Oscillation test for off track write
View Patent ↗An enhanced oscillation test for detecting off track writing associated with a read/write head writing, on a magnetic media, a measurement track. Once the measurement track is written, a series of seek, write, and read operations is performed, e.g., between various origin tracks and the tracks adjacent to the measurement track, in order to detect any off track write problems. If a measurement track read operation fails a certain number of times, then an error code is generated which indicates an off track write problem.
1. A method of detecting an off track write problem associated with a read/write head, the method comprising:
writing a measurement track on a media;
for a plurality of origin tracks spanning the writeable tracks of said media, wherein each successive origin track is a certain number of tracks away from the previous origin track, repeatedly
seeking said origin track;
seeking and writing each adjacent track which is adjacent to said measurement track, with a seek to said origin track between said seeking and writing of each respective adjacent track;
repeatedly reading, up to a certain number of times, said measurement track; and
if said reading fails at least a first threshold number of times, then generating a first error code associated with an off track write problem.
2. The method recited in claim 1 , further comprising:
if said writing a measurement track fails a second threshold number of times, then generating a second error code associated with an off track write problem.
3. The method recited in claim 1 , wherein said certain number equals one hundred and wherein said first threshold equals five.
4. The method recited in claim 1 , wherein said first threshold is approximately five percent of said certain number.
5. The method recited in claim 1 , wherein said writing a measurement track and said reading said measurement track are performed from start of track to end of track.
6. The method recited in claim 1 , wherein said writing each adjacent track is performed from start of track to end of track.
7. The method recited in claim 1 , wherein said certain number of tracks equals the quotient of said maximum number of tracks on said media divided by one thousand.
8. The method recited in claim 1 , wherein said seeking and writing each adjacent track comprises seeking and writing said adjacent track closest to said origin track followed by seeking and writing said adjacent track farthest from said origin track.