Microsoft KB Archive/239119

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BUG: FDISK Reports Incorrect Disk Capacity for Certain PCMCIA / PCCARD ATA Drives

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Q239119

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The information in this article applies to:


 * Microsoft Windows 95
 * Microsoft Windows 98

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SYMPTOMS
FDISK, when run from an MS-DOS box after Windows has been started, reports the wrong disk size for PCCARD-based ATA drives that contain a storage capacity greater than 1023 cylinders. This issue generally applies to disk drives that do not appear in real mode prior to protected-mode Windows (this problem occurs, for example, with drives where the controller has no BIOS extension, so MS-DOS has no way of knowing that they exist).

CAUSE
A bug in the IDE device driver, Esdi_506.pdr, results in FDISK using INT 13 function 8 to obtain disk geometry information. This function truncates the cylinder count to a 10-bit value.

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

Additional query words:

Keywords : kbOSWin95bug kbOSWin98bug kbDSupport kbGrpDSWin9xDDK

Issue type : kbbug

Technology : kbWin95search kbWin98search kbWin95 kbWin98