Seagate
Seagate Cheetah NS ST3400755SSProduct 400 GB 3.5" SAS internal hard drive
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$23.99
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Western Digital
Western Digital WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" internal hard drive
A 640 GB 3.5-inch desktop drive spinning at 7200 RPM with 32 MB cache and a SATA 3.0 Gb/s interface
- PackagingBare Drive
- Capacity640GB
- RPM7200 RPM
- InterfaceSATA 3.0Gb/s
- Cache32MB
- Form Factor3.5"
- 7200 RPM spindle speed accelerates data access
- 32 MB cache buffer smooths burst transfers
- SATA 3.0 Gb/s interface enables fast throughput
- DoD 5220.22-M compliant erase sanitises the drive
- 640 GB capacity stores ample desktop data
Capacity and interface
This Western Digital Caviar Black drive provides 640 GB of storage on a 3.5 inch form factor with a SATA 3.0 Gb/s interface. It spins at 7200 RPM and includes a 32 MB cache for desktop workloads. The unit is sold as a bare drive without cables or mounting hardware.
SATA 3.0 Gb/s practical limits
The SATA 3.0 Gb/s link caps theoretical throughput at 3.0 Gb/s, so sustained transfer rates will not exceed this ceiling. Native Command Queuing is supported to optimise command ordering on busy workloads. The drive is erased to DoD 5220.22 M standard and tested good, though up to 25 bad sectors may be present.
Pre-installation checks
Verify that your system has a free 3.5 inch drive bay and a spare SATA data and power connector. Confirm the BIOS or UEFI recognises SATA 3.0 Gb/s devices and that no drive-size limitation blocks a 640 GB volume. The drive ships unformatted and unpartitioned, so you must initialise it in the operating system before use.
Highlights
- 7200 RPM spindle speed accelerates data access
- 32 MB cache buffer smooths burst transfers
- SATA 3.0 Gb/s interface enables fast throughput
- DoD 5220.22-M compliant erase sanitises the drive
- 640 GB capacity stores ample desktop data
Specifications
| Brand | Western Digital |
|---|---|
| Series | Black |
| Model | WD6401AALS |
| Packaging | Bare Drive |
| Capacity | 640GB |
| RPM | 7200 RPM |
| Interface | SATA 3.0Gb/s |
| Cache | 32MB |
| Form Factor | 3.5" |
| Features | Erased (DoD 5220.22 M Compliant) and tested good (Not formatted, partitioned, or allocated). Sold as used and in working condition. There may be drives that have up to 25 bad sectors. There may be writing or markings on the drive or the drive may vary slightly (color and/or label may differ) from picture but the model numbers will be the same. |
| Shipping weight | 0.73 kg |
| Package size | 152 × 102 × 25 mm |
Questions about this item
Should I choose the 640GB model or a different capacity?
This listing is for the 640GB version only. If you need more space, you would need to buy additional drives; if you need less, this drive still provides 640GB of storage.
What does the 7200 RPM speed mean for daily use?
The 7200 RPM spindle speed means the platters spin faster than slower drives, reducing the time the head waits for data to arrive and improving overall responsiveness when opening files or loading programs.
What does the SATA 3.0Gb/s interface limit in practice?
The SATA 3.0Gb/s link caps the maximum theoretical transfer rate at 3.0 Gb/s, so sustained read or write speeds cannot exceed that ceiling even if the drive's internal mechanics could go faster.
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