On  9 Sep 98 at 19:58, Brad Loomis wrote:

> I am installing an OEM IBM DDRS34560W drive. Since it did not come
> with any manuals, I am not sure of some of the jumper settings. I
> downloaded the "Quick Install Guide" from IBM, but it gives no
> explaination of a couple of the settings. I plan to set it as my
> boot drive with my existing WD 2GB as secondary drive. It will be
> ID #0, which i believe is correct for booting.

  The Adaptec controller BIOS (cannot speak from first-hand
experience about other SCSI controllers) allows you to set the ID to
boot from, and Windows will honour that.  [SCO does not -- it will
only boot from ID 0.]

> The ones I don't know are:
> 1. Enable Auto Spin-up

  As opposed, I think, to waiting for the controller to tell it to do
so.  I'd enable this.

> 2. Disable Unit Attention

  This is like an IRQ but on the SCSI bus instead of ISA or PCI.
Disabling it would mean that the controller would have to constantly
poll the drive.

> 3. Enable TI-SCTR/WDTR (60,80pin)

  I believe this is setting whether termination of this device
applies only to the wide (68-pin) connection, or the SCA (80-pin)
connector.

> 4. Enable Auto start delay
> 5. Delay Start 6/12

  Disable/ignore.  These are primarily intended for multiple-disk
(RAID) systems.
  It takes more power to start up a drive than to keep it spinning.
Rather than hit a massive power requirement at boot, #4 tells the
drive to wait for (ID x N) seconds from power on before spinning up.
#5 determines whether N is 6 or 12.  With only two drives, you
shouldn't have to worry about this.

> 6. Disable SCSI Parity Check

  Don't -- and enable it at the controller.

David G

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