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WD Caviar Blue
Desktop Hard Drives
Drive Specifications
SATA Hard Drives
40 GB
1
Formatted capacity
40,020 MB
User sectors per drive
78,165,360
WD model number
WD400JD
EIDE Hard Drives
80 GB
1
Formatted capacity
80,026 MB
User sectors per drive
156,301,488
WD model number
WD800JB
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
8 MB
Cache
Read
Adaptive
Write
Yes
Data transfer rate
Buffer to disk
972 Mbits/s (maximum)
Buffer to host
3 Gb/s (maximum)
Drive ready time
12.5 sec (maximum)
Error rate (non-recoverable)
<1 in 10
LBA support
Yes
Rotational speed
7200 RPM
3
Start/stop cycles
50,000 minimum
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
Controlled unload at ambient condition.
4
Maximum burst rate running the specified PIO, DMA, or Ultra ATA transfer mode.
80 GB
120 GB
160 GB
80,026 MB
120,034 MB
160,041 MB
156,301,488
234,441,648
312,581,808
WD800JD
WD1200AAJS WD1600AAJS WD2500AAJS WD3200AAJS WD4000AAJS WD5000AAJS
160 GB
250 GB
320 GB
160,041 MB
250,059 MB
320,072 MB
312,581,808
488,397,168
625,142,448
WD1600AAJB WD2500AAJB WD3200AAJB WD4000AAJB WD5000AAJB
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
Mode 4 Ultra ATA
Mode 2 Ultra ATA
Mode 2 Ultra DMA
15
bits read
Mode 4 Ultra PIO
Drive ready time
Error rate (non-recoverable)
LBA support
Rotational speed
Start/stop cycles
250 GB
320 GB
400 GB
250,059 MB
320,072 MB
400,088
488,397,168
625,142,448
781,422,768
400 GB
500 GB
400,088
500,107
781,422,768
976,773,168
Rotary voice coil
512
3.5-inch
2
Yes
5.5 ms
8 MB
Adaptive
Yes
4
100 MB/s
4
66.6 MB/s
4
33.3 MB/s
4
16.6 MB/s
4
16.6 MB/s
7.0 sec (average)
15
<1 in 10
bits read
Yes
7200 RPM
4
50,000 minimum
-3-
500 GB
500,107
976,773,168
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