KR20000001380A - Head actuating type css and drag tester using commercial hard disk drive and testing method - Google Patents

Abstract

PURPOSE: A head actuating type CSS and Drag tester using a commercial hard disk drive and a testing method is provided to examine CSS tester and Drag test together and to use the commercial hard disk drive without analysis of the hard disk drive. CONSTITUTION: The testing method comprises the steps of opening a cover of the commercial hard disk drive, connecting a center shaft of a disk media with a flexible coupling and rotating the center shaft to test the CSS test and the Drag test.

Description

Apparatus and test method for top drive type CS and drag using commercially available hard disk finished products

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test apparatus and method for testing the durability and reliability of a hard disk among magnetic memory devices having recently advanced rapidly due to the development of computers and storage media. The present invention relates to a test apparatus and a method for simultaneously performing a CSS (Contact-start-stop) test and a Drag test using a finished disk. In the existing test method, CSS test means that the head / slider repeats the landing and landing on the disk media surface and artificially applies the same environmental conditions as the actual hard disk operating conditions such as the rotation speed and the landing and landing positions of the head / slider The test is to test the reliability and durability of the disk media and head / slider. The existing CSS test method was performed using a CSS-only test apparatus, and a CSS-only test apparatus is a special test apparatus designed to apply appropriate operating conditions by mounting a head / slider and disk media to the test apparatus. Therefore, to use the existing CSS tester, you need to purchase separate head / slider and disk media or remove the disk from the finished hard disk and test it. The existing Drag test is a test method that accelerates abrasion between the head / slider and the disk media by rotating the head / slider in contact with the disk media at the same suspension preload as the actual hard disk operating conditions. It is a test method to rotate disk media. In the Drag test, the head / slider does not receive enough lift, so it does not injure and makes sliding contact with the disk media. It can be modeled as being in contact. The CSS test takes a lot of time for durability test because it applies the operating conditions of the actual hard disk, whereas the drag test saves test time because the disk media breakage occurs faster than the CSS test method, but the degree of damage is actual. The difference is larger than, and all other operating conditions except for speed are the same. No special test equipment has been developed to perform the drag test. The test objectives are mainly achieved through low speed and constant speed control of the motor.

Currently, the CSS and Drag tests are conducted in the Drag tester, which is manufactured separately from the expensive CSS-only tester, and the structural characteristics of the actual commercially available hard disk products are different in that the disk media and the head / slider are mounted in a separate device. There is a technical shortcoming that the influence on the test cannot be taken into account, and the disc media to be tested is purchased separately and used as a test piece. Thus, the test method causes a time and an economic disadvantage of purchasing the test piece.

The present invention, as described above, the economical problem of having to possess the existing expensive CSS test device or drag test device, and by purchasing a separate disk media and the method of mounting on each dedicated test device finished commercialized hard disk Not only take into account the impact of the structural characteristics of the system, but also the time required to purchase disk media, the economic problems of large quantities of disk media, only the production of disk media can be tested, and hard to test commercially available hard disks. The purpose of this study is to provide a test apparatus and method to solve the problem that the disk media contamination problem that may have a decisive influence on the disk media test may be performed. .

In the present invention, in order to achieve the above object, first, by combining each test purpose of the existing CSS test device and the Drag test device to a single test device to eliminate the inconvenience and economic loss of having both test devices Second, by using the disc media as a test piece by connecting the disc media and the precision motor with flexible coupling by opening the cover of the commercially available hard disk finished product, the structural influence of the mechanical elements such as the spindle bearing of the hard disk during the test At the same time, it provides a mobile test method in that it can be used by directly connecting the finished hard disk products, and it is possible to experiment with a small amount of finished hard disk products by selecting a specific commercially available hard disk finished product without having a large amount of specimens. Inexpensive test equipment and test methods The.

