On Fri, 13 Aug 1999, W Gerald Hicks wrote:
:->When I kept up with the numbers for these things in a former
:->life working for a disk manufacturer, I was always astounded
:->at how much current the drives pulled during their power-on
:->sequence. After startup, current begins to taper off rapidly.
This stopped being relevant a long time ago, but...
DEC MIPS-based workstations worked around this problem by having
tweaked PROMs on their SCSI drives, with a SPIN-UP-ON-POWERON bit that
defaulted to off. Ultrix would send the drives the SCSI command to
spin them up - *after* everything else in the system was powered
on. This meant they could use a cheaper power supply, as no supported
configuration required it to deal with more than one drive spinning up
at a time.
Dealing with this was the *least* of the problems in trying to use DEC
SCSI drives on other platforms. But they could be made to work.
<mike
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