Mode switching from LBA to CHS and back

[Anamika]

Just want to tell my experience here.
I have a WD 220000 disk and was trying to add an extra disk to the
machine. While in the process of doing so, the disk somehow got
switched from LBA to CHS in the BIOS setup. It might be my mistake.
Afterwards, windows would not boot. Switching back the disk to LBA in
BIOS would not work, including manual editing of the CMOS fields.
Then tried to repair the disk using resqdisk, diskman4. These
tools refused to read the disk partition table. Probably because of
the LBA to CHS switch. Then tried mounting in Linux and used 'parted'
to change the mode to 'LBA'. No cigar. Still no boot windows.
After that attached another disk (21200) to IDE2 and tried boot.
Strange thing was, the new disk was switched to CHS only when used
with the problem disk. By switching around these two disks on a
different machine and also using BIOS IDE HDD detection, again and
again, was able to switch the 22000 back to LBA mode. Took a lot of
persuading to do that. Somehow having the second disk as primary
master and the problem disk as secondary master helped to switch the
22000 back to LBA mode.
Now the 22000 is switched back to LBA mode and booting windows.

-A

 

[Barry OGrady]

Just want to tell my experience here.
I have a WD 220000 disk and was trying to add an extra disk to the

Going by WD model numbers, you must have a 22,000 gig hard drive!

machine. While in the process of doing so, the disk somehow got
switched from LBA to CHS in the BIOS setup. It might be my mistake.
Afterwards, windows would not boot. Switching back the disk to LBA in
BIOS would not work, including manual editing of the CMOS fields.
Then tried to repair the disk using resqdisk, diskman4. These
tools refused to read the disk partition table. Probably because of
the LBA to CHS switch. Then tried mounting in Linux and used 'parted'
to change the mode to 'LBA'. No cigar. Still no boot windows.
After that attached another disk (21200) to IDE2 and tried boot.
Strange thing was, the new disk was switched to CHS only when used
with the problem disk. By switching around these two disks on a
different machine and also using BIOS IDE HDD detection, again and
again, was able to switch the 22000 back to LBA mode. Took a lot of
persuading to do that. Somehow having the second disk as primary
master and the problem disk as secondary master helped to switch the
22000 back to LBA mode.
Now the 22000 is switched back to LBA mode and booting windows.

-A

-Barry
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