1 is a front view showing the configuration of the top-driven CSS and Drag test apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10 hard disk finished product 11: disc media

12: flexible coupling 13: precision motor

14: control computer

20: Head / Slider 21: Head / Slider Arm

22: 4 degree of freedom transfer mechanism

The configuration and test method of the top-driven CSS and Drag test apparatus using the finished commercial hard disk product according to the present invention will be described in detail through an embodiment of the present invention.

The accompanying drawings, Figure 1 is a front view showing the configuration of the top-drive type CSS and Drag test apparatus using the finished commercial hard disk according to the present invention. The test apparatus of the present invention includes a disk media 11 of a hard disk finished product 10 having an open cover as shown in FIG. 1; A flexible coupling 12 connected to the central axis of the disc media 11; A precision motor 13 connected to the flexible coupling 12; A computer 14 for controlling the precision motor 13; A head / slider 20 as a mating contact material of the disc media 11; A head / slider arm 21 to which the head / slider 20 is mounted; The four degree of freedom transfer mechanism 22 to which the head / slider arm 21 is mounted is configured.

In preparation for the test, the cover of the finished hard disk 10 to be used as a specimen is opened to expose the disk media 11, and the flexible coupling 12 is connected to the central axis of the existing disk media 11. . The reason for connecting the flexible coupling 12 is to minimize the effects of vibration, eccentricity, etc. of the precision motor 13 due to the rotation, and the structural influence of the hard disk finished product 10 on which the disk media 11 is mounted. This is to consider and utilize the flexibility of the coupling to make it easy to connect the disk media of any hard disk finished product. After the connection between the disk media 11 and the flexible coupling 12 is completed, a separate head / slider 20 is mounted on the head / slider arm 21, and the head / slider arm 21 is mounted. After operating the four degree of freedom transfer mechanism 22 to move the head / slider 20 to the part to be contacted with the disc media 11, the z axis of the four degree of freedom transfer mechanism 22 is transferred to the hard disk manufacturing company. The recommended preload is applied between the head / slider 20 and the disc media 11. The reason why the head / slider arm 21 is mounted on the four degree of freedom transfer mechanism 22 is to move the head / slider 20 freely and freely contact the disk media 11 at any position.

When the precision motor 13 controlled by the computer 14 is rotated at a high speed or a low speed, the disc media 11 of the finished hard disk 10 connected to the flexible coupling 12 rotates, depending on the speed of the disc media. The head / slider 20 is lifted and moves in contact with the disk media 11 or floating on the surface. Perform the CSS test by testing the precision motor 13 to repeat the acceleration and deceleration at high speed so that the contact between the head / slider 20 and the disk media 11 is repeated, and to drive the precision motor 13 at constant speed at low speed. The drag test is performed by inducing continuous contact between the head / slider 20 and the disc media 11 by controlling it.

The present invention configured and operated as described above can be tested in consideration of the structural influence of the mechanical components of the finished hard disk by using the first commercialized hard disk finished product as a specimen, compared to the existing CSS and Drag test apparatus and test method. Secondly, it can reduce the time burden of separate disk media specimen procurement and the economic burden of ordering large quantities. Third, any hard disk finished product can be used as a specimen by connecting flexible disk media. And by applying the Drag test method to one test device, it is possible to drastically reduce the economic burden required for the purchase of two expensive dedicated devices. Fifth, by using the finished hard disk product, the user or researcher, not the hard disk maker's position, Specific hard disk finished product To improve the reliability of performance tests on the hard disk in the finished products that can be tested quickly and inexpensively performed and provide the effects that can save time for the CSS exams and Drag and reduce the economic burden necessary for the test.

Claims (2)

By opening the cover of the commercially available hard disk finished product 10 and directly driving the central axis of the disk media 11, the disk media 11 mounted on the commercially available hard disk finished product 10 is used as a specimen for CSS and drag tests. Test method utilized. CSS and Drag test apparatus for driving as a precision motor 13 by connecting the central axis of the disk media (11) to a flexible coupling (12) in a commercially available hard disk finished product (10).