Acer eMachines E720 Series - Page 28

18 Chapter 1
Hard Disk Drive Interface
Item Specifications
Vendor &
Model Name
Hitachi
5K320-320
5K320-250
5K320-160
5K320-120
Segate
ST9250827AS
ST9120817AS
WD
WD1200BEVS
WD
WD3200BEVT
WD1600BEVT
Capacity (MB)
320, 250,
160, 120
250, 120 120 320, 160
Bytes per
sector
512 512 512 512
Data heads
4, 4 or 3, 2, 2 4, 2 2 4, 2
Drive Format
Disks
2, 2, 1,1 2, 1 1 2, 1
Spindle speed
(RPM)
5400 5400 5400 5400
Performance Specifications
Buffer size
8 MB 8 MB 8 MB 8 MB
Interface
SATA SATA SATA SATA
Internal
transfer rate
(Mbits/sec,
max)
674 ~ 775 778 850 Mbits/s
maximum
850 Mbits/s
maximum
I/O data
transfer rate
(Mbytes/sec
max)
1.5 / 3.0 300 150 maximum 300 maximum
DC Power Requirements
Voltage
5V ±5% 5V ±5% 5V ±5% 5V ±5%