Claims
- 1. A method for restoring a head to a track 0 in a disk drive unit in which an information recording medium formed in a shape of a disk is driven to be rotated and the head is moved by use of a stepping motor to effect a recording or reproducing of an information, the method being achieve by detecting a position of the track 0 at an outer-most location in a recording area of the information recording medium comprising the following steps of:
- disposing a first area and a second area on the recording medium each for beforehand writing therein a servo information, said first and second areas being adjacent to each other in a rotational direction of the information recording medium;
- writing the servo information in an area outside the track 0 in a portion of the first area, and writing the servo information in a portion of the second area inside the track 0, and writing the servo information configured alternately in a zigzag shape in a preset portion of the first and second areas inside the recording area;
- positioning the head to a position outside the track 0 by exciting the stepping motor;
- returning the head thereafter toward an inner side to detect a position where the track 0 is found within a cycle of an excitation phase of the stepping motor;
- positioning the head at a position separated from the track 0 by a preset number of steps; and
- controlling thereafter a current ratio to effect an excitation on a preset excitation phase, thereby positioning the head to the position over the track 0.
- 2. A track 0 restoring method according to claim 1 wherein said stepping motor is of a 4-phase, unipolar type.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-128221 |
Jun 1986 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 015,449, filed 02/17/87 now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0154085 |
Sep 1985 |
EPX |
57-212665 |
Dec 1982 |
JPX |
60-109015 |
Jun 1985 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
15449 |
Feb 1987 |
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