Method and apparatus of measuring seek time using optical disk apparatus
US5398222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1993 |
| Grant date | Mar 14, 1995 |
| Priority date | — |
| Expiry date | Dec 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2525
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical disk apparatus and a method of measuring seek time using it. The method comprises the steps of allowing a host system to generate a seek instruction, calculating instruction time, transferring the seek instruction from the host system to the optical disk apparatus, driving a timer of the host system to start a counting operation of the timer and setting a count of the timer at that time as a seek start time, generating an interrupt signal to the timer in the host system to stop the counting operation of the timer if an optical head reaches accurately a desired target track on an optical disk for a predetermined time period and setting a count of the timer at that time as a seek stop time, obtaining the seek time by subtracting the seek start time, latency time per 1/2 revolution of the optical disk and the instruction time from the seek stop time, and sending an error message code to the host system to notify the host system of a failure in an seek operation if the optical head does not reach accurately the target track for the predetermined time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.