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 Q95861


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.

The RAMDRIVE.SYS line in the CONFIG.SYS file should precede the DBLSPACE.SYS line or the RAMDrive will receive a different drive designation from what it was before. This can become a problem if you have many batch files referencing the RAMDrive. For example, if your batch files reference drive D and it becomes drive I after DoubleSpace is installed, your batch files will not work.


The drives used for DoubleSpace are selected from the last available drive rather than the first available drive. If RAMDRIVE.SYS precedes the DBLSPACE.SYS line, then the RAMDrive's drive letter comes right after the last physical drive. For example, if you have a drive C and a floppy disk drive A, then the RAMDrive is assigned the letter D.

If the RAMDRIVE.SYS line comes after the DBLSPACE.SYS line, DoubleSpace has already allocated all the drive letters between drive C and its host drive (probably drive H) so the RAMDrive is assigned letter I.

For information on how DoubleSpace assigns host drive letters, query on the following words in the Microsoft Knowledge Base:

doublespace and assigns and host

For more information on RAMDrive, type help ramdrive.sys at the MS-DOS command prompt and press ENTER.

Modification Type: Major Last Reviewed: 11/16/1999
Keywords: KB95861