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Rectangular silver 3.5 inch SATA hard drive with black label

Western Digital

Western Digital Caviar Black WD6401AALS 640GB 7200RPM 32MB 3.5" SATA internal hard drive

SKU CH-TSYD-X8EAM

A 640 GB desktop hard drive spinning at 7200 RPM with a 32 MB cache and SATA 3 Gb/s interface

  • 640 GB capacity stores large media libraries and backups
  • 7200 RPM spindle speed delivers fast sequential read and write performance
  • 32 MB cache buffer smooths burst workloads and reduces latency
  • 3 Gb/s SATA interface provides broad desktop and workstation compatibility
  • 5 inch form factor fits standard drive bays and mounting brackets

640 GB desktop hard drive

This 640 GB 3.5 inch SATA drive spins at 7200 RPM with a 32 MB cache. It suits builders adding bulk storage to a desktop tower or replacing an older mechanical disk. The SATA 3 Gb/s interface fits standard motherboard ports without adapters. Buyers needing solid-state speed or capacities above one terabyte should look elsewhere.

Sustained throughput on mechanical media

Sequential transfers hold steady at the rate allowed by the 7200 RPM platters and 32 MB buffer. Random access follows mechanical seek limits rather than burst caching. The drive maintains consistent output during long copies, backups or video capture sessions. Workloads demanding SSD-class latency or sustained writes above the native media rate will saturate the mechanism.

Thermals noise and power in normal use

The unit weighs 2.0 pounds and fits standard 3.5 inch bays with typical mounting screws. Operational acoustics come from spindle rotation and actuator movement at 7200 RPM. Power draw follows conventional desktop hard drive profiles for this spindle speed. No special cooling beyond normal case airflow is required.

Points forts

  • 640 GB capacity stores large media libraries and backups
  • 7200 RPM spindle speed delivers fast sequential read and write performance
  • 32 MB cache buffer smooths burst workloads and reduces latency
  • 3 Gb/s SATA interface provides broad desktop and workstation compatibility
  • 5 inch form factor fits standard drive bays and mounting brackets

Caractéristiques

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Questions sur cet article

How much power and heat does the 7200RPM WD6401AALS produce when running continuously?

The 7200RPM motor and 32MB cache draw typical desktop-drive power; expect normal warmth for a 3.5" SATA drive under sustained load.

Which cables and motherboard port do I need to install this 3.5" SATA 3Gb/s drive?

You need a standard SATA data cable, a SATA power connector from your PSU, and a free 3.5" drive bay with a SATA 3Gb/s (or faster) port on the motherboard.

Will this 640GB SATA drive work alongside my older IDE drives on the same PC?

Yes — it connects via SATA, so it runs independently of any IDE devices; the motherboard simply needs both a SATA port and an IDE controller or adapter for the older drives.

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