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From: bote@csense.UUCP (John Boteler)
Newsgroups: comp.unix.xenix
Subject: Re: XENIX 2.2.3 and >1024 h.d. cylinders: possible?
Message-ID: <359@csense.UUCP>
Date: 15 Sep 89 18:45:19 GMT
References: <5563@seac.UUCP>
Organization: Common Sense Computing, McLean Va
Lines: 28

From article <5563@seac.UUCP>, by wain@seac.UUCP (Wain Dobson):
> SCO is quite clear that SCO UNIX 3.2 does not support greater than 
> 1024 cylinders. If you want to use a drive that has greater than
> 1024 cylinders, then you ought to purchase a controller such as, the
> WD1007 or DTC 6280 (ESDI) if you are running ESDI, and have
> the controller bios redefine the disk parameters (cylinder,head,sectors)
> which SCO uses.

Agreed, those controllers will provide the means to low-level
format the drive throughout its data surface. But then the
responsibility falls on the OS to use that surface; and SCO
Xenix Releases 2.2.3, 2.3.1, 2.3.2, and SCO UNIX 3.2 have all 
successfully been installed on a drive with 1166 cylinders using 
both DTC5287 and DTC7287 ( 1:1 interleave ) disk controllers. 
Other drives with > 1024 cylinders have successfully been installed 
under similar hardware environments. 

`dparam /dev/rhd0a`  prints:

1166 7 0 65535 0 0 1166 26 

This is on a working system. 

John Boteler
uunet!cyclops!csense!bote

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