On Thursday, December 30, 2004, at 08:14 AM, Bill Judson wrote:
I "hear tell" some (many?) drives have a jumper setting that will let you
delay them spinning up a few seconds, based on their ID #.
This only applies to higher end SCSI drives designed for servers and RAIDs, to enable the SCSI interface to wake up first, then poll the RAID for disks. ATA disks do not have this option.
This is a bad idea for desktop use; you end up with drives that will not mount unless manually done so. I had a Compaq-branded Seagate 4.5 G drive that I eventually gave up on, because it wouldn't stop this behavior, no matter how I set the jumpers. Compaq had fubared the ROM in that one so it could only be a RAID drive. I could start the computer, use SCSI Probe to mount the drive, whereupon it would work fine, even remount automatically after a warm reboot, but wouldn't mount again after a power cycle.
In general, on a Mac you want all SCSI devices 'awake' and functioning before the SCSI controller comes up, which is an argument for leaving the memory test on, if you have a bunch of SCSI drives.
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