Bruce Godfrey wrote:
I just discovered another effect of having hard drives on the ATA66
bus. The computer would not enter sleep mode before, but now that the
only drives are the two on the ATA100 bus, it goes right to sleep when I
click that button on the login screen.
Go figure.
Bruce
Kris Tilford wrote:
On Oct 30, 2011, at 12:55 PM, Bruce Godfrey wrote:
Can any of you think of any reason why having drives on the ATA66
bus is incompatible with having a SCSI drive?
No, there shouldn't be any interference between a SCSI bus and an ATA
bus. Some ATA100 & ATA133 HDs have problems with ATA66 speed and
won't be recognized on an ATA66 bus. Older Maxtor drives had a
special drive utility to change the firmware on the HD to support
either older slower ATA66; or faster ATA100. One Maxtor utility was
called "66to100.exe", but this was a DOS-only program, and it's
doubtful you need this, and even if you do, better to get a new HD
than mess with this.
I don't understand why you're using the ATA66 bus for a HD? Normally
the ATA66 bus would be the optical drive bus, and the ATA100 bus
should support two HDs. Since there are 4 bays total, I'm assuming
the OEM optical drive occupies one, the SCSI drive another, this
would leave only two open bays, and that happens to be just the right
number for two ATA100 HDs, so that leaves no open bays and no reason
to use the ATA66 bus for a HD. If this is correct, connect the HD to
the ATA100 bus and leave only the optical drive on the ATA66 bus.
Should work.
It is a matter of space and the interior layout of the G4 MDD. At the
front of this computer there are two ATA66 headers on the MB. One has
a long IDE cable in it that is routed up the opposite side of the case
to the two optical drive bays located behind those mirrored drive
doors. The other has an IDE cable in it that is exactly the right
length to reach two HDs which can be placed in the dual drive carrier
under the optical bays. There is a matching two plug power cable
right there as well. Apple clearly planned for us to be able to have
some extra storage there. My MDD came with two drives mounted in the
front carrier, I just hadn't used them yet.
The only other place you can put hard drives in this machine is at the
back in another two drive carrier adjacent to the ATA100 header on the
MB. I had one IDE drive and one SCSI drive there. With just those
two together everything was peachy. I am going to look for a longer
IDE cable and see if I an route it up to the front to put two drives
in that front carrier onto the ATA100 bus and just not use the second
header on the ATA66 bus. Maybe things will work better then. Still,
what happened is pretty mysterious, don't you think?
Bruce
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