Western Digital WD2500SB RE edition EIDE / ATA / PATA Hard Drive

Capacity: 250GB
Spindle Speed: 7,200RPM
Interface Type: IDE / ATA (3.5″)
Disk Size: 3.5″x1.0″ (LFF Hard Drive)
Sustained Throughput (MBps): 
Average Seek Time (read/write ms): 8.9 / 10.9
Electrical Interface Speed: EIDE / Ultra ATA/100 – 100MBps
On-Board Cache: 8MB

Physical Specifications
Formatted Capacity 1	251,000 MB
Interface	40-pin EIDE
Actuator Type	Rotary Voice Coil
Number of Disks	3
Data Surfaces	6
Number of Heads	6
Bytes Per SECTOR	512
User SECTORS Per Drive	490,234,752
Servo Type	Embedded

Performance Specifications
Average Seek 1 – Read – Write	8.9 ms average 10.9 ms average
Track-to-Track Seek	2.0 ms average
Full Stroke Seek	21 ms average
INDEX Pulse Period	8.3 ms (nominal)
Average Latency	4.2 ms (nominal)
Rotational Speed	7200 RPM (nominal)
Buffer Size	8 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) 748 Mbits/s maximum