# Western Digital 640 GB 3.5-Inch, 32 MB Cache, 7200 RPM SATA II Bulk/OEM Hard Drive

- Category: Storage
- Brand: Western Digital
- Model: WD6401AALS
- Part number: WD6401AALS
- Price (US): currently unavailable
- Price last checked: 2026-08-05
- Rating: 1.0/5 from 1 Amazon reviews
- Warranty: 1 year
- Product page: https://buildmypc.net/component-details/storage/western-digital-wd6401aals/

## Specifications

| Spec | Value |
| --- | --- |
| Brand | Western Digital |
| Model | WD6401AALS |
| Maximum Capacity | 640 GB |
| Form Factor | 2.5" (HDD) |
| Cache Memory | 32 MB |
| Interface | SATA 3 Gb/s |

## Key Features

- Killer speed - Built on the performance bloodlines of WD Raptor, these 10,000 RPM drives, with SATA 6 Gb/s interface, and 32 MB cache deliver mind-bending performance. Not only are they 15% faster than the previous generation WD Raptor drives, but they also beat out all other competitors in the field.
- Rock-solid reliability - Designed and manufactured to mission-critical enterprise-class Standards to provide enterprise reliability in high Duty cycle environments. With 1.4 million hours MTBF, these drives have the highest available reliability rating on a high capacity SATA drive.
- Ultra-cool operation - Consumes less idle power and uses similar active power as the previous generation WD VelociRaptor, while offering double the capacity and higher performance.
- Rotary Acceleration Feed Forward (RAFF) - Optimizes operation and performance when the drives are used in vibration-prone, multi-drive chassis.
- NoTouch ramp load technology - The Recording Head never touches the Disk media ensuring significantly less wear to the recording head and media as well as better drive protection in transit.

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