Err Msg: Invalid Device Request Reading Drive...

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Article ID: 90784 - View products that this article applies to.
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If you use SuperStor version 1.3 by AddStor with the Microsoft Windows 3.1 SMARTDRV.EXE file, you may receive the following error message:
Invalid device request reading drive c
and your system may stop responding (hang).


SuperStor loads a device driver called SSTORDRV.SYS in the CONFIG.SYS file, and optionally loads DEVSWAP.COM, which swaps the physical drive letter for the compressed drive.

Versions of SuperStor earlier than 1.3h do not work with SMARTDrive version 4.0. When SMARTDrive loads, it "unloads" the SuperStor driver, making the compressed drives unavailable. Versions 1.3h and 1.3i correct this problem.


To work around this problem, use the following steps:

  1. Restart your computer with a bootable floppy disk in drive A.
  2. Create a CONFIG.SYS file on the bootable floppy that contains the SuperStor driver, SSTORDRV.SYS.
  3. Restart your computer again using the bootable floppy disk in drive A. This should allow you to access the compressed volume of your SuperStor drive.
  4. Open the AUTOEXEC.BAT file in a text editor and remove the SMARTDRV.EXE line.


SuperStor is a disk-compression program, similar to Stacker, that can increase the storage capacity of hard, floppy, and virtual disks. SuperStor is manufactured by AddStor, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.


Article ID: 90784 - Last Review: February 28, 2014 - Revision: 2.0
  • Microsoft Windows 3.1 Standard Edition
  • Microsoft Windows 3.11 Standard Edition
kbnosurvey kbarchive KB90784

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