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Method for Determing Head Settling Time

IP.com Disclosure Number: IPCOM000038711D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Nakagawa, Y: AUTHOR [+2]

Abstract

This article describes a method for determining a settling time of a head on a desired track in a disk drive of wedge servo type without using any special measurement instruments. Fig. 1 shows a head and a disk having a wedge servo area in the disk drive. The operation to determine the settling time is conducted by utilizing the wedge servo under control of a host system connected to the drive. The host and the drive interact with each other accord (Image Omitted) ing to the following sequence where the operation steps of the host and the drive are respectively identified by H and D. Of course, the host and the drive are required to have a program and/or microcode adapted to conduct these operation steps.

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Method for Determing Head Settling Time

This article describes a method for determining a settling time of a head on a desired track in a disk drive of wedge servo type without using any special measurement instruments. Fig. 1 shows a head and a disk having a wedge servo area in the disk drive. The operation to determine the settling time is conducted by utilizing the wedge servo under control of a host system connected to the drive. The host and the drive interact with each other accord

(Image Omitted)

ing to the following sequence where the operation steps of the host and the drive are respectively identified by H and D. Of course, the host and the drive are required to have a program and/or microcode adapted to conduct these operation steps. (1) H: Designate a start track and a target track for a seek operation, and then order the drive to position the head on the start track. (2) D: Position the head on the start track. (3) H: Designate a delay time T1a between a moment when the wedge servo information is to be detected and a moment when the seek operation is to start, and then order the drive to conduct the seek operation according to the designated delay time. (4) D: Conduct the seek operation to move the head to the target track from the start track after the delay time from the detection of the wedge servo information, as shown in Fig. 2 illustrating the operation timing. (5) D: Measure the time T2a from the completion of the seek operation to the next detection of the wedge servo information. (6) D: Calculate a position datum D1a indi...