JPS63119079A - Test method for magnetic disk - Google Patents
Test method for magnetic diskInfo
- Publication number
- JPS63119079A JPS63119079A JP26424886A JP26424886A JPS63119079A JP S63119079 A JPS63119079 A JP S63119079A JP 26424886 A JP26424886 A JP 26424886A JP 26424886 A JP26424886 A JP 26424886A JP S63119079 A JPS63119079 A JP S63119079A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disk
- magnetic
- magnetic head
- disk
- durability
- 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
- 238000010998 test method Methods 0.000 title description 7
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 230000007423 decrease Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/10—Indicating arrangements; Warning arrangements
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の試験方法、特に磁気ディスクの
記録面の機械的強度の試験方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for testing a magnetic disk, and particularly to a method for testing the mechanical strength of a recording surface of a magnetic disk.
磁気ディスク、特に磁気記録面の機械的強度を評価する
には、実際の磁気ヘッド及び磁気ディスク全周いて試験
することが不可欠である。In order to evaluate the mechanical strength of a magnetic disk, especially the magnetic recording surface, it is essential to test the entire circumference of the actual magnetic head and magnetic disk.
従来、磁気ディスクの耐久性全評価する場合、！ｌ！際
の使われ方と同様の方法のコンタクト・スタート・スト
ップ全数万回繰シ返して行ない、試験後の磁気ディスク
面の損傷、書き込んだ出力低下の程度、磁気ヘッド−磁
気ディスク間の摩擦係数の変化全観察していた。この方
法は、現実の使用方法に最も近い優れた試験方法である
が、数万回のコンタクト・スタート・ストップ（以下Ｃ
８Ｓと呼ぶ）全行なうのに数日〜上敷日の期間全必要と
した。Conventionally, when evaluating the entire durability of magnetic disks,! l! The contact start/stop procedure was repeated tens of thousands of times using the same method used in the actual test, and the damage to the magnetic disk surface, the degree of decrease in written output, and the coefficient of friction between the magnetic head and magnetic disk were determined after the test. I was observing all the changes. This method is an excellent test method that is closest to the actual usage method, but it requires tens of thousands of contact start-stops (C
(referred to as 8S) It took a few days to a few days to complete the entire process.
磁気ディスクの耐久性全短期間に、加速的に行なう方法
として、磁気ヘッドに荷重をかけ之シ、磁気ディスクの
回転数上置えたシ、回転する磁気ディスクの記録面に磁
気ヘッドを傾斜させて磁気ヘッドのエッヂ上当てたシ、
（特開昭６０−２！Ｍ５２０）磁気ディスクと磁気ヘッ
ド間に硬度の高い微粒子を付着せしめ回転させる方法（
特開昭６Ｏ−１８２５１８）などが考案されてい九上記
方法はいずれも短期間で可能な方法であるが、測定結果
として、バラツキが大きく、又実際の使われ方と違うた
め、上記測定による結果とＣ８Ｓ試験方法による結果が
必らずしも一致しないという問題があった。又、磁気デ
ィスクの損傷、磁気ディスクの出力波などの評価はでき
ても、磁気ディスク−磁気ヘッド間の摩擦係数の変化は
追えず、実際のドライブとして組んでＣＢＳ’ｉ行なう
と、摩擦係数の増加によυスピンドルモーターがロック
されるという状態を評価判定できなかった。As a method of accelerating the durability of a magnetic disk in a short period of time, it is possible to apply a load to the magnetic head, place it above the rotational speed of the magnetic disk, and tilt the magnetic head to the recording surface of the rotating magnetic disk. Place it on the edge of the magnetic head,
(Unexamined Japanese Patent Publication No. 60-2! M520) A method of attaching hard particles between a magnetic disk and a magnetic head and rotating the disk (
All of the above methods are methods that can be done in a short period of time, but the measurement results vary greatly and are different from the actual usage, so the results from the above measurements are There was a problem that the results obtained by the C8S test method and the C8S test method did not necessarily match. Furthermore, although it is possible to evaluate damage to the magnetic disk and output waves of the magnetic disk, it is not possible to track changes in the coefficient of friction between the magnetic disk and the magnetic head. It was not possible to evaluate and determine the state in which the υ spindle motor was locked due to the increase.
