Path: utzoo!attcan!uunet!iscuva!ricks
From: ricks@iscuva.ISCS.COM (Rick Schaeffer)
Newsgroups: comp.sys.amiga
Subject: Re: Quantum SCSI drive and 2090
Keywords: Quantum SCSI 2090
Message-ID: <2157@iscuva.ISCS.COM>
Date: 13 Nov 88 07:12:48 GMT
References: <144@modcomp.UUCP>
Organization: ISC Systems Corporation, Spokane, WA
Lines: 51


I, too had problems getting the Quantum 80S to work with the 2090.  The
problem is really that Amigados's SCSI driver doesn't understand CCS
(Common Command Set) and the 80S is a little weird.  For instance, the
drive manual states that there are two "zones" on the drive.  The outer
zone has 35 sectors/track and the inner zone has 28 sectors per track.
Well...the amiga don't know about "zones" so how many sectors per track
do you tell prep that it has?  The answer is pretty much anything that
adds up to the specified total number of sectors (164,058)...with SCSI
controllers the cylinders/surfaces/sectors specifications are somewhat
superfluous since SCSI only needs to know what sector you want!

So...I used a lot of trial and error with a calculator (I'm *no* 
mathematician!) and came up with the following:
    Number of surfaces = 6
    Sectors per track = 31
    Number of cylinders = 882

This yields a total of 164,052 sectors.  I couldn't come up with any 
combination of the above that yielded 164,058.  Anyway...thats what
I told prep...and I also told prep that the first partition (which will
be dh2:) ended on cylinder 2.  My Mountlist entry for the main partition
looks like this:

FS1:	Device = hddisk.device
	FileSystem = l:FastFileSystem
	Unit = 3
	Flags = 0
	Surfaces = 6
	BlocksPerTrack = 31
	Reserved = 2
	Interleave = 0
	LowCyl = 3 ; HighCyl = 881
	Buffers = 192
	GlobVec = -1
	BufMemType = 1
	Mount = 1
	DosType = 0x444f5301
	StackSize = 4000
#

Since I thought to save others the hassle I went through (and also answer
the question to which this is the reply) I am posting this here rather
than sending email ... hope noone minds.  The above setup is working
dandy for me!  It bugs me a little to still be missing those last 6 sectors
but I'll survive :-).
-- 
Rick Schaeffer          UUCP:  uunet!iscuva!ricks
ISC Systems Corp.              ricks@iscuva.ISCS.COM
Box TAF-C8              Phone: (509)927-5114
Spokane, WA  99220