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Physical Specifications
40 GB
Model number
WD400JD
Interface
1.5 Gb/s
(Serial ATA 1.0)
Form factor
3.5-inch
Formatted capacity
40,020 MB
1
User sectors per drive
78,165,360
Bytes per sector (STD)
512
Dedicated landing zone
Yes
Actuator latch/auto park Yes
Warranty
2
3-year
Performance Specifications
Data Transfer Rate
-Buffer to host
3
150 MB/s
-Buffer to disk
748 Mbits/s max
Read seek
8.9 ms (average)
Track-to-track seek
4
2.0 ms (average)
Full stroke read seek
4
21 ms (average)
Average latency
4.2 ms
Rotational speed
7200 RPM
Read cache
Adaptive
Write cache
Yes
Buffer
8 MB
Drive ready time
9.0 sec average
Start/stop cycles
50,000 min
LBA support
Yes
Error rate
(non-recoverable)
<1 in 10
14
bits read
1
Western Digital defines a megabyte (MB) as 1,000,000 bytes and a gigabyte (GB) as 1,000,000,000 bytes. Some operating systems use
the binary numbering system which results in a lower reported capacity.
2
Three-year standard warranty on bulk WD Caviar SE Serial ATA hard drives. This standard warranty may be subject to variations
imposed by local law or regulations.
3
Effective maximum transfer rate running Serial ATA 1.0.
4
On reads and writes.
80 GB
120 GB
WD800JD
WD1200JD
1.5 Gb/s
1.5 Gb/s
(Serial ATA 1.0)
(Serial ATA 1.0)
3.5-inch
3.5-inch
80,026 MB
120,034 MB
156,301,488
234,441,648
512
512
Yes
Yes
Yes
Yes
3-year
3-year
160 GB
200 GB
WD1600JD
WD2000JD
1.5 Gb/s
1.5 Gb/s
(Serial ATA 1.0)
(Serial ATA 1.0)
3.5-inch
3.5-inch
160,041 MB
200,049 MB
312,581,808
390,721,968
512
512
Yes
Yes
Yes
Yes
3-year
3-year
250 GB
WD2500JD
1.5 Gb/s
(Serial ATA 1.0)
3.5-inch
250,059 MB
488,397,168
512
Yes
Yes
3-year
For service and literature:
800.
ASK
+31.20.4467651 Europe
support.wdc.com
www.westerndigital.com
Western Digital, the Western Digital logo, and
WD Caviar are registered trademarks, and
Data Lifeguard, Data Lifeguard Tools,
SecureConnect, FlexPower, and
FIT Lab are trademarks of Western Digital
Technologies, Inc. Other marks may be
mentioned herein that belong to other
companies. Product specifications subject to
change without notice.
©2004 Western Digital Technologies, Inc.
All rights reserved.
Western Digital
20511 Lake Forest Drive
Lake Forest, California 92630 U.S.A.
2879-001081-003 02/04
.4
U.S.A.
WDC
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