A couple of fixes?
Posted Jul 13, 2006 22:01 UTC (Thu) by dfsmith
In reply to: A couple of fixes?
Parent article: The 2006 Linux Filesystems Workshop (Part II)
In modern disk drives, at the innermost and outermost slider positions, the read head is +/- 10 tracks away from the write head. (Unfortunately 1-cosine!=0.)
To correct DNW (did-not-write) you would have to waste about 1.5 revs to reposition and read. (Depends on write length.)
To correct WWP (wrote-wrong-place) you have to first read all tracks where you might accidentally write, do the write, then verify the write and the other tracks.
Oddly enough, people buy preferentially on performance.
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