control unit including an A / D converter 1108 and a D / A converter 1117. 1111 and a flash memory (FLASH) 1124. A host device 1113 is connected to the host bus I / F control unit 1110, and a mechanism unit 1114 is connected to the R / W circuit 1101.
[0064]
The operation of the recording / reproducing device 1112 will be described with reference to a standard data write operation. Here, it is assumed that the recording / reproducing device 1112 and the host device 1113 are connected via a standard interface.
[0065]
First, the host device 1113 extracts the access performance information stored in the recording / reproducing device 1112, and grasps the access performance. At this time, a conventional product number supported as the recording / reproducing device 1112 may be used. As a result, the host device 1113 may set the access performance parameter of the disk device by examining what performance is desired for the disk device.
[0066]
Thereafter, an instruction to write data is sent from the host device 1113 to the recording / reproducing device 1112 according to the interface protocol. The command transferred to the recording / reproducing device 1112 is received by the HBI 1110 in the data processing unit 1102 of the recording / reproducing device, and then sent to the MPU 1105, where the command is interpreted. As a result, the MPU 1105 turns out to be an instruction to write data in the corresponding sector of the drive. Further, when the MPU 1105 determines that the data is to be written, the MPU 1105 starts the write preparation work of the corresponding sector instructed by the host device 1113.
[0067]
In the recording / reproducing apparatus 1112, the mechanism unit 1114 includes a recording medium 1121, a head 1122, a VCM (Voice Coil Motor) 1115 for driving the head, a spindle motor 1116 for rotating the recording medium, and the like. An instruction is issued from the MPU 1105 to the mechanical control unit 1111 so that the mechanism unit 1114 can write data in the corresponding sector.
[0068]
Then, the mechanical control unit 1111 instructs the motor driver based on the position signal from the R / W circuit 1101 to control the mechanism unit 1114, and positions the head 1122 on the corresponding track of the recording medium 1121. During this time, write data is temporarily stored in the data buffer 1109 from the HBI 1110 via the BM 1107 between the host device 1113 and the HBI 1110 according to the protocol.
[0069]
Further, for positioning of the head 1122, the data of the servo area read from the recording medium 1121 is taken into the ID generation unit 1123 as serial pulse data via the R / W circuit 1101. At this time, byte sync detection is performed, and based on this, serial-parallel conversion is performed.
[0070]
Here, if the servo ID is correctly read, the physical sector number is calculated from this value, the logical number after the defect processing is calculated, and the logical sector number is passed to the drive I / F control unit. As a result, after judging whether the sector is the relevant sector, in the case of the desired sector, data writing is performed, and the R / W circuit 1101 converts the NRZ (Non Return to Zero) signal into an analog signal. This signal is written on the recording medium 1121.
[0071]
At this time, the write data is written from the data buffer 1109 via the DF 1103. Here, the ECC processing unit 1106 adds an ECC code capable of checking and correcting the data when reading the medium in units of sectors. The ID generation unit 1123 determines whether or not the write sector should be subjected to the slip processing in the later defective sector. This can be achieved by utilizing the defective sector processing of the recording / reproducing apparatus, which is a conventional technique. Reading may be performed in the reverse order.
[0072]
Here, data writing was performed after the access performance of the disk device was specified by the host device 1113. However, when a command was issued from the host device, a command end expected time generation unit 1125 was provided to execute the command. When the host device receives the command, the host device may perform a method of controlling access to the disk device by receiving it.
[0073]
Further, when a plurality of disk devices are connected to the host device as shown in FIG. 1, a difference in the access performance of each disk device is provided, and the access performance of the disk device is set to perform recording. Of course, a hierarchical structure of the devices can be created, and an efficient recording device system can be created.
[0074]
FIG. 12 is a diagram showing a management and processing method (centralized method) of the defective sector in the disk device. This is a location on the recording medium 1201 where three sectors have different numbers of sectors per track, which are generally called ZONE. There are ZONE0 (1202), ZONE1 (1203), and ZONE2 (1204). Here, paying attention to ZONE1, a case where n + 1 tracks exist in A + 1 sectors per track will be described.
[0075]
As shown in the figure, the beginning of the track is referred to as INDEX 1205, and the track having this is shown from m track 1206 to (m + n) track 1210. For example, when HEAD = 0, the m track 1206 has a cylinder number = m and a head number = 0. Also, after moving the head when the head moves to an adjacent track (here, 1206 → 1207 or the like) where the track number increases, the sector number is shifted so that the head sector of the head of the next track comes (this is called skew). ) And this is described as skew = 2.
