This article was previously published under Q124558
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You receive the following error messages when you run DriveSpace to performan operation that requires full restartability:
Files required to manage your compressed drive(s) are missing on drive <x>. To restore these files, copy the MINI.CAB file from your Windows 95 Setup Disk 1 or CD-ROM into your Windows directory. The next time you run DriveSpace, the missing files will be restored.
ID Number: DRVSPACE575
Windows might not be able to restart this operation if it is interrupted. Check to make sure drive x is not full; you may need as much as 1.5 MB of free space to continue.
ID Number: DRVSPACE311
These errors occur when the files in the hidden FAILSAFE.DRV\FAILSAFEdirectory on drive C (or the host for drive C) are missing and DriveSpacecannot find the MINI.CAB file in your Windows 95 SYSTEM subdirectory.
These errors can also occur if there is a file named Failsafe.drv in theroot folder of drive C (or the host for drive C).
Copy the MINI.CAB file from your original Windows 95 distribution media toyour Windows 95 SYSTEM subdirectory.
NOTE: MINI.CAB is located on the standard 1.44-megabyte (MB) disk 1 of the3.5-inch distribution media format (DMF) disk set and can be copied usingWindows Explorer or at an MS-DOS prompt (using EXTRACT is not necessary).On CD-ROM installation media, MINI.CAB is located in the WIN95 directory.
DriveSpace operations that can prevent Windows from restarting properly ifinterrupted by a power loss or accidental reboot are fully restartable. Toensure restartability in these cases, DriveSpace uses a mini-version ofWindows (a subset of Windows 3.1 also used by Setup).
DriveSpace extracts the mini-version files (from the MINI.CAB file in yourWindows 95 SYSTEM subdirectory to a hidden FAILSAFE.DRV directory on thephysical boot drive) before beginning an operation that requires fullrestartability. This ensures that DriveSpace can complete its operation inthe event of a power loss or accidental reboot.
DriveSpace requires the mini-version of Windows during the followingoperations:
Compressing an existing drive that contains Windows files (including the swap file).
Uncompressing a DriveSpace- or DoubleSpace-compressed drive that contains Windows files (including the swap file).
Changing the size of a DriveSpace- or DoubleSpace-compressed drive that contains Windows files (including the swap file).
Changing the estimated compression ratio (ECR) for a DriveSpace- or DoubleSpace-compressed drive that contains Windows files (including the swap file).
You should not delete the FAILSAFE.DRV directory created by DriveSpaceunless you have a MINI.CAB file in your Windows SYSTEM subdirectory.DriveSpace does not delete FAILSAFE.DRV after successfully completing arestartable operation. This allows future restartable operations to becompleted more quickly.