上述の如く従来技術では、短期間に実際に近い使われ方
をした場合の磁気ディスクの機械的耐久性を評価できな
いという問題点を有していた。As described above, the conventional technology has a problem in that it is not possible to evaluate the mechanical durability of a magnetic disk when it is used in a manner similar to actual use for a short period of time.
そこで本発明はこの様な問題点を解決するもので、その
目的とするところは、短期間に再現性よく、ＣＢＳ試験
方法と同様の結果が出る試験方法を提供することである
。The present invention is intended to solve these problems, and its purpose is to provide a test method that can produce results similar to those of the CBS test method with good reproducibility in a short period of time.
本発明の磁気ディスクの試叡方法は、磁気ディスク全磁
気ヘッドが浮上する方向に回転させ、次に逆方向に定速
で一定時間回転させることによって、磁気ディスクの耐
久性を評価すること全特徴とする。The magnetic disk testing method of the present invention evaluates the durability of a magnetic disk by rotating the magnetic disk in a direction in which the entire magnetic head floats, and then rotating it in the opposite direction at a constant speed for a certain period of time. shall be.
本発明の試験方法は、まず磁気ディスクラ磁気ヘッドが
浮上する方向に２０００〜５６００ ｒｐｍで回転させ
、磁気ヘッド全完全浮上させる。次に磁気ディスク全完
全に停止させ、磁気ヘッドを磁気ディスク面に着陸させ
る。これで１回のＣ８８を行なったこととなる。次に磁
気ディスク金逆方向に６０〜１００ ｒｐｍに回転させ
る。このとき回転数が低いため、磁気ディスクと磁気ヘ
ッドは接触したまま移動し、磁気ヘッドのギャップがあ
るリーディング部が先頭とな９機械的ダメージを受ける
。これらの順序で１００〜２００回程度繰シ返し行ない
、試験前後の磁気ディスクの損傷、磁気ディスクの出力
低下、摩擦係数の増減を測定し、評価する。In the test method of the present invention, first, the magnetic disk head is rotated at 2000 to 5600 rpm in the direction in which the magnetic head floats, so that the entire magnetic head is completely floated. Next, the magnetic disk is completely stopped and the magnetic head is landed on the magnetic disk surface. This means that C88 has been performed once. Next, the magnetic disk is rotated in the opposite direction at 60 to 100 rpm. At this time, since the rotational speed is low, the magnetic disk and the magnetic head move while being in contact with each other, and the leading portion of the magnetic head, where there is a gap, is at the beginning and suffers mechanical damage. The test is repeated approximately 100 to 200 times in this order, and damage to the magnetic disk before and after the test, a decrease in the output of the magnetic disk, and an increase/decrease in the coefficient of friction are measured and evaluated.
この方法によれば、まず通常のＣ８８’ｉｉ−回行ない
、正規の浮上方法、リーディング側が上になり、トレー
リング側が下になることによシ、浮上状態が確認でき、
これが悪化するとクラッシュにおちいる。次に磁気ディ
スクと、磁気ヘッドの摩耗全加速させる之めに、トレー
リング側を先頭に逆転させ、ギャップ部を強制的に劣化
させる。ギャップ部及び磁気記録面が機械的ダメージを
受けると、それは磁気ディスクの出力低下となって確認
される。又磁気ディスクと磁気ヘッドが接触したまま移
動するため磁気ディスク表面と、磁気ヘッドのスライダ
一部が、加速的に機械的劣化上受け、それは摩擦係数の
変化として確認される。According to this method, the levitation state can be confirmed by first performing the normal C88'ii-turn, using the normal levitation method, with the leading side facing up and the trailing side facing down.
If this worsens, a crash will occur. Next, in order to completely accelerate the wear of the magnetic disk and magnetic head, the trailing side is reversed to the front, and the gap portion is forcibly deteriorated. When the gap portion and the magnetic recording surface receive mechanical damage, this is confirmed as a decrease in the output of the magnetic disk. Furthermore, since the magnetic disk and the magnetic head move while being in contact with each other, the surface of the magnetic disk and a portion of the slider of the magnetic head undergo accelerated mechanical deterioration, which is confirmed as a change in the coefficient of friction.
