FATSPEED II accelerates hard disks under TOS 1.0 and TOS 1.2 by up to 1000%, making each disk as fast as with TOS 1.4. With the old TOS versions, time is wasted when writing to disk mainly by organizing the FAT, less by writing itself. Especially with full disks (which disk is already empty?) write accesses became a real test of patience. FATSPEED II optimizes this and achieves amazing write times. A restore for backup files takes not 2 hours but 20 minutes, saving the desktop info 2 instead of 7 seconds, a full folder one instead of ten minutes (only useful for TOS 1.0 or TOS 1.2).