5 Feb
2006
5 Feb
'06
4:29 p.m.
On Sun, 5 Feb 2006, Richard wrote:
I've been told that the imparted momentum on some
large dishwasher
sized drives was such that if you rapidly seeked all the way across
the drive, the impact at the end would jiggle the drive slightly. By
writing a routine that did something like:
...
You could cause the drive to walk across the machine room and unplug
itself once the cord limit was reached.
Been there, seen it. The HP 7933 drives:
http://hpmuseum.net/image.php?file=1344
had onboard diagnostics, including a random seek test. If you didn't
have the stabilizer feet cranked down, these drives would indeed "walk"
during the seek test. The 7933 used a large "voice coil" to position the
head assembly.
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://ripsaw.cac.psu.edu/~mloewen/Oldtech/