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20 Chapter 1
Hard Disk Drive Interface
Item Specification
Vendor & Model Name Seagate
ST9250315AS
ST9320325AS
ST9500325AS
Toshiba
MK2555GSX
MK3263GSX
MK5055GSX
HGST
HTS545025B9
HTS545032B9
HTS545050B9
WD
WD2500BEVT
WD3200BEVT
WD5000BEVT
WD6400BEVT
Capacity (GB) 250, 320, 500 250, 320, 500 250, 320, 500 250, 320, 500,
640
Bytes per sector 512 512 512
Data heads 2, 3, 4 2, 3, 4 2, 3, 4
Drive Format
Disks 1, 2, 2 1, 2, 2 1, 2, 2 TBD
Spindle speed (RPM) 5400
Performance Specifications
Buffer size 8 MB
Interface SATA
Internal transfer rate
(Mbits/sec, max)
1175 875
I/O data transfer rate
(Mbytes/sec max)
300 3000 300 3000
DC Power Requirements
Voltage tolerance 5V ±5% 5V ±5% 5V ±5% 5V ±5%