To: opendos AT delorie DOT com
X-Comment-To: "Arkady V.Belousov" <ark AT belous DOT munic DOT msk DOT su>
Cc: i812 AT iname DOT com
References: <20010314002926 DOT B3024 AT sl7>
    <2 DOT 07b7 DOT 14Z6R DOT GA6TFH AT belous DOT munic DOT msk DOT su>
Message-Id: <2.07b7.5D6M.GA70VD@belous.munic.msk.su>
From: "Arkady V.Belousov" <ark AT belous DOT munic DOT msk DOT su>
Date: Wed, 14 Mar 2001 18:11:37 +0300 (MSK)
Organization: Locus
X-Mailer: dMail [Demos Mail for DOS v2.07b7]
Subject: Re: [ot] disk geometry mismatch?
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Reply-To: opendos AT delorie DOT com

X-Comment-To: Arkady V.Belousov

Hi!

14-ํมา-2001 15:30 ark (Arkady V.Belousov) wrote to opendos AT delorie DOT com:

AB> This picture from diskedit better to slightly modify by swapping heads and
AB> tracks:
AB>   0 1 1    203 15 63          63    205569
AB> ____^
AB> 204 0 1   1022 15 63      205632    825552
AB> This disk pointed in BIOS setup as 1023/16/63.

     Note: sectors counted from 1 whereas head and cylinders counted from 0.
Consequently, 1..63 gives 63 sectors and 0..15 gives 16 heads.


14-ํมา-2001 15:37 ark (Arkady V.Belousov) wrote to opendos AT delorie DOT com:

RM>> I looked at the 4GB limit part, but although this drive is >4GB that
RM>> does not seem to apply.
AB>      BIOS limit is 8Gb, not 4Gb.

     I read Steunebrink's page and now see what meant by "4Gb limit". :)
Yes, there exist probabality that two your BIOSes translates your more than
4Gb disk differently (to deceit BIOS based OSes). B-\

RM>> This is a 15-head drive, but from reading that I
RM>> understand that the 4GB limit only applies to 16-head drives.

______________O\_/_________________________________\_/O______________
It appears that DOS and Windows 95/98 are limited to 255 Heads.
A translated geometry of 256 Heads will therefore create a problem.
This can happen when a drive has 16 Heads and more than 8192 Cylinders (>
4032 MB).
_____________________________________________________________________
              O/~\                                 /~\O

Your disk have more than 4Gb, so this comment applicable to your disk.