JPS63281202A - Magnetic disk device - Google Patents
Magnetic disk deviceInfo
- Publication number
- JPS63281202A JPS63281202A JP11781387A JP11781387A JPS63281202A JP S63281202 A JPS63281202 A JP S63281202A JP 11781387 A JP11781387 A JP 11781387A JP 11781387 A JP11781387 A JP 11781387A JP S63281202 A JPS63281202 A JP S63281202A
- Authority
- JP
- Japan
- Prior art keywords
- head address
- head
- address
- magnetic disk
- disk device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007547 defect Effects 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁気ディスク装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic disk device.
従来の従来の磁気ディスク装置は物理ヘッドアドレスと
論理ヘッドアドレスが同一である。また、一般に磁気デ
ィスク装置ではシステムプログラム等を格納するシリン
ダーアドレスが“０″でヘッドアドレスが“０”のシス
テムエリアには媒体欠陥が存在しないことになっていた
。In conventional magnetic disk devices, the physical head address and the logical head address are the same. Furthermore, in general, in magnetic disk drives, there are no media defects in the system area where the cylinder address is "0" and the head address is "0", where system programs and the like are stored.
上述した従来の磁気ディスク装置はシステムエリアに媒
体欠陥が存在しないことが前提になっているので、磁気
ディスク装置の製造中又は使用中においてシステムエリ
アとして使用するシリンダーアドレスが“０′でヘッド
アドレスが“０°′のエリアに媒体欠陥が発生した場合
、その磁気ディスク装置が使えなくなるという欠点があ
る。The conventional magnetic disk drive described above is based on the assumption that there are no media defects in the system area, so during manufacturing or use of the magnetic disk drive, the cylinder address used as the system area is "0" and the head address is If a medium defect occurs in the "0°" area, there is a drawback that the magnetic disk device becomes unusable.
本発明の磁気ディスク装置は、物理ヘッドアドレスと論
理ヘッドアドレスの対応を切替えることができる交換回
路を含んで構成される。The magnetic disk device of the present invention includes a switching circuit that can switch the correspondence between physical head addresses and logical head addresses.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。ヘッド
アドレスレジスター１はコントローラから送られてきた
論理ヘッドアドレスを保持するレジスターで、ヘッドア
ドレス交換回路２はヘッドアドレスレジスター１の論理
ヘッドアドレスを物理ヘッドアドレスに変換する。ヘッ
ド選択回路３はヘッドアドレス変換回路２で変換された
物理ヘッドアドレスにより磁気ディスクにデータのライ
ト、リードを行う磁気ヘッド４を選択する。FIG. 1 is a block diagram of one embodiment of the present invention. The head address register 1 is a register that holds the logical head address sent from the controller, and the head address exchange circuit 2 converts the logical head address in the head address register 1 into a physical head address. The head selection circuit 3 selects the magnetic head 4 that writes and reads data on the magnetic disk based on the physical head address converted by the head address conversion circuit 2.
シリンダーアドレスが“０°“のエリアにおいてヘッド
アドレスが“０′′の部分に媒体欠陥が存在し、他のヘ
ッドたとえばヘッドアドレスが“４ｎの部分には媒体欠
陥が無い場合、ヘッドアドレス変換回路２によりヘッド
アドレス゛０′°と“４′。In the area where the cylinder address is "0°", if there is a medium defect in the part with the head address "0" and there is no media defect in the part with the head address "4n" in other heads, for example, the head address conversion circuit 2 Therefore, the head address ゛0'° and ``4''.
とを切替えることにより、すなわち、論理ヘッドアドレ
ス“０°゛を物理ヘッドアドレス“４″に変換し、論理
ヘッドアドレス“４”を物理ヘッドアドレス“０“に変
換することにより、論理的にヘッドアドレスが“０”の
部分には媒体欠陥が存在せず、ヘッドアドレスが“４′
′の部分に媒体欠陥が存在することになり、媒体欠陥を
シリンダーアドレスが“Ｏ′°でヘッドアドレスが“０
”のシステムエリアから退避させることができる。In other words, by converting the logical head address "0°" to the physical head address "4" and converting the logical head address "4" to the physical head address "0", the head address is logically changed. There is no media defect in the part where is “0” and the head address is “4’”.
There is a media defect in the part ', and the media defect is identified by the cylinder address being "O'° and the head address being "0'.
” can be evacuated from the system area.
〔発明の効果〕
以上説明したように本発明は、媒体欠陥の存在するヘッ
ドと媒体欠陥が無いヘッドとのヘッドアドレスを変換す
ることにより、ヘッドアドレスを変換しなければシステ
ムエリアとなるべきエリアに媒体欠陥が存在しても、そ
の、媒体欠陥をシステムエリアから退避させてシステム
エリアに媒体欠陥の無い磁気ディスク装置として使用す
ることができる効果がある。[Effects of the Invention] As explained above, the present invention converts the head addresses of a head with a medium defect and a head without a medium defect, thereby allowing an area that would otherwise be a system area to be converted into a system area. Even if a medium defect exists, the medium defect can be evacuated from the system area and the magnetic disk device can be used as a magnetic disk device with no medium defect in the system area.
第１図は本発明の一実施例の主要部分のブロック図であ
る。
１・・・ヘッドアドレスレジスター、２・・・ヘッドア
ドレス変換回路、３・・・ヘッド選択回路、４・・・磁
気ヘッド。FIG. 1 is a block diagram of the main parts of an embodiment of the present invention. 1...Head address register, 2...Head address conversion circuit, 3...Head selection circuit, 4...Magnetic head.
Claims (1)
えることができる交換回路を含むことを特徴とする磁気
ディスク装置。A magnetic disk device characterized by including a switching circuit capable of switching correspondence between physical head addresses and logical head addresses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11781387A JPS63281202A (en) | 1987-05-13 | 1987-05-13 | Magnetic disk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11781387A JPS63281202A (en) | 1987-05-13 | 1987-05-13 | Magnetic disk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63281202A true JPS63281202A (en) | 1988-11-17 |
Family
ID=14720897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11781387A Pending JPS63281202A (en) | 1987-05-13 | 1987-05-13 | Magnetic disk device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63281202A (en) |
-
1987
- 1987-05-13 JP JP11781387A patent/JPS63281202A/en active Pending
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