3 Jan
2008
3 Jan
'08
4 p.m.
Date: Thu, 03 Jan 2008 12:31:03 -0500
From: "Roy J. Tellason" <rtellason at verizon.net>
I ran a perstor card with a pair of ST251 drives up
until I got my first
540M ATA drive, 24/7, for a few years, and they proved quite reliable.
The bearing noise of those drives got to be a bit much by the time I shut
them down, though.
Was this the ARLL (2x MFM capacity) Perstor controller? If that's
the case, I'm doubly surprised. On the first count that you got
ST251s to perform reliably with it and, on the second count, that you
didn't have to use ST251R drives.
I seem to recall that the difference between the ST251 and the ST251R
was how individual specimens behaved on final QA. They both started
off as the same drive, but some performed better than others and so
were labeled with the "R" designation.
I don't know if it was the bearing noise of the 251s that was more
objectionable or the resonance from the copper spring clip at the end
of the spindle. On some drives, the spindle brake would fail leading
to some really awful squealing noises from the brake pad. My usual
solution was to remove the culprit, whichever it was.
Cheers,
Chuck
3 Jan
3 Jan
6:59 p.m.
On Thu, 3 Jan 2008, Chuck Guzis wrote:
Was this the ARLL (2x MFM capacity) Perstor
controller? If that's
the case, I'm doubly surprised. On the first count that you got
ST251s to perform reliably with it and, on the second count, that you
didn't have to use ST251R drives.
It may depend on how we define "reliably".
Remember when Steve Gibson's Spinrite (not the current edition, now)
would, by default return to use tracks that were on the manufacturer's bad
track list, if they passed Spinrite's "tests".
4 Jan
4 Jan
3:45 a.m.
On Thursday 03 January 2008 19:00, Chuck Guzis wrote:
I'm not really sure at this point which one it was, but probably, since I
was getting a total of around 156MB out of those two drives.
Date: Thu, 03
Jan 2008 12:31:03 -0500
From: "Roy J. Tellason" <rtellason at verizon.net>
I ran a perstor card with a pair of ST251 drives up until I got my first
540M ATA drive, 24/7, for a few years, and they proved quite reliable.
The bearing noise of those drives got to be a bit much by the time I shut
them down, though.
Was this the ARLL (2x MFM capacity) Perstor controller? If that's the case, I'm doubly surprised. On
the first count that you got
ST251s to perform reliably with it and, on the second count, that you
didn't have to use ST251R drives.
I seem to recall that the difference between the ST251 and the ST251R
was how individual specimens behaved on final QA. They both started
off as the same drive, but some performed better than others and so
were labeled with the "R" designation.
That "R" meaning RLL-rated? It's my recollection from much HD discussion
back
then that the major difference in RLL-rated drives was the bandwidth of one
part, though memory is a bit hazy about which part that was -- the data
separator maybe? The numbers 5 MHz vs. 7.5 MHz come to mind also.
I don't know if it was the bearing noise of the
251s that was more
objectionable or the resonance from the copper spring clip at the end
of the spindle.
I've taken those off on occasion. :-)
On some drives, the spindle brake would fail leading
to some really awful
squealing noises from the brake pad. My usual solution was to remove the
culprit, whichever it was.
I think I've encountered that brake pad noise once, too.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
6201
days inactive
6201
days old
2 comments
3 participants
participants (3)
-
cclist＠sydex.com -
cisin＠xenosoft.com -
rtellason＠verizon.net