User manual

USB supports three data transfer rates:
• USB 2.0: A Hi-Speed rate of 480 Mbits/s (60 MB/s). All Rocstor devices are integrated with
USB 2.0, Hi-Speed.
• USB 1.1: A Full Speed rate of 12 Mbits/s (1.5 MB/s). All USB Hubs support Full Speed.
• USB 1.0: A Low Speed rate of 1.5 Mbits/s (187 KB/s)
Serial Advanced Technology Attachment (SATA) is a computer bus primarily designed for
transfer of data between a computer and storage devices (like hard disk drives or optical
drives).
The main benefits are faster transfers, ability to remove or add devices while operating (hot-
swapping), thinner cables that let air cooling work more efficiently, and more reliable operation
with tighter data integrity checks than the older Parallel ATA interface.
SATA 1.5 GB/s and SATA 3 GB/s
SATA is designed to be backward and forward compatible with future revisions of the SATA
standard.
External SATA
Maximum cable length is 6.6 Ft (2 meters). USB and FireWire allow longer distances.
This table shows the real speed of SATA 1.5 Gbits/s and SATA 3 GB/s:
SATA 1.5 Gbits/s SATA 3 Gbits/s
Frequency 1500 MHz 3000 MHz
Bits/clock 1 1
8b10b encoding 80% 80%
Bits/Byte 8 8
Real speed 150 MB/s 300 MB/s
BIGROC 5C – 4Bay RAID - 1U Rack Mount System - User Manual Page | 59