Converting Stacker-Compressed Removable Disks (95348)


The information in this article applies to:

  • Microsoft MS-DOS operating system 6.0
  • Microsoft MS-DOS operating system 6.2
This article was previously published under Q95348

SUMMARY

To convert a Stacker version 2.x or 3.0 compressed floppy disk to a DoubleSpace-compressed disk using the Conversion Disk for Users of Stacker, you must have approximately 900 kilobytes (K) of free disk space on the floppy disk. To convert a Stacker-compressed removable media disk (such as Bernoulli disks and removable optical disks), you must have approximately 1 megabyte (MB) of free disk space on the removable disk. The free disk space can be either at the end of the Stacker volume file (SVF) or on the uncompressed portion of the disk.

If you do not have enough free disk space to compress a removable disk and you cannot remove any files to create more free disk space (or the disk capacity is less than 900K [360K or 720K]), use the procedure below, which was taken from the README.TXT file.

MORE INFORMATION

DoubleSpace requires 900K free disk space so that it can create a 512K DoubleSpace compressed volume file (CVF). DoubleSpace also requires 400K- 500K free disk space so that it can internally defragment a highly fragmented SVF.

If DoubleSpace cannot convert a Stacker-compressed volume file due to disk space limitations, do the following:

  1. Insert the floppy disk in drive A or B.
  2. Copy the STACVOL.DSK file to the host drive on your hard disk. If you don't know which drive is your host drive, type dblspace /list at the MS-DOS command prompt and then press ENTER.

    When you copy the file, change its extension to .001. For example, if the floppy disk is in drive A, and your host drive is drive D, type the following at the MS-DOS command prompt and press ENTER:

    copy a:\stacvol.dsk d:\stacvol.001

    If you have insufficient disk space, start DoubleSpace by typing dblspace at the MS-DOS command prompt, and choose Change Size from the Drive menu. Make the size of the uncompressed drive large enough to contain the SVF.
  3. Covert the compressed volume file to DoubleSpace format, as in the following example:

    dblspace /convstac=d:\stacvol.001

    After DoubleSpace converts the file, it mounts the file.
  4. If are using Stacker version 2.0, delete the STACKER.DRV file on the floppy disk. If you are using Stacker version 3.0, delete the STACKER.EXE and README.STC files.
  5. Delete the STACVOL.DSK file on the floppy disk.
  6. Make sure your floppy disk is in drive A or B and then compress it by choosing Existing Drive from the Compress menu in DoubleSpace. Follow the instructions on your screen.

    DoubleSpace mounts the floppy drive after it finishes compressing the floppy disk.
  7. Quit DoubleSpace.
  8. Use the XCOPY command to copy all the files on the new compressed drive on your hard disk to the compressed floppy disk. For example, if the compressed drive is J, and the floppy disk is in drive A, type the following at the MS-DOS command prompt and then press ENTER:

    xcopy j:\*.* a: /s

  9. Delete the compressed drive on your hard disk. For example, if your compressed drive is J, type the following at the MS-DOS command prompt and press ENTER:

    dblspace /delete j:

    To confirm the deletion, type Y.
Modification Type:MajorLast Reviewed:10/15/2003
Keywords:KB95348
©2003 Microsoft Corporation. All rights reserved.