Method to compensate for tape slope and head azimuth errors
US5001580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1989 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Sep 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is provided to compensate for tape slope (A) and read/write head block (102) azimuth (B) errors in a tape drive system (100). The method writes a data pattern (504) on a magnetic medium (104) at a known slope (C). The portion of the magnetic medium (104) that is encoded with the data pattern (504) is then moved across the read/write head block (102), so that first one read head (154) and then the other read head (152) detects the recorded data pattern (504). The time difference (.DELTA.T.sub.ON) between the event of each head (154, 152) first sensing the data pattern (504), and the time difference (.DELTA.T.sub.OFF) between the points where each head (154, 152) no longer detects the data pattern (504), are both recorded. The recorded information is used to analyze the angular offset (A-B) between the centerline (192) of the tape (104) and the centerline (194) of the read/write head system (102). The angular offset (A-B) is used to determine a lateral displacement (D) between the two read heads (154, 152) in a direction perpendicular to the centerline (192) of the tape (104). The lateral displacement (D) is used to adjust the stepping distance between data tracks recorded i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.