>Internal hard drive problems. Help me please!
>
>I've loved my rock-solid PowerMac 8600--with 512 megs of RAM and two
>internal Quantum hard drives (2 Gigs and 1 Gig) until recently when
>the power supply failed and the screen went dark. I purchased a used
>one on eBay, and have installed it, but I've hit a snag. It starts
>up ok with my OS 8.5 cd-ROM disk, but refuses to recognize the
>internal hard drives like it did before--although it does recognize
>each of them when they're hooked up as external drives. Neither
>Drive Setup nor SCSI Probe find them either.
>
>The PDF service manual downloaded from Gamba hasn't been much help,
>but it did mention that the "back" internal drive must be
>"terminated." None of the attempted wiring options I've used has
>worked. There are three available sets of 4-wire groups that emerge
>from the power supply. One set has "R1" and "S1" on its connector
>ends, a second set shows "T1" and "U1", and the third set, the
>longest, is unmarked. There is also a 4-wire set with a smaller
>connecter end that I assumed would be for an optional Zip drive that
>I don't have. The only devises in the extra drive bays are my
>Quantums.
>
>Can someone please help me make sense of which power supply
>connectors need to be connected to my 50 pin Quantum drives so that
>the computer will recognize them? I would be very grateful to any
>advice/help from you Mac cognosenti who know about these matters.
>
>Greenfield Bowie
Hmmmm - interesting one....any 4 pin power connector can be used for
any CD or hard drive provided it will reach ok - they're just power
supply - and the power connector for my zip (pulled from an 8600) is the
same size as the HD connectors. Is there a zip adapter on the HD power
supply?
If one of the HD's is OEM it should have termination enabled through
a jumper - on smaller Quantum's they are sometimes on the underside of
the drive rather than the front - this will be the 'back drive' and
should be the last on the cable. Apart from the termination jumper there
should be no other jumpers except if it has reserved pins (the manuf spec
will show these) - this gives the 'back' drive the id 0 - the default
startup drive id.
The second HD can go anywhere along the chain with any id which is
unused - ignore any other pins on the drive and at the back of the drive
next to the scsi connector are the six pairs of id pins - no jumpers is
id 0 - a jumper across the pins closest to the right side of the back of
the drive gives id 1
So......
. . . . . .
. . . . . . is id 0
. . . . . (.)
. . . . . (.) is id 1
The CD should be id 3 or 4 and the zip is usually id 5 so 1 should
be ok for the second HD.
Fire it up and zap the pram....see what happens.....
Pete
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