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From: Peter.Fitzsimmons@p1.f628.n250.z1.FIDONET.ORG (Peter Fitzsimmons)
Newsgroups: comp.os.os2
Subject: Re: HPFS
Message-ID: <332.25C82A5A@weyr.FIDONET.ORG>
Date: 30 Jan 90 02:30:20 GMT
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 > EID:d714 1439abc0
 > MR>low-level than an IFS.  I've used RLL (Western Digital
 > MR>WD1006) and
 > MR>ESDI controllers (WD1007) without any problem.
 > 
 > 
 > I wonder how well non-standard (greater than 1024 cylinders) drives 
 > ouldwork under OS/2.  I hope we all don't have to go through 
 > heSpeedstor/diskmanager/etc. like with DOS.

I have a Miniscribe 3180E (150mb) that I use with the WD1007 (esdi)
controller.  The 3180E is more than 1024 cyls (1250 i think).  I
tossed the diskmanager s/w, and used the WD1007's ability to remap
the cyls by making the drive look like it has 16 heads.  (This is
the way the ps/2's work too).  My bios, and os/2, think that the
drive has 294 cyls, 16 heads and 63 sectors per track.  Performance
did not suffer at all (CoreTest 2.8 gives it an 8.4 rating).


 > I imagine that OS/2 is just going to take the drive type which is in ROM 
 > anduse it.  But if the drive doesn't match any ROM type (as in an old 
 > AT) thenI would suspect problems.

Since I used the WD1007's bios to low-level format the drive (use
G=C800:5 in debug to get the menu), and *it* knows how big the drive
really is, the "type" in your CMOS ram is not important.  Since
c=294, h=16, spt=63 is not in my bios drive tables, I simply choose
"type 1".  OS/2 and DOS will read the drive paramaters from
partition table, not from CMOS.

I am using IBM SE 1.20 on a 386/25 clone.


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Peter Fitzsimmons - via FidoNet node 1:140/22
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