DoubleSpace: Serious Disk Error Occurred Writing to Drive <x> (95958)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.0

This article was previously published under Q95958


When you install DoubleSpace on a hard drive, DoubleSpace creates a compressed volume file (CVF), but when DoubleSpace runs Defragmenter (Defrag), you receive the following error message:

ATTENTION: A serious disk error occurred writing to drive x:
where x is the drive you are compressing. There are no options at this point other than restarting the computer.

When you restart the computer, DoubleSpace recovers and completes the installation. DoubleSpace ignores any clusters marked as unusable in the file allocation table (FAT).


Your hard drive has physical errors (such as unusable sectors).


Run a disk repair utility such as Norton Disk Doctor (NDD) before you compress the drive.

Norton Disk Doctor is manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Modification Type: Major Last Reviewed: 11/26/1999
Keywords: KB95958