Seagate ST500LM021 – Overview & Key Specs
Capacity: 500 GB
Form Factor: 2.5‑inch, 7 mm thin—ideal for compact and ultrabook designs 
Interface: SATA III (6 Gb/s); backwards compatible with SATA I & II 
Rotational Speed: 7,200 RPM—faster data access than typical 5,400 RPM laptop HDDs 
Cache: 32 MB for smoother performance 
Performance & Endurance
Sustained Transfer Rate: Up to approximately 135 MB/s 
Average Seek Time: ~11 ms, with average latency ~4.2 ms 
Power Consumption: Around 1.5 W (avg operating); SHI lists ~1.8 W active, ~0.65 W idle 
Reliability Measures:
Load/Unload Cycles: ~600,000
Non‑recoverable Read Errors: ~1 per 10¹⁴ bits read
Shock Resistance: 400 Gs operating; 1,000 Gs non‑operating
Workload Rating: Under 55 TB/year—suitable for regular consumer laptop use 
MTTF / Life Expectancy: Not specified directly, but part of the “High Performance Drives” category 
Physical Dimensions & Build
Dimensions:
Length: ~100.55 mm
Width: ~70.1 mm
Height: ~7 mm (thin form)
Weight: ~95 g 
Smart Features:
Advanced Format with 512e (logical 512 B / physical 4096 B) support for future-proofing 
Technologies like QuietStep, Ramp Load, and SmartAlign enhance reliability and performance 
Warranty & Reliability
Limited Manufacturer Warranty: 2 years, as confirmed by Seagate’s official data