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WD Caviar Blue
Desktop Hard Drives
Drive Specifications
SATA Hard Drives
250 GB
1
Formatted capacity
250,059 MB
User sectors per drive
488,397,168
SATA latching connector
Yes
WD model number
WD2500AAKS WD3200AAKS WD4000AAKS WD5000AAKS WD6400AAKS WD7500AAKS
EIDE Hard Drives
320 GB
1
Formatted capacity
320,072 MB
User sectors per drive
625,142,448
WD model number
WD3200AAKB WD4000AAKB WD5000AAKB
SATA Hard Drives
Actuator latch/auto park
Yes
Bytes per sector (STD)
512
Form factor
3.5-inch
2
RoHS compliant
Yes
Performance Specifications
SATA Hard Drives
Average latency
4.2 ms
Buffer
16 MB
Cache
Read
Adaptive
Write
Yes
Data transfer rate
Buffer to disk
70 MB/s sustained
Buffer to host
3 Gb/s (maximum)
Drive ready time
13 sec
Error rate (non-recoverable) <1 in 10
LBA support
Yes
Rotational speed
7200 RPM
4
Start/stop cycles
50,000
1
One gigabyte (GB) = one billion bytes. One terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on
operating environment.
2
WD products manufactured and sold worldwide after August 1, 2005, meet or exceed Restriction of Hazardous Substances
(RoHS) compliance requirements as mandated by the European Union for electrical and electronic products. The RoHS
Directive 2002/95/EC of the European Parliament, which is effective in the EU beginning July 1, 2006, aims to protect
human health and the environment by restricting the use of certain hazardous substances in new equipment, and consists of
restrictions on lead, mercury, cadmium, and other substances.
3
For 750 GB.
4
Controlled unload at ambient condition.
5
Maximum burst rate running the specified PIO, DMA, or Ultra ATA transfer mode.
320 GB
400 GB
320,072 MB
400,088 MB
625,142,448
781,422,768
Yes
Yes
400 GB
500 GB
400,088 MB
500,107 MB
781,422,768
976,773,168
EIDE Hard Drives
Actuator type
Bytes per sector (STD)
Form factor
RoHS compliant
EIDE Hard Drives
Average latency
Buffer
Cache
Read
Write
Data transfer rate (buffer to host)
Mode 5 Ultra ATA
3
Mode 4 Ultra ATA
3
Mode 2 Ultra ATA
15
Mode 2 Ultra DMA
bits read
Mode 4 Ultra PIO
Drive ready time
Error rate (non-recoverable)
LBA support
Rotational speed
Start/stop cycles
500 GB
640 GB
750 GB
500,107 MB
640,135 MB
750,156 MB
976,773,168
1,250,263,728 1,465,149,168
Yes
Yes
Yes
Rotary voice coil
512
3.5-inch
2
Yes
5.5 ms
16 MB
Adaptive
Yes
5
100 MB/s
5
66.6 MB/s
5
33.3 MB/s
5
16.6 MB/s
5
16.6 MB/s
7.0 sec (average)
<1 in 10
15
bits read
Yes
7200 RPM
4
50,000
-2-
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