The speed will be limited ONLY if the transfer rate the drive is capable of exceeding
the SCSI-2 FAST specifications. The SCSI interface sets an upper limit, but the actual
cabilities of the hard drive mechanism determines the actual transfer rates obtainable.
If this was an older design and the interface was merely upgraded to SCSI-3, chances
are it will not exceed the SCSI-2 FAST bus 10MB/sec. Very few of the early Ultra, Fast
& Wide or Ultra-Wide drives came remotely close to the limitations of the SCSI
interface spec. Before you invest in a new SCSI card, install the drive and benchmark
it - if the transfer rates are well below SCSI-2 limitations a faster interface will
not improve them. If you have exceed the # of devices for the existing bus or wish to
create a RAID array that is a different matter.
Gene Osburn wrote:
> > Does anyone know if the internal 50 pin "Fast SCSI 2" bus in a 7500 desktop
> > Mac will support a 50 pin Ultra SCSI 3 Hard Drive.
>
> The drive's data throughput will be limited by the SCSI 2 bus; it will work, but
> you'd be better off installing an Ultra SCSI controller card to serve as a dedicated
> bus for the new drive. You'll add support for up to seven internal and seven
> external *FAST* drives/devices. Spend a few bucks for an Adaptec 2930U; $99 retail,
> but just prowl ebay until you can steal one for ~$30 - a good investment if you
> intend to keep your 7500 in the family....
>
> --
> Gene, a.k.a. G-Man
> Friends don't let friends do Windows....
>
> ----------
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