[0076]
In the disk device, there are an initial defective sector indicating a sector position unsuitable for reading and writing detected before shipment from the factory, and a later defective sector which is information on a defective sector generated after shipment from the factory. As shown in the figure, the use of this sector includes a slip process for the initial defective sector 1211 and a skip process for the late defective sector 1212. In the subsequent defect processing, a spare area, which is a replacement sector 1213 of the (m + n-1) track 1209 to the (m + n) track 1210, is used in the drawing. For example, in the (m + n-1) track, B = A-2 (n-1), and in the (m + n) track, C = A-2n.
[0077]
FIG. 13 is a diagram showing a management and processing method (distribution method) of defective sectors in the disk device. In this figure, those having the same numbers as those in FIG. 12 are the same. In this case, a spare area for defective sectors is provided in the same track as spare spare sectors, B0 and B1 (1313) in the figure. ing. In this figure, the late defective sector is illustrated by the skip processing, but of course, it may be arranged by the slip processing in order to maintain the continuous access performance (Read / Write) of the sector.
[0078]
In addition, although various examples of the defective sector processing method have been discussed in the past, the host device side has been described in the above embodiment, for example, using a command register, a method of designating the device name, The exchange between the host device and the disk device is determined in advance for the host device to use which of the defective sector processing methods, and by allowing the host device to select the defective sector processing method, the optimum desired by the host device is determined. An access method for a disk device can be realized.
[0079]
Also, this processing method may be specified by a predetermined agreement between the host device and the disk device, such as for each track range, each ZONE, and each logical number range seen by the user as shown in the figure. In other words, the defective sector method can be selected for the disk device, and one or more types can be specified in one disk device. As a result, a disk device suitable for the host device can be realized as the disk device, and a disk device having specifications suitable for the environment used by the host device can be realized.
[0080]
In the example described above, a magnetic disk device has been described as a recording / reproducing device for the sake of convenience in describing a specific case, and if this content can be realized, the present invention is applied to an optical disk device or the like. No problem.
[0081]
【The invention's effect】
As described above, according to the present invention, a command processing performance parameter for setting access performance from a recording / reproducing device (magnetic disk device) to a host device is presented, and the host device issues a command based on the presented command processing performance parameter. By specifying the processing performance, the host device can control the access performance of the magnetic disk device, so that efficient data processing according to the system to which the magnetic disk device is applied can be realized.
[0082]
Further, according to the present invention, as the presentation of the access performance, the function information of the access time as the simple access information or the model information as the support device name is exchanged, so that the recording / reproducing device (magnetic disk device) and the host device are exchanged. Can be exchanged with simple parameters. Since this method is realized by a conventional command processing system, it is easy to mount both the host device and the magnetic disk device.
[0083]
Further, according to the present invention, the host device can realize an efficient system operation by controlling the host operation based on the expected response time for each command from the recording / reproducing device (magnetic disk device). It becomes.
[0084]
Further, according to the present invention, by exchanging information specific to the recording / reproducing device (magnetic disk device), the host device can drive the recording / reproducing device (magnetic disk device) as a certain model, and emulate the old device. It is also possible to realize the system operation including the rate.
[0085]
Further, according to the present invention, by enabling the host device to select a defective sector processing method, it becomes possible to realize an optimum access method of the recording / reproducing device (magnetic disk device) desired by the host device.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a parameter receiving method of a recording / reproducing apparatus according to an embodiment of the present invention.
FIGS. 2A and 2B are diagrams showing response times at the time of reading of a recording / reproducing apparatus according to an embodiment of the present invention.
FIGS. 3A and 3B are diagrams showing response times at the time of writing of the recording / reproducing apparatus in one embodiment of the present invention.
FIG. 4 is a diagram showing a response time of a recording / reproducing apparatus according to an embodiment of the present invention.
FIGS. 5A and 5B are diagrams showing reception parameters of the host device from the recording / reproducing device to the host device in the embodiment of the present invention.
FIG. 6 is a diagram showing an approximation of a response time function parameter of a response time of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 7 is a diagram showing a format of a reception parameter of the host device from the recording / reproducing device to the host device in one embodiment of the present invention.
FIG. 8 is a diagram showing a parameter setting method from a host device to a recording / reproducing device in one embodiment of the present invention.
FIG. 9 is a diagram showing response time function parameters from the host device to the recording / reproducing device in one embodiment of the present invention.
FIG. 10 is a diagram showing a format of a reception response time function setting parameter of the recording / reproducing device from the host device to the recording / reproducing device in the embodiment of the present invention.
