Tempo Ultra-ata/133 Raid Carddrive Contraoller for Pci Mac Compatible with Apple Power Macintosh G3 and G4 models Supports Mac OS 8.5 through 9.2.2, and OS X Allows Mac OS to boot from attached drives True hardware RAID level 0 (striping) supports up to two volumes (two ATA/IDE hard drives per volume, four drives total) Supports drive protocols through ATA6