このようにＣ８８ｉ行ない、さらに加速的に機械的ダメ
ージが与えられるため、短期間によシ実際に近い評価が
可能となる。その評価項目も、磁気ディスクの損傷、浮
上特性、磁気ディスクの出力低下率、磁気ディスク−磁
気ヘッド間の摩擦係数の増加等が、全てがわかるように
なシ、今までの問題全解決した。Since C88i is performed in this way and mechanical damage is applied at an accelerated rate, it is possible to perform evaluations close to actual conditions in a short period of time. The evaluation items include damage to the magnetic disk, flying characteristics, rate of decrease in output of the magnetic disk, increase in the coefficient of friction between the magnetic disk and the magnetic head, etc., all of which have been solved.
本発明での磁気ディスクの回転のパターンを第１図に示
す。横軸が時間軸、縦軸が磁気ディスクの回転数を表わ
す。正方向の回転がグラス側で、マイナス＠は磁気ディ
スクが逆回転していることｔ示す。まず状態１で磁気デ
ィスクは、静止から３０００ ｒｐｍまで回転数が増加
する。このとき磁気ヘッドに静止、混合潤滑領域七経て
、浮上する。FIG. 1 shows the rotation pattern of the magnetic disk in the present invention. The horizontal axis represents time, and the vertical axis represents the number of rotations of the magnetic disk. Rotation in the forward direction is on the glass side, and minus @ indicates that the magnetic disk is rotating in the opposite direction. First, in state 1, the rotational speed of the magnetic disk increases from rest to 3000 rpm. At this time, the magnetic head remains stationary, passes through seven mixed lubrication regions, and then floats.
状態２で磁気ヘッドは、空気バネの原理で安定浮上を続
ける。状態３に磁気ディスクの回転数がゼロまで減少す
る過程で、磁気ヘッドは、トレーリング、リーディング
の順で着陸する。この状態１〜３までで１回の０８８と
なる。次に状態４でしばらく磁気ディスクと磁気ヘッド
が静止した後、状態５で磁気ディスクは低速で逆回転を
する。このとき回転数が低いため、磁気ヘッドは浮上し
ない。磁気ディスクが磁気ヘッドの衝撃を受けるのは状
８１，３．５の時であシそれぞれの状態での摩擦係数の
測定ができるが再現性よく摩擦係数の測定できるのは状
態５のときであるため、摩擦係数のデータな状態５の時
の値上使用する。In state 2, the magnetic head continues to fly stably based on the principle of air springs. In state 3, while the rotational speed of the magnetic disk decreases to zero, the magnetic head lands in the order of trailing and leading. These states 1 to 3 constitute one 088. Next, in state 4, the magnetic disk and magnetic head stand still for a while, and then in state 5, the magnetic disk rotates at a low speed in the reverse direction. At this time, since the rotational speed is low, the magnetic head does not fly. The magnetic disk receives an impact from the magnetic head when it is in states 81 and 3.5, and the friction coefficient can be measured in each state, but it is in state 5 that the friction coefficient can be measured with good reproducibility. Therefore, the friction coefficient data for state 5 is used above.
第２図は一般のＣ８Ｓ試験での磁気ディスクの回転パタ
ーンを示す。FIG. 2 shows the rotation pattern of a magnetic disk in a general C8S test.
本発明で使用した磁気ヘッドを第５図に示す。FIG. 5 shows the magnetic head used in the present invention.
このヘッドはＭｎ−Ｚｎ７エライト製のミニモノリシッ
クヘッドで市販の通常のタイプのものである。磁気ディ
スクが回転してヘッドが浮上する際、リーディング側が
先頭で傾むいた状態となる。This head is a mini-monolithic head made of Mn-Zn7 elite, and is a conventional type commercially available. When the magnetic disk rotates and the head flies, the leading side is tilted at the beginning.
試験装置全第４図に示す。まず磁気ディスク１にモータ
ー２に固定され、同様にヘッド５は歪ゲージ付のアーム
４に固定される。磁気ディスクが上から見て反時計方向
（正方向）に３０００ ｒｐｍに回転した時、磁気ヘッ
ドに安定浮上している。The entire test apparatus is shown in Figure 4. First, a magnetic disk 1 is fixed to a motor 2, and a head 5 is similarly fixed to an arm 4 equipped with a strain gauge. When the magnetic disk rotates at 3000 rpm counterclockwise (positive direction) when viewed from above, it is stably floating above the magnetic head.
