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Western Digital 20GB VL20X Hard Disk Drive

The drive supports Mode 5 Ultra ATA/100, Mode 4 Ultra ATA/66, Mode 2 Ultra ATA/33, Mode 4 PIO, and Mode 2 multiword DMA data transfers.
This drive incorporates leading-edge giant magnetoresistive head technology to meet increasing capacity needs. Read and write
elements in the GMR head are separate in order to optimize read and write capabilities. The read element, composed of a thin-film
material whose resistance changes in the presence of a magnetic field, produces a strong signal, allowing significant increases in areal densities.

Manufacture: Western Digital
100 MB/sec

Physical Specifications

Manufacturer Western Digital
Manufacturer model WD200EB
Formatted capacity 20,020 MB
Interface 40-pin EIDE
Actuator type Rotary Voice Coil
Number of Disks 1
Data Surfaces 2
Number of Heads 2
Bytes per sector 512
User sector per drive 39,102,336
Servo Type Embedded
Recording Method EPR4 Rate 16/17 PRML
ECC Reed Solomon
Head Park Automatic
Average Seek (read) 12.4 ms average, 19 ms maximum
Average Seek (write) 14 ms average, 20 ms maximum
Track to Track Seek 2.0 ms average, 5 ms maximum
Full Stroke Seek 28.5 ms average, 32 ms maximum
Index Pulse Period 8.3 ms (nominal)
Average Latency 5.35 ms (nominal)
Rotational Speed 5400 RPM (nominal)
Data 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) 420 Mbits/s maximum
400 Mbits/s maximum
Interleave 1:1
Buffer Size 2 MB
Spindle Start Time
From Power-on to Drive Ready
6.0s average, 10.0s maximum
Spindle Start Time
From Power-on to Rotational Speed
4.5s average, 7.0s maximum
Spindle Stop Time 4s average
Contact Start/Stop Cycles (CSS)

40,000 minimum