EZTape Hangs or Generates Error with Compressed Drive (97848)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q97848
This information applies to both Microsoft DoubleSpace and Microsoft DriveSpace. For MS-DOS 6.22, use DRVSPACE in place of DBLSPACE for commands and filenames.


When you run Irwin Magnetic Systems' EZTape for MS-DOS, version 2.22 or version 3.1, on a DoubleSpace-compressed drive, the following problems may occur:
    EZTape may stop responding (hang) when performing a backup or restore on the DoubleSpace-compressed drive. -or-

    EZTape may display one of the following error messages when performing a backup or restore on a compressed drive:
      Run-time error R6001 null pointer assignment
      EMM386 exception error #12, enter to reboot computer


EZTape for MS-DOS version 2.22 or 3.1 may identify a DoubleSpace- compressed drive as a nonstandard drive and may require that the DOSONLY environment variable is set before you can begin an action ona compressed drive.


To work around this problem, set the MS-DOS environment variable to DOSONLY=1 before you use EZTape for MS-DOS.

To do this, using MS-DOS Editor (or another ASCII text editor), insert the following statement in the AUTOEXEC.BAT file:


Setting the DOSONLY environment variable forces EZTape for MS-DOS to use standard MS-DOS system calls to access the drive. You must reboot your computer for this change to take effect.

NOTE: The DOSONLY environment variable should not be necessary for use on uncompressed drives. For more information, contact Irwin Magnetic Systems Technical Support.

EZTape for MS-DOS is manufactured by Irwin Magnetic Systems, Inc., a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Modification Type: Major Last Reviewed: 11/23/1999
Keywords: KB97848