MS-DOS: Making a Bootable DoubleSpace Floppy Disk (97455)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.0
This article was previously published under Q97455
This article lists the steps necessary to make a bootable DoubleSpace-
compressed floppy disk.
NOTE: This procedure works on 720K, 1.2-MB, and 1.44-MB disks only.
Steps to Create a Bootable Floppy Disk with DoubleSpace
• Format a floppy disk in drive A using the following command:
format a: /s
• Run DoubleSpace and compress the floppy disk in drive A. For
example, type dblspace /compress a:
at the MS-DOS command prompt, and then press ENTER.
• After DoubleSpace finishes compressing the disk, it mounts the
disk. Run DBLSPACE /LIST to determine which drive is the host drive.
• Delete the READTHIS.TXT from the host drive. For example, type del
h:\readthis.txt at the MS-DOS command
prompt and then press ENTER.
• Copy COMMAND.COM to the host drive. For example, type copy
c:\command.com h:\ at the MS-DOS
command prompt and then press ENTER.
• Using MS-DOS Editor, create a DBLSPACE.INI file on the host drive
with the following lines in it:
MaxRemovableDrives=<number of floppy drive on your system>
FirstDrive=<one letter greater than the last drive letter used>
LastDrive=<five letters greater than the last drive letter used>
NOTE: DBLSPACE.BIN reads the DBLSPACE.INI file from the floppy disk,
and ignores any DBLSPACE.INI files on the hard disk drive. Therefore,
any ACTIVATEDRIVE= lines in the DBLSPACE.INI file on the hard disk
drive aren't processed, and the corresponding compressed volume file
(CVF) on the hard disk drive isn't mounted. Thus, data stored in that
CVF is inaccessible. To work around this situation and ensure access
to other compressed drives, add an additional ACTIVATEDRIVE= line for
each compressed drive to the DBLSPACE.INI file on the floppy disk. For
WARNING: If you edit the DBLSPACE.INI file, be sure you do not have
FirstDrive= set to a letter used by a physical or logical drive (such
as drive C). Also, do not set the LastDrive= and FirstDrive=
statements to drive letters that are more than 13 letters apart.
• Delete the MS-DOS system files on drive A. (These files are not
required on the compressed volume.) To do this, type the following at
the MS-DOS command prompt, pressing ENTER after each line:
The disk is now bootable. The CVF on the floppy disk now mounts
automatically when you restart your computer with this disk in
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