FIG. 11 is a diagram showing a configuration of an electronic circuit of the recording / reproducing device in one embodiment of the present invention.
FIG. 12 is a diagram showing a management and processing method (centralized method) of defective sectors in a disk device according to an embodiment of the present invention.
FIG. 13 is a diagram showing a management and processing method (distribution method) of a defective sector in a disk device according to an embodiment of the present invention.
[Explanation of symbols]
1101 R / W circuit 1102 Data processing unit 1103 Disk formatter control unit 1104 MPU / F control unit 1105 MPU 1106 ECC processing unit 1107 Buffer control unit 1108 A / D conversion Device, 1109 data buffer, 1110 host bus I / F control unit, 1111 mechanical control unit, 1112 recording / reproducing device, 1113 host device, 1114 mechanism unit, 1115 VCM, 1116 spindle motor, 1117 D / A converter, 1211, recording medium, 1122, head, 1123, ID generation unit, 1124, flash memory, 1125, command expected time generation unit, 1201, recording medium, 1202 to 1204, ZONE, 1205 INDEX, 1206-12 0 ... track, 1211 ... initial defective sectors, 1212 ... subsequent defective sector, 1213 ... alternate sector.

Claims (7)

A disk drive, a drive unit for rotating the recording medium, and a head for reading and writing data to and from the recording medium; and a head drive for moving the head to a target position. A recording / reproducing apparatus including a mechanical unit including a unit and an electronic circuit for implementing reading and writing of data with the head on the recording medium,
Means for presenting a command processing performance parameter for setting the access performance of the recording / reproducing device to an external host device,
A recording / reproducing apparatus controlled by command processing performance specified based on the command processing performance parameter presented to the host device. A disk drive, a drive unit for rotating the recording medium, and a head for reading and writing data to and from the recording medium; and a head drive for moving the head to a target position. Recording / reproducing apparatus, comprising: a mechanical unit comprising: a unit; an electronic circuit for implementing reading and writing of data by the head on the recording medium; and means for externally presenting a command processing performance parameter for setting access performance. When,
A host device that is connected to the outside of the recording / reproducing apparatus and includes a unit that specifies a command processing performance based on a command processing performance parameter presented from the unit; and a host device that controls the recording / reproducing apparatus with the specified command processing performance. A recording / reproducing system comprising: The recording / reproducing system according to claim 2,
The recording / reproducing device is composed of a plurality of devices, and the plurality of recording / reproducing devices are connected in parallel to the host device,
In the case where the host device specifies the command processing performance for each of the plurality of recording / reproducing devices, the host device specifies the command processing performance of each of the recording / reproducing devices with a difference, thereby specifying the hierarchical structure of the recording / reproducing device. A recording / reproducing system which realizes the following. A disk drive, a drive unit for rotating the recording medium, and a head for reading and writing data to and from the recording medium; and a head drive for moving the head to a target position. A method for controlling a magnetic disk drive, comprising: a mechanical unit comprising: a unit; and an electronic circuit for reading and writing data on the recording medium with the head.
The magnetic disk device presents a command processing performance parameter for setting the access performance of the magnetic disk device to an external host device, and the host device specifies the command processing performance based on the presented command processing performance parameter. And controlling the magnetic disk device with the specified command processing performance. 5. The control method for a magnetic disk drive according to claim 4,
The method for controlling a magnetic disk drive according to claim 1, wherein the command processing performance specifies function information of access time or model information. The method of controlling a magnetic disk drive according to claim 5,
The function information fn (s) indicating the access time includes a time conversion coefficient An (time / sector) corresponding to the number of moving sectors, Sn as the number of moving sectors, and an overhead time inside the magnetic disk irrespective of the number of moving sectors. Is represented by fn (s) = An × Sn + Bn, where An and Bn are designated for the magnetic disk device separately for writing and reading, and a method for controlling the magnetic disk device. A disk drive, a drive unit for rotating the recording medium, and a head for reading and writing data to and from the recording medium; and a head drive for moving the head to a target position. A method for controlling a magnetic disk drive, comprising: a mechanical unit comprising: a unit; and an electronic circuit for reading and writing data on the recording medium with the head.
The magnetic disk device presents a parameter of a defective sector processing method for setting the access performance of the magnetic disk device to an external host device, and the host device determines a defect based on the presented parameter of the defective sector processing method. A method for controlling a magnetic disk drive, wherein a sector processing method is designated and the magnetic disk drive is controlled by the designated defective sector processing method.

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