Copyright © 2005 Seagate Technology LLC.All rights reserved. Printed in USA. Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate 
Technology LLC. LD25 Series is a trademark or registered trademark of Seagate Technology LLC. Other product names are trademarks or registered trademarks of their 
owners. One gigabyte, or Gbyte, equals one billion bytes when referring to hard drive capacity.Accessible capacity may vary depending on operating environment and 
formatting. Seagate reserves the right to change, without notice, product offerings or specifications. Publication Number: DS-1583-001,July 2005
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Uniquely designed for stationary 
appliances or low-profile computing 
platforms
• Provides 2.5-inch storage options without the cost 
burden of drives designed for notebook PCs or other 
mobile applications
• Low-profile form factor delivers up to 40 Gbytes of 
storage while enabling innovative industrial designs 
suited for stylish consumer electronic systems.
• Quiet operation and low power consumption help 
enable reliable, distraction-free delivery of multimedia 
content.
Seagate Design Service Centers 
• Expertise in helping consumer electronics (CE) 
companies and manufacturers overcome technical 
issues
• Speeds your time to market by solving CE design 
issues quickly and efficiently
• Improves your product’s reliability and performance
• Field engineering and business support teams are 
available in person, worldwide
• Advanced application design advice available through 
our design centers in USA and Singapore
World-Class Technical Support
• Certified, experienced support staff
• Rated “Above Average to Excellent”
• Support lines with shortest wait times
• Individually archived case histories
• Web-based Q&A forum and autoreply e-mail
www.seagate.com 
1-800-732-4283 (1-800-SEAGATE)
LD25 Series 
Small, economical and silent storage options for stationary consumer systems.
Model Number
Interface Options
Performance
Spindle Speed (RPM) 
Average Latency (msec) 
Seek Time
Average Read/Write (msec)
Transfer Rate
Maximum Internal (Mbytes/sec) 
Maximum Sustained (Mbytes/sec)
Cache, Multisegmented (Mbytes)
Configuration/Organization
Bytes per Sector
Reliability/Data integrity
Nonrecoverable Read Errors per Bits Read
Power Management
Startup current (5V, typical Amps) 
Seek (typical, watts) 
Idle Average (watts) 
Standby Average (watts)
Environmental
Temperature, Operating (°C) 
Temperature, Nonoperating (°C) 
Shock, Operating: 2 msec (Gs) 
Shock, Nonoperating: 1 msec (Gs) 
Acoustics Idle (bels—sound power) 
Rotational Vibration (Rad/sec, Gs)
Physical
Height (mm) 
Width (mm) 
Depth (mm) 
Weight (g)
40 GB
1
Specifications
ST9402115AS 
ST9402115A
SATA/150 
Ultra ATA/100
5400
5.6
<16
57.6 
150/100 
2
512
1 sector per 10
14
1
2.9
2.5 
<1.5
5 to 55 
–40 to 70 
100 
500
2.4 
.5
9.5
69.85
100.51 
100
20 GB
1
ST920217AS 
ST920217A
SATA/150 
Ultra ATA/100
5400
5.6
<16
57.6 
150/100 
2
512
1 sector per 10
14
1
2.9
2.5 
<1.5
5 to 55 
–40 to 70 
100 
500
2.4 
.5
5.0 +/–0.1
69.85
100.51 
100
1
One gigabyte, or GB, equals one billion bytes when referring to hard drive capacity.