Rocstor BigRoc Desktop Mini SAS RAID 1U Rack Mount System (R1S1XX-4B) Supports current SAS/SATA II/III RAID compliant hard drives, fully backward compatible with SATA 1.0 and SATA 1.0a compliant hard drives Provides JBOD, RAID 0 (Striping), RAID 1 (Mirroring), Span, Clone, RAID 5, RAID 10 (1+0) Supports Automatic Rebuild in Raid 1+HotSpare, Clone + Hot-Spare Monitors system status via LED indicators Features a tray-less function, by inserting in the hard 3.5 hard drove user-friendly design enables effortless hard drive hot-swapping Dissipates heat efficiently - Maximizes airflow with fans and mechanical designs RAID requires SAS support (connector Mini SAS) and system requirements: Mac OS 10.5 or higher, PowerPC, Mac OS X 10.4, Intel Core Duo Microsoft, Windows 2000, XP, Vista, Windows 7, 8 Bigroc series tray-less device utilizes the simplicity of hard drive installation and removal. The Hard drive can be slide into the unit by simply pushing the drives gently into its slot; and can be removed by simply pulling a lever above the hard drive. This enables flexibility in removal and insertion of the hard drives with ease