drvspace.bin

drvspace.bin is the part of ms-dos that provides access to your compressed drives(Disk).
( compressed using drivespace)

- Before carrying out the commands in your CONFIG.SYS and AUTOEXEC.BAT files

drivespace (RVSPACE)

Setup compresses your hard disk drive
loads DRVSPACE.BIN into memory

without parameters:

lists your compressed drives and provides menu commands for working with them