磁気ディスクと磁気ヘッドが接触した状態で回転してい
る時、磁気ヘッドに歪を生じ、それを電気信号としてオ
シロスコーグで表示する。磁気ディスクが静止している
時、磁気ヘッドの荷重上Ｎ。When the magnetic disk and magnetic head rotate while in contact, distortion occurs in the magnetic head, which is displayed as an electrical signal on an oscilloscope. When the magnetic disk is stationary, the load on the magnetic head is N.
磁気ディスクが回転している時に磁気ヘッドが受ける力
七Ｆとすると、摩擦係数は、Ｆ ／ Ｎで表わされる。Assuming that the force that the magnetic head receives when the magnetic disk is rotating is 7F, the coefficient of friction is expressed as F/N.
磁気ヘッド５は電気信号増幅アンプ、フィルターを通し
て、記録、再生が可能である。The magnetic head 5 is capable of recording and reproducing data through an electric signal amplification amplifier and filter.
このような装置、方法で以下の如く試験する。The test is carried out using such equipment and method as follows.
（１） 磁気ディスク、磁気ヘッドを第４図のように
固定する。正方向に３０ Ｏｒｐｍで回転させ、磁気ヘ
ッドを浮上させ、磁気ディスクに２Ｆ（２，５ＭＨｚ
）で記録し、再生値？読む。(1) Fix the magnetic disk and magnetic head as shown in Figure 4. Rotate in the forward direction at 30 Orpm to make the magnetic head levitate, and apply 2F (2.5 MHz) to the magnetic disk.
) record and playback value? read.
（２）次に１０ Ｏｒｐｍで逆転し、その時の静摩擦係
数全歪ゲージから読みとる。(2) Next, reverse the rotation at 10 Orpm, and read the static friction coefficient at that time from the total strain gauge.
（３）第３図に示したモーターの回転パターンを１００
回行ない、そののちにＣ１）、 ＋２１で出力及び摩擦
係数の再測定全行ない、初期と試験後でどの程度変化し
たかをみる。(3) Change the rotation pattern of the motor shown in Figure 3 to 100
After that, remeasure the output and friction coefficient at C1) and +21 to see how much they changed from the initial stage to after the test.
このような方法で測定した結果を表−１に示す。The results measured using this method are shown in Table 1.
これよシ、従来の塗布型ディスクでは、摩擦係数の増加
は少ないが、２Ｆの出力低下が著しく、又メッキ、スパ
ッタなどで炸裂された薄膜ディスクは２Ｆの出力低下蝶
見られないものの、摩擦係数の増加は大きいもの、小さ
いものとに分離されることがわかった。In contrast, with conventional coated discs, the increase in the friction coefficient is small, but the 2F output decreases significantly, and with thin film discs that have been exploded by plating, sputtering, etc., the 2F output does not decrease, but the friction coefficient It was found that the increase was separated into large and small increases.
以上のようにこの測定によれば、磁気ディスクの耐久性
が、短期間に明確に測定され、かつ再現性の良いデータ
が得られるようになった。As described above, according to this measurement, the durability of the magnetic disk can be clearly measured in a short period of time, and data with good reproducibility can be obtained.
表−１
〔発明の効果〕
以上のように本発明によシ、今まで時間がかかつてかつ
再現のとりにくかった磁気ディスクの耐久性の評価が、
短期間で再現性良く、総合的に評価することが可能とな
った。Table 1 [Effects of the Invention] As described above, the present invention enables evaluation of the durability of magnetic disks, which has been time consuming and difficult to reproduce.
It has become possible to perform comprehensive evaluations with good reproducibility in a short period of time.
