Western Digital WD400AB IDE Hard Drive
BABER.com 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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