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Chapter 1 21
Hard Disk Drive Interface
Item Specifications
Vendor &
Model Name
Seagate
ST9250827AS
Seagate
ST9320320AS
ST9160310AS
Seagate
ST9500325AS
Toshi ba
MK3252GSX
MK2552GSX
MK1652GSX
WD
WD5000BEVT
WD3200BEVT
WD2500BEVT
WD1600BEVT
Capacity
(MB)
250 320, 160 500 320, 250, 160 500, 320, 250,
160
Bytes per
sector
512 512 512 512 512
Data heads
4 4, 2 4 4, 4, 2 4, 3, 2, 2
Drive Format
Disks
2 2 or 1, 1 2 2, 2, 1 2, 2, 1, 1
Spindle speed
(RPM)
5400 5400 5400 5400 5400
Performance Specifications
Buffer size
8 MB 8 MB 8 MB 8 MB 8 MB
Interface
SATA SATA SATA SATA SATA
Internal
transfer rate
(Mbits/sec,
max)
778 352 1,175 400 ~ 794
typical
106 Mbits/s
maximum
I/O data
transfer rate
(Mbytes/sec
max)
300 150 300 300 300 maximum
DC Power Requirements
Voltage
5V ±5% 5V ±5% 5V ±5% 5V ±5% 5V ±5%