DoubleSpace was the original name of the disk compression software that was supplied with MS-DOS starting from version 6.0. The purpose of DoubleSpace was to increase the amount of data the user could store on disks, by transparently compressing and decompressing data on-the-fly. It was primarily intended for use with hard drives, but use for floppy disks was also supported.
DoubleSpace was not the first program of its class. For instance, Stacker from Stac Electronics had existed for years as an add-on product. Microsoft's decision to create DoubleSpace and add it to MS-DOS was probably influenced by the fact that DOS-based operating systems from other manufacturers (IBM and Novell) had started including disk compression software in their products.
A few computer programs, particularly games, were incompatible with DoubleSpace because of the way they accessed the disk: in effect bypassing the DoubleSpace driver. DoubleSpace also consumed a significant amount of conventional memory, making it difficult to run memory-intensive programs.
Some users reported data loss believed to be caused by DoubleSpace. Some of these cases were attributed to cases where the memory used by DoubleSpace was corrupted by other programs, and Microsoft attempted to remedy this in the MS-DOS 6.2 version of DoubleSpace. Another situation that led to data loss was the accidental deletion of the file on the host drive that contained the compressed data: in effect, a user could delete all his/her data by deleting just one file.
Another problem was attributed to users turning off their computer before DoubleSpace had finished writing a "virtual file" back to the file DBLSPACE.000. This was compounded by Microsoft concurrently releasing an option that allowed the MS-DOS prompt to reappear for use before MS-DOS had finished writing a file back to disk.
DriveSpace 3 also shipped with Windows 95 OSR2 but many features were disabled unless Plus! was also installed, also DriveSpace could not be used with FAT32 making it of little use on PCs with large hard drives.
Word is that Microsoft Corp.'s new MS-DOS 6.0 operating system software has several glitches - enough to cause some dealers to warn customers not to use certain features. (DoubleSpace file compression function said to malfunction) (News Bytes)
May 24, 1993; Word is that Microsoft Corp.'s new MS-DOS 6.0 operating system software has several glitches - enough to cause some dealers to...
DOS 6.0 and beyond. (overview of 12 DOS 6.0 and third-party program evaluations) (Symantec's Norton AntiVirus 3.0 and Norton Backup 2.2 for DOS, Central Point's Backup 7.1 for DOS and Windows and Anti-Virus DOS 1.4 and Anti-Virus Windows, Fifth Generation's Fastback Plus 6.0 and Untouchable 1.13, Qualitas' 386MAX 6.0, Microsoft Corp.'s MemMaker and DoubleSpace, Quarterdeck's QEMM 6.0, Stac Electronics' Stacker 3.0 for Windows and DOS, and Integrated Information Technology's XtraDrive 3.0) (Software Review) (includes product directory and related article on Novell DOS 7.0 and IBM DOS) (Evaluation)
Aug 01, 1993; Product LISTING MS-DOS 6.0 Microsoft Corp. One Microsoft Way Redmond, WA 98052-6399 1-800-426-9400; (206) 882-8080 FAX: (206)...
Judge formally orders Microsoft pull store shelves copies of DOS with DoubleSpace. (Originated from Knight-Ridder Newspapers)
Jun 10, 1994; SAN JOSE, Calif. _ A federal judge has formally ordered Microsoft Corp. to pull from store shelves copies of its MS-DOS operating...