They're 68-pin.  I'd actually been attracted by a deal on 9GB SCA drives,
but when I saw I could get the 18GBs for the same price/GB and not need the
80/68 adapters, I went for that option instead.

  Semi-related:  None of my local component stores seem to carry bay coolers
any more....

Dve Gillett


On 1 Sep 2004 at 1:37, Bill Cohane wrote:

> At 00:12 09/01/04, David Gillett wrote:
> >It has been a couple of years since I updated the hardware on
> >one of my machines, which has an on-board Adaptec UW ("SCSI III")
> >controller. I recently took the opportunity to grab a good deal
> >on a couple of 18 GB SCSI drives which turn out to be designed
> >for "Ultra 160 LVD" operation.
> >
> >One of the jumper positions is to switch between LVD and "Single
> >End" mode, and I have an impression that the latter mode may
> >allow them to be added to the UW bus of my existing controller.
> >
> >Can anyone who is more current with SCSI than I am confirm this?
> >Or even convince me that it can't work, and that I need to shop
> >for an LVD controller board....
>
>
> Hi David
>
> All LVD drives will automatically drop down to SE mode if any SE
> device is added to the SCSI bus. So your drives should run fine
> on an Ultra Wide (single ended) SCSI controller. You shouldn't
> even have to set that "single ended" jumper. That jumper is there
> should you want to force an LVD bus to drop down to SE mode in
> the absence of any SE devices.
>
> The disadvantage of using a single ended controller is of course
> that the bandwidth for UW is only 1/4 that of Ultra160. If your
> drives are 10K RPM (or faster), you might lose some performance
> by running them on an SE controller because of the lower
> bandwidth. Also, maximum allowed cable length for UW SCSI is
> only a fraction of the allowed cable length for LVD SCSI.
>
> Are your two 18 GB drives 68 pin or 80 pin (SCA) drives? One
> thing to watch out for is that many 68 to 80 pin SCA converters
> meant for LVD drives do not work properly if the drives try to
> run in SE mode.
>
> Regards,
> Bill
>
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