KR100291106B1 - Upper-motorized CSS and Drag Tester and Testing method of Actual Harddisk drive - Google Patents

Abstract

The present invention relates to a top-driven CSS (Contact-start-stop) and a drag test device for testing the reliability and durability of a hard disk, wherein the disk media having magnetic recordings are separated and mounted on a test device or a disk only. Unlike the existing commercially available CSS tester, which must be purchased separately and installed in the tester, the present invention relates to a device and a method capable of performing the CSS test as well as the drag test inexpensively and quickly while using the finished hard disk as it is. As a test method, the cover of the hard disk finished product 10 is opened and the disk media 11 of the hard disk finished product 10 is directly rotated as the flexible coupling 12 by using the precision motor 13 mounted on the top. The test is performed by contacting the head / slider 20 connected to the head / slider arm 21 attached to the four degree of freedom microfeed mechanism 22. The test equipment is composed of a hard disk finished product (10), a disk media (11), a head / slider (20), a precision motor (13), a four degree of freedom microfeed mechanism (22), and a head / slider arm (which serves as a specimen). 21), consisting of the coupling of the flexible coupling 12 and the control computer 14, thereby constructing an automated CSS and Drag tester.

Description

Upper-motorized CSS and Drag Tester and Testing method of Actual Harddisk drive} using commercially available hard disk finished products as test specimens

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, which are rapidly progressing in recent years due to the development of computers and storage media. The present invention provides an apparatus and method for simultaneously performing a contact-start-stop (CSS) test and a drag test using a finished disk.

CSS testing is known as an existing test method. The CSS test allows the head / slider to repeat landing and landing on the disk media surface and ultimately disk media by artificially applying the same conditions and conditions as the actual hard disk operating conditions, such as rotational speed and the landing and landing position of the head / slider. And test the reliability and durability of the head / slider.

Known CSS test methods have been carried out using a dedicated CSS tester, which is a special tester designed to apply the appropriate operating conditions by mounting the head / slider and disk media to the tester. Therefore, using the existing CSS tester would require purchasing separate head / slider and disk media or removing the disk from the finished hard disk.

The existing drag test is a test method that accelerates the wear between the head / slider and the disk media by rotating the head / slider in contact with the disk media under the same suspension preload as the actual hard disk operating conditions. This test is performed by rotating the disk media at a low speed before the slider takes off.

In the drag test, the head / slider does not receive enough lift and thus does not injure and comes into sliding contact with the disc media. It can be modeled as being in contact.

The CSS test takes a lot of time to test the durability because it applies the operating conditions of the actual hard disk, whereas the drag test saves the test time because the breakage of the disk media 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 dedicated test apparatus for carrying out drag tests has been developed, primarily through low and constant speed control of the motor to achieve the test objectives.

Currently, CSS and drag tests are carried out in a drag test device manufactured separately from an expensive CSS-only test device, 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 time and economic shortcomings of the purchase of the test specimen occur in the test method by separately purchasing and using the disk media to be tested.

Therefore, the present invention is a commercially available hard disk by choosing a method of mounting the existing expensive CSS test device or drag test device, and the economical problem of having to hold a separate disk media and each dedicated test device as described above. Not only do not take into account the impact of the finished product's structural characteristics, but also the time required for the purchase of disc media, the economical consequences of buying a large quantity of disc media, the fact that it can only be tested on mass produced disc media, and the testing of commercially available hard disc In order to solve this problem, the disk media should be removed from the hard disk and installed in a dedicated test apparatus. This process provides a test apparatus and method to solve the problem of the disk media contamination problem that may have a decisive effect on the disk media test. Purposefully All.

A feature of the present invention for achieving this object is the step of opening the cover of the commercialized hard disk finished product, and through the above step of connecting the central axis of the open disk media to the coupling to drive the top of the disk media by a precision motor Contacting the disc media mounted on the commercially available hard disc finished product by directly driving the central axis of the disc media through the driving step and testing the contact / start / stop state and drag of the disc media by driving the shaft of the disc media. It features a top-driven test method that utilizes a commercially available hard disk finished product as a test specimen for start / stop and drag tests.

Another aspect of the present invention is a disk media of the finished hard disk, the flexible coupling connected to the central axis of the disk media, the precision motor connected to the flexible coupling, the computer for controlling the precision motor and And a head / slider in contact with the disk media as a relative contact member of the disk media, a head / slider arm on which the head / slider is mounted, and a four degree of freedom transfer mechanism on which the head / slider arm is mounted. It features a top-drive test device that utilizes the finished disc as a test specimen.

1 is a view showing the configuration of the top-driven contact / start / stop and drag test apparatus according to the present invention

* Description of the symbols for the main parts of the drawings *

10: Finished Hard Disk 11: Disk 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.

1 is a front view showing the configuration of a top-drive type CSS and drag test device using a commercially available hard disk finished product according to the present invention. As shown in FIG. 1, the test apparatus of the present invention includes a disk media 11 of a hard disk finished product 10 having an open cover, a flexible coupling 12 connected to a central axis of the disk media 11, and a flexible couple. A precision motor 13 connected to the ring 12, a computer 14 for controlling the precision motor 13, a head / slider 20 serving as a mating contact member of the disc media 11, and a head / slider The head / slider arm 21 to which 20 is mounted and the four degree of freedom transfer mechanism 22 to which the head / slider arm 21 are mounted are comprised.

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 is mounted with the disk media 11 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, and the speed of the disc media 11 is increased. As a result, the head / slider 20 receives lift and moves in contact with the disk media 11 or floats on the surface. By performing the acceleration and deceleration at high speed so that the precision motor 13 repeats the contact between the head / slider 20 and the disk media 11, the CSS test is performed, and the precision motor 13 is controlled to run at constant speed at low speed. The drag test is conducted by inducing continuous contact between the head / slider 20 and the disc media 11.

As described above, the present invention can be tested in consideration of the structural influence of the household elements 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 the test method thereof, and the second separate Eliminate the time-consuming trouble of disk media specimens and the economic burden of bulk ordering. Third, by connecting flexible disk media with flexible couplings, any hard disk finished product can be used as a specimen. Fourth, CSS and drag test methods In addition to reducing the economic burden on the purchase of two expensive dedicated devices, the fifth device can be used to test the performance of a specific hard disk product from the perspective of the user or researcher, not from the hard disk manufacturer. Fast and cheap Improve the reliability of performance tests on the hard disk in the finished product that can be performed and provides the effects that can save time for the CSS exams and drag and reduce the economic burden necessary for the test.

Claims (2)

Opening a cover of a commercially available hard disk finished product 10; An upper driving step of the disk media driven by a precision motor by connecting the central axis of the disk media 11 opened through the above step to the coupling; The disc media mounted on the commercially available hard disc finished product 10 by directly driving the central axis of the disc media by testing the contact / start / stop state and drag of the disc media by driving the disc media shaft. (11) A top drive type test method utilizing a commercially available hard disk finished product as a test specimen, characterized in that it is used as a specimen of the contact / start / stop and drag test. A disk medium 11 of the finished hard disk 10 with the cover open; 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 in contact with the disk media as a relative contact member of the disk media 11; A head / slider arm 21 on which the head / slider 20 is mounted; The top drive test apparatus utilizing the commercially available hard disk finished product, characterized in that the four-degree of freedom transfer mechanism equipped with the head / slider arm (21) as a test specimen.