2 Identical Disk Drives are included. 2TB (2000GB) Total Capacity

Seagate Barracuda 7200.12 Series, 1TB 7200rpm with 32MB Cache.

• Perpendicular Recording - increases data density while decreasing moving parts for a more dependable drive.
• Adaptive Fly Height - offers consistent read/write performance from the beginning to end of your computing workloads.
• Seagate SoftSonic - SoftSonic motor enables whisper-quiet operation.
• Enhanced G-Force - Protection defends against handling damage.

Model no.:  Startech SAT3520U2ER

Specification:  3,5" 2x S-ATA to eSATA and USB 2.0
 
Connectors: 

• Internal: 2x 7 pin S-ATA
• External: 1x USB 2.0 connector
• External: 1 x eSATA connector

Operating system:  suitable for Windows XP & Vista, Windows 7,  Mac OS*

       *eSATA is not supported on all Macs 
 
Material/ Colour:  solid silver aluminium body / black plastic ends
Accessories: 

• USB 2.0 cable
• eSATA cable 
• High Quality external transformer power supply (100-240V)
• UK or Euro Power Lead  
  {We ship this to mainland Europe with a Euro power lead}

Dimensions 190 x 130 x 75 mm

RAID MODES:

Non-RAID (JBOD): The drives will show up as two independent drives.  When using eSATA in this mode only one disk is seen unless your PC has Port Multiplier (PM) Support in the SATA controller.

Big Disk Spanning: The two drives show up as one large single drive. Spanning is an array (not RAID) that is written sequentially across the two drives. By itself, it does not provide any performance or redundancy benefits.

RAID 0 - Striping: Used where speed is the primary objective, RAID Level 0 (also called "striping") is not redundant, and therefore does not technically conform to the definition of a RAID. This form of array splits each piece of data across both of the drives in segments; since data is written without any form of parity data-checking, it allows for the fastest data transfer of all other RAID levels. However, if one drive becomes damaged, the whole array can become corrupted.

RAID 1 - Mirroring:  A RAID 1 creates an exact copy (or mirror) of a set of data on the second drive. This is useful when reliability and backup are more important than data capacity. The available capacity to the user will only be as large as a single drive but when one of the hard drives fails, it can be replaced and the data rebuilt automatically.

The enclosure has an LED indication at the front to show the status of the hard drives. When a drive fails, the corresponding LED will turn red.