DoubleDisk (1991) 2 Utility DOS

First released in 1989, DoubleDisk was the first real-time drive compression product for DOS. It is a fairly no-frills program and sticks to what it does best. It was relatively low cost compared to its later competitors. and Expandz! Plus

• 2.5
• 2.6

Vertisoft SpaceManager (1993) 0 Graphics DOS Windows

SpaceManager, from Vertisoft, the authors of DoubleDisk which became Microsoft DoubleSpace, is a utility that adds more features to DoubleSpace. It adds access to additional compression methods to get better compression at the expense of CPU speed, can bypass compression for files that do not compress well, automatically schedule a drive recompression, automatically mounts compressed floppy disks, and shows drive usage details and compression statistics.

• 1.5x