Article: 54846 of comp.sys.sun.hardware
From: cdewick@lios.apana.org.au (Craig Dewick)
Newsgroups: comp.sys.sun.hardware,aus.computers.sun,alt.sys.sun
Subject: Re: SS20 SCSI question
Date: 11 Apr 1999 10:25:20 +1000
Organization: Lios - Children of the Light - May the Schwartz be With You
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In <370FDB4F.93DD6966@sympatico.ca> clovitt@sympatico.ca writes:

>Please forgive me if this question is trivial - I'm a very new owner of
>a Sparc20 and looking to get a second
>hard drive.  It currently has a seagate 'Fast Wide SCSI-2' disk in it.

>My questions are can I safely add an Ultra Wide SCSI type disk (will the
>back-plane accept any 68 pin
>SCSI disk)?  I recognize that internal heating may be an issue but how
>much of a problem is it really?

You can't use 50 or 68 pin SCSI disks internally because the internal SCSI
bus is the 80-pin SCA-80 type. Externally you can use whetever you like with
the right cabling, adaptors, etc. I currently have a 4.5 gig SCA-80 disk
connected to the external SCSI port on a Sparc 10 with an adaptor from
"http://www.corpsys.com". I'll be connecting it to a SunSwift card as soon
as I get an external 68-pin SCSI case.

The major heating problems come from the CPU module(s). I have a Sparc 20
here with a pair of SM-71 CPU's and they get fairly warm. SM-81's get very
warm. If your case is the one that has the small fan unit retro-fitted
between the floppy/CD-ROM and hard drive bays, then you'll be ok. If it
doesn't have that additional fan, be careful what you put inside the case.

Do *not* use Quantum disks if heating is a concern. I use IBM drives almost
exclusively now because they are quiet, and don't heat up too much.

Regards,

Craig.
-- 
            Craig Dewick. Send email to "cdewick@lios.apana.org.au"
  Point a web browser at 'http://lios.apana.org.au/~cdewick/sun_shack.html' to
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