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Western Digital WD400AB  IDE Hard Drive Part # 810980


Physical Specifications
Formatted Capacity* 40,021 MB
Interface 40-pin EIDE
Actuator Type Rotary Voice Coil
Number of Platters 2
Data Surfaces 3
Number of Heads 3
Bytes Per Sector 512
User Sectors Per Drive 78,165,360
Servo Type Embedded
Recording Method Rate 16/17 PRML
ECC Reed Solomon
Head Park** Automatic
Performance Specifications
Average Seek (Read) 9.5 ms average, 18 ms maximum
Average Seek (Write) 12 ms average, 20 ms maximum
Track to Track Seek 2.0 ms average, 5 ms maximum
Full Stroke Seek 21 ms average, 28 ms maximum
Index Pulse Period 10.0 ms (nominal)
Average Latency 5.0 ms (nominal)
Rotational Speed 5400 RPM (nominal)
Transfer Rate (Buffer to Host) 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)
Transfer Rate (Buffer to Disk) 231 Mbits/s minimum
424 Mbits/s maximum
Interleave 1:1
Buffer Size 2 MB
Error Rate (Non-Recoverable) <1 in 1014 bits read
Spindle Start Time
- From Power-on to Drive Ready*
5.5s average, 9 s maximum
Spindle Start Time
- From Power-on to Rotational Speed**
4.5s average, 7 s maximum
Contact Start/Stop Cycles (CSS) 40,000 minimum

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