[Gllug] SCSI Hard Drives

[Jackson, Harry]

> -----Original Message-----
> From: tet at accucard.com [mailto:tet at accucard.com]
> 
> >I also find it a bit odd that the seagate LC uses 80 pins rather than
> >68 and I cannot be arsed looking for adapters.
> 
> Nothing odd about it, just different connectors. The Seagate uses an
> SCA2 connector, which integrates power and data, so you only need to
> connect one cable to your drive. Quite why the world didn't go this
> way ages ago is beyond me. Those of us coming from a Unix workstation
> background are continually amazed at how primitive PC hardware is.
> Changing a hard drive on a SPARC is typically a 30 second job. Compare
> that with doing the same on a PC... Some PC servers (e.g., from Dell,
> Compaq, etc.) are starting to use SCA drives, but the 
> mainstream isn't.
> 
> BTW, Micro Anvika on TCR sell SCA to 50/68 pin internal SCSI adapters.
> I think the last one I got was 14 quid.
> 
> >I also noticed that on the technical pages the equivalent 
> > seagates had 4
> >physical heads and two disks whereas the Fujitsu had 2 heads 
> >and one disk. How does this affect the disk??
> 
> Although I haven't checked the specs for these particular drives, more
> platters typically means lower latency.

Just out of interest, do the normal 68 pin SCSI cards cater for this draw on
power if you are using SCA devices. If your card takes 15 devices then this
is quite a lot of juice to be drawing through a motherboard and card. Just
checked the specs and the latency is the same. I would have thought there
would be some performance gains with multiple heads but obviously not all
the time.

Harry


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