I did a Windows 95 upgrade from 3.11 on a Pentium 75 machine which had a
1GB Fujitsu IDE hard drive and I got the little yellow exclamation point
in the device manager over the primary IDE controller. This resulted in
Windows 95 using MS-DOS compatibility mode on the C drive. Config.sys is
empty and autoexec.bat just has a "PATH" command. The device manager did
not list any driver as being the culprit.
I used a procedure suggested by Fujitsu to zap the partition table on the
drive and repartitioned and reformatted it. I then reloaded Windows 3.11
and then did the upgrade to Windows 95. I still had the yellow exclamation
point. The IOS.LOG file says:
ESDI head mismatch
Unit number 02 going through real mode drivers
Can somebody tell me exactly what this means and how to go about fixing it?
I am not afraid to blow away everything on the disk. Also, if the fix is
to upgrade the BIOS, how do I go about figuring out who the motherboard
manufacturer is? I visited the amibios web page and it listed a number
of international vendors based on part of the string the BIOS prints out
at boot time and I couldn't match my string against their list.
By the way, I've already read article Q130179 in the Microsoft Knowledge Base
("Troubleshooting MS-DOS Compatibility Mode on Hard Disks") whose title
sounded promising but wasn't able to solve my problem.
Init failure esdi_506.pdr
Init success esdi_506.pdr
Presumably the first pair is for the primary IDE and the second pair is for
The BIOS is AMIBIOS and it's banner reads
P5I437 BIOS V1.4 1995-11-06
and at the bottom it reads
The chipset seems to be an Intel SB82371FB (PIIX) and SB82437FX, but it seems
not to be an Intel board. There are no visible company markings on the board
(which is marked "Made in China"). It is not possible for me to contact
the original vendor since the machine belongs to my son's school and the
person who purchased the machine is no longer there and nobody else knows
where the machine came from.
The BIOS is set to autodetect the drive which is the master on the primary
IDE controller. The BIOS reports:
Cyl Hd Sec Size
Primary master C 2114 16 63 1040MB LBA ON 32-bit Block mode PIO
mode on 16 sec mode 4
The disk drive is a Fujitsu M1614TAU manufactured May 1996.
Thanks for any advice you can give.