Western Digital Protege WD400EB 40GB 5.4K 3.5″ EIDE Hard Drive

Capacity: 40GB
Spindle Speed: 5,400RPM
Interface Type: IDE / ATA (3.5″)
Disk Size: 3.5″x1.0″ (LFF Hard Drive)
Sustained Throughput (MBps): 
Average Seek Time (read/write ms): 12.8 / 13.8
Electrical Interface Speed: EIDE / Ultra ATA/100 – 100MBps
On-Board Cache: 2MB

Physical Specifications
Capacity	40GB
Interface	40-pin EIDE
Actuator Type	Rotary Voice Coil
Bytes Per SECTOR	512
Servo Type	Embedded

Performance Specifications
Average Seek 1 – Read – Write	12.8 ms average 13.8 ms average
Track-to-Track Seek	2.0 ms average
Full Stroke Seek	28.5 ms average
INDEX Pulse Period	8.3 ms (nominal)
Average Latency	4.2 ms (nominal)
Rotational Speed	5400 RPM (nominal)
Buffer Size	2 MB
Data Transfer Rate (maximum) – Buffer to Host – Buffer to Disk	100 MB/s (Mode 5 Ultra ATA) 66.6 MB/s (Mode 4 Ultra ATA) 33.3 MB/s (Mode 2 Ultra ATA) 16.6 MB/s (Mode 4 PIO) 16.6 MB/s (Mode 2 multi-word DMA) 695 Mbits/s maximum