第１図に本発明による磁気ディスクの回転パターンのグ
ラフを示す図、第２図は一般のＣ８Ｓ試験時の回転パタ
ーングラフ金示す図。
第５図は一般的なミニモノリシックヘッドの断面図。
１・・・トレーリング
２・・・ギャップ
６・・・リーディング
第４図な磁気ディスクの耐久性を評価する装置の側面図
。
１・・・磁気ディスク
２・・・モーター
３・・・磁気ヘッド
４・・・歪ゲージ付アーム
以 上
出願人 セイコーエグンン株式会社
他１名
（＋）
′） 第２図FIG. 1 is a graph showing a rotation pattern of a magnetic disk according to the present invention, and FIG. 2 is a graph showing a rotation pattern during a general C8S test. Figure 5 is a cross-sectional view of a general mini-monolithic head. 1... Trailing 2... Gap 6... Leading Figure 4 is a side view of an apparatus for evaluating the durability of magnetic disks. 1...Magnetic disk 2...Motor 3...Magnetic head 4...Arm with strain gauge Applicant Seiko Egun Co., Ltd. and 1 other person (+)') Figure 2
Claims (1)
次に逆方向に定速で一定時間回転させることによって、
磁気ディスクの耐久性を評価することを特徴とする磁気
ディスクの試験方法。Rotate the magnetic disk in the direction in which the magnetic head floats,
Next, by rotating it in the opposite direction at a constant speed for a certain period of time,
A magnetic disk testing method characterized by evaluating the durability of a magnetic disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26424886A JPS63119079A (en) | 1986-11-06 | 1986-11-06 | Test method for magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26424886A JPS63119079A (en) | 1986-11-06 | 1986-11-06 | Test method for magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63119079A true JPS63119079A (en) | 1988-05-23 |
Family
ID=17400539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26424886A Pending JPS63119079A (en) | 1986-11-06 | 1986-11-06 | Test method for magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63119079A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5038625A (en) * | 1989-01-31 | 1991-08-13 | Seagate Technology, Inc. | Tribological head-disk interface testing system |
| US6348113B1 (en) | 1998-11-25 | 2002-02-19 | Cabot Corporation | High purity tantalum, products containing the same, and methods of making the same |
-
1986
- 1986-11-06 JP JP26424886A patent/JPS63119079A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5038625A (en) * | 1989-01-31 | 1991-08-13 | Seagate Technology, Inc. | Tribological head-disk interface testing system |
| US6348113B1 (en) | 1998-11-25 | 2002-02-19 | Cabot Corporation | High purity tantalum, products containing the same, and methods of making the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3990091B2 (en) | Magnetic head slider and magnetic disk device | |
| JPH10512702A (en) | FM detection of slider / disk interface | |
| JPH02121171A (en) | Inspection disc for inspecting component of magnetic disc driver and formation thereof | |
| US5038625A (en) | Tribological head-disk interface testing system | |
| JPS63119079A (en) | Test method for magnetic disk | |
| Kawakubo et al. | Wear life prediction of contact recording head | |
| JP2980885B2 (en) | Magnetic recording medium having shallow striations and method of manufacturing the same | |
| US5909341A (en) | Hard disk drive | |
| US6989671B2 (en) | Detection of slider-disk interference using a dynamic parametric test | |
| JP2003535419A (en) | Manufacture of data storage devices | |
| JP2005078708A (en) | Magnetic disk and magnetic disk unit provided with the same | |
| JPH01146103A (en) | Magnetic recorder | |
| US3673583A (en) | Recorder with means to move the spindle perpendicular to its axis of rotation | |
| Shoda et al. | Catastrophic damage of magnetic recording disk caused by slider-disk impact during loading/unloading | |
| JP2864676B2 (en) | Magnetic head | |
| JPH05128468A (en) | Floating type magnetic head | |
| JPH05109058A (en) | Device and method for evaluation test of durability of magnetic disk | |
| Chapman et al. | Recent progress in the production of error-free magnetic computer tape | |
| JPH05189756A (en) | Magnetic recording medium | |
| RU2026573C1 (en) | Method for measuring electrical parameters of magnetic heads | |
| JP2003036624A (en) | Recording operation evaluating device | |
| JPH0353146A (en) | Method for testing durability of discoid recording medium | |
| JPH07140023A (en) | Apparatus for measuring friction of disk surface | |
| JPH09180141A (en) | Magnetic disk inspecting head reproducing method | |
| JPH10326417A (en) | Magnetic disk and magnetic disk device |