cctalk Digest, Vol 34, Issue 8
Billy.Pettit at wdc.com
Tue Jun 6 16:38:52 CDT 2006
Mark Tapley wrote: There were significant problems with drive dust
the NeXT implementation. That led to reversal of the fan (by
mechanically reversing, *not* by changing around the power connector,
in case you want to try it) by many owners, which was eventually
approved by NeXT. However, my cube has a fairly unique set-up which
meant that fan reversal caused problems with overheating of the SCSI
There were also long-term problems with either the drives or
the media - they seem to be going bad at a fairly regular pace. I
don't know that I've heard a good explanation for that. It *might* be
some form of connector corrosion; disassembling and cleaning mine has
cured it twice, even though it didn't look dirty at all around the
Corrections or clarifications welcome, apologies if this is
redundant (getting behind on the digests again).
Billy: Dust was a huge problem with most of the earlier CDROMs. And a
bigger problem when CD-RW came along. On my first trip to Hasselt, Belgium
with Philips I was introduced to the Calibrated Dust Machine. This is no
BS. Philips worked with IBM to develop a chamber that was filled with fine
dust under slight pressure. The optical drives would be tested to failure.
Some of the early drives would only go minutes before failure. Often
powering them down and starting up was enough to remove the dust for a short
time. Engineering would also test all the competitors to see how they
sealed their units and how long they lasted. LG had by far the best seals
around the OPU.
Philips redesigned all their front doors and bezel seals to improve dust
immunity. And sold testing to other companies.
One of those memories that lasts a lifetime: the test engineer complaining
about how hard it was to buy calibrated dust.
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