Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!oliveb!amiga!cbmvax!jesup
From: jesup@cbmvax.UUCP (Randell Jesup)
Newsgroups: comp.sys.amiga
Subject: Re: 15 Head Hard drive and the A2090(a)
Message-ID: <6938@cbmvax.UUCP>
Date: 19 May 89 22:10:45 GMT
References: <1735@dciem.dciem.dnd.ca> <680@dialog.UUCP> <040b02ba29ZN01@amdahl.uts.amdahl.com>
Reply-To: jesup@cbmvax.UUCP (Randell Jesup)
Organization: Commodore Technology, West Chester, PA
Lines: 19

In article <040b02ba29ZN01@amdahl.uts.amdahl.com> kevin@amdahl.uts.amdahl.com (Kevin Clague) writes:
>The 2090A's biggest problem is it's poor documentation.  Nowhere in
>the dos do they tell you that the only specs that matter with a
>SCSI device is block size and number of blocks.  You can factor out
>the number of blocks on the device into
>the number of heads, number of blocks per track and number of
>cylinders any way you want.
>
>I went so far as to try 1 head, 1 block per track, and some
>huge number of cylinders for my Quantum 80S drive.  It worked fine.
>Seems kinda silly though.

	Almost correct.  The current A2090(a) driver doesn't deal
properly with >127? >63? (I can't remember at the moment) blocks per
track.  So 3 heads, 50 blocks/track works, but 1 head, 150 blocks/track
doesn't.

-- 
Randell Jesup, Commodore Engineering {uunet|rutgers|allegra}!cbmvax!jesup