This article covers Western Digital Caviar Blue 640GB バルク.

Overview

The Western Digital Caviar Blue series has long been a staple for budget-conscious users seeking reliable storage. The WD6400AAKS model offers 640GB of capacity, a 7200 RPM spindle speed, and a 16MB cache, all housed in a standard 3.5-inch form factor with a SATA II (3Gbps) interface. Western Digital incorporates WhisperDrive technology to minimize noise and IntelliSeek to reduce power consumption and vibration, making this drive a quiet and efficient choice for everyday computing. This drive is well-suited as a secondary or archival storage solution where cost per gigabyte is more important than speed. It can hold up to 128,000 photos, 160,000 MP3 files, or about 77 hours of HD video, providing ample space for home users and small businesses.

Compatibility Guide

The WD6400AAKS uses a SATA II (3Gbps) interface, which is backward compatible with SATA III ports. When connected to a SATA III port, the drive will operate at SATA II speeds, but since HDDs rarely saturate even SATA II bandwidth, the performance impact is negligible. The 3.5-inch form factor fits standard desktop drive bays. Power is supplied via a SATA 15-pin connector, and the drive draws only about 8W under load, so any modern power supply will handle it easily.

Product Info

This drive is part of Western Digital's Caviar Blue line, targeting entry-level to mid-range desktop builds. It comes with a 3-year limited manufacturer warranty. The price on Japan is approximately ¥10,571 (as of May 2026), making it an affordable option for its capacity class. View on Key technologies include WhisperDrive for silent operation, SoftSeek for optimized seek algorithms, and IntelliSeek for reduced power and vibration. It ships in a bulk/OEM package with frustration-free packaging.

Best Use Cases

Media archival and backup drives: Ideal for storing large collections of music, photos, and videos where capacity per dollar is critical. The 7200 RPM speed offers decent transfer rates for sequential reads/writes. Replacement for aging HDDs in older PCs: Compatible with SATA II motherboards, it's a straightforward upgrade to add storage space to older desktops or even some external enclosures. * Quiet home office PCs: The low acoustic noise makes it suitable for environments where silence is appreciated, such as a home office or living room PC.

Things to Consider

While the WD6400AAKS offers good value, its SATA II interface and 16MB cache mean it is slower than modern SSDs or even some newer HDDs with larger caches. It should not be used as a primary boot drive if you require fast system responsiveness. The 640GB capacity may feel limited today; consider larger models if you frequently work with high-resolution video or large game libraries. Additionally, being a bulk/OEM unit, it does not include cables or manual, so you will need to supply your own SATA cable. Competitors such as Seagate BarraCuda and Toshiba offer similar specs with varying cache sizes and warranty terms?it's worth comparing before purchase. ## Specifications | Specification | Detail | |---------------|--------| | Model | WD6400AAKS | | Capacity | 640 GB | | Spindle Speed | 7200 RPM | | Cache | 16 MB | | Interface | SATA II (3Gbps) | | Form Factor | 3.5 inch | | Recording Technology | CMR | | Max Power Consumption | ~8 W | | Idle Noise | ~25 dBA | | Warranty | 3 years (limited) |

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: APOLO1969
  • Fulfilled by: APOLO1969
  • ASIN: B0017XUX7O
  • Note: This article covers a manufacturer-made product based on Amazon listing details.