Windows 9X fdisk and format
Commands Report the Size of Hard Disk Drives Greater Than 64 GBytes Incorrectly
Last updated: 6/1/04
Q. Why do Windows 9x fdisk and format
commands executed at the DOS prompt report hard disk drives that
are larger than 64 GBytes as much small drives?
A. "quig" reports that fdisk sees
an IBM 82 GByte drive as just under 13 GBytes. I have been having
the same problem with 80 gig WD drives... According to MSKB Q263044,
the reason is that fdisk for:
Microsoft Windows 98 Second Edition
Microsoft Windows 98
Microsoft Windows 95
... uses some 16-bit values internally to calculate
the size of the drive and some of the variables overflow when the drive size
is equal to or larger than 64 GBytes. According to MS fdisk reports
the full size of drive that is greater than 64 GBytes as the actual size
minus 64 GBytes.
Which in "quig's" case would be 18 GBytes
and in mine 16 GBytes? As I recall I was getting a little over 10 GBytes. This download fixed
It will not work with 48-bit logical block addressing
(LBA) hard disks, and it is not supported on hard disks larger than 137 GB.
Free FDSK works with larger drives and may be an easier solution.
My version (3.0) of Partition Magic reports it
Also, the same person probably wrote the fdisk
and format programs because both programs have the same problem. As
reported in MSKB Q263045, the problem with format "is a display (or
cosmetic) issue only; the drive is formatted to its full size." There
is no fix. Also, the problem does not occur if the drive is formatted
with the Windows Explorer.
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