On Sat, 6 May 2000, Minh Van wrote:
> i have a maximum of 7 devices, ultra scsi card here, and i'm trying to
> figure out what some of the differences are between scsi hard disks.
> there're ultrawide scsi & the 50-pin scsi hard disks that i know of. i
> don't know what type of disk to buy. afa i can see, my card came out of
> the box with an included 50-pin ribbon. so i suppose i'll buy 50-pin scsi
> disks ?
OK - your basic types of SCSI are pretty much like this {some of the
fiures might be wrong - but you'll bet the idea}.
SCSI - also known as SCSI1 - up to 7 drives, 50 pin connector, 5 Mb/s
transfer speed
SCSI2 - 7 drives, 50 pin connector, 10 Mb/s transfer speed.
Ultra SCSI - 7 drives, 50 or 68 pin connector, 20 Mb/s transfer speed
Ultra Wide SCSI - 14 drives, 68 pin connector, 40 Mb/s transfer speed
Ultra Wide LVD SCSI - 14 drives, 68 pin connector, 80 Mb/s transfer speed
Most standards are backward compatible - except LVD, which will actually
run on a normal Ultra SCSI card, just slower.
So your Ultra SCSI card will run SCSI, SCSI-2 and Ultra SCSI drives - but
_NOT_ Ultra Wide or LVD drives. Since you can;t buy Ultra SCSI drives for
love nor money these days, your options are really second hand, or upgrade
your SCSI controller.
> i've also been told that i can use ultrawide adapters to use with
> ultrawide scsi hard disks. i want to know what these ultrawide adapters
> are, and how do i use them with my ultra scsi card if that is possible.
Nope. Can not be done. Been there, done that, got the T shirt. Oh, you can
get cable adapters - at around $60 a pop, from CX computers and maybe a
couple of other places - but the Ultra Wide drives will _NOT_ run on the
Ultra controller. All you're doing buying the adapters is wasting your
money. The adapters are intended for situations where strange
manufacturers make drives wit hthe wrong connector - Apple are one who do
it, some of the "Unix" companies also.
DaZZa
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