the cartridge contains 512kB of FlashROM memory , also DOS 2.20 is contained in the FlashROM. Currently the IDE bios supports harddisks, CD-ROM, ZIP drives and the LS120 drive.
Speed with a MSX2/+ 3.58 MHz
Normal floppy: 9 kB/s
Harddisk: 151 kB/s
IOMEGA ZIP: 113 kB/s