29 Oct
2008
29 Oct
'08
6:17 p.m.
ethan.dicks at usap.gov wrote:
RWC was important with the ST-506 standard, but, IIRC,
it fell
away with the ST-412 standard, and the pin that the controller
used to tell the drive to reduce the write current was recycled
as another head-select line, allowing an ST-412-compatible drive
to have 9-16 heads. More modern drives kept track of which track
they were on and handled RWC internally, sometimes based on the
Write Precomp value, I think.
Yes, ST-412 interface drives did RWC internally, if they needed it, but
they decided based on maintaining their own cylinder counter. It was
unrelated to any write precomp cylinder threshold in the controller
settings, since the drive had no practical way to know what the precomp
setting was.
Eric