This article covers Western Digital (WD) Caviar Blue 320GB (320gb) SATA II 7200 RPM 8 MB キャッシュバルク.

Overview

Today we are taking a look at the Western Digital WD Caviar Blue WD3200AAJS, a 320GB internal hard drive designed for desktop PCs and basic storage tasks. This 3.5-inch drive spins at 7200 RPM and features an 8MB cache buffer, connecting via a SATA II (3.0 Gbps) interface. While its capacity is modest by modern standards, it remains a viable choice for secondary storage in budget-oriented builds, legacy system upgrades, or as a cost-effective drive for NAS and DVR setups.
Western Digital's Blue series has long been known for striking a balance between reliability and affordability. The WD3200AAJS carries that tradition, offering a straightforward storage solution without unnecessary frills. In an era where SSDs dominate primary storage, this old-school HDD still finds a place for bulk data that doesn't require fast random access.

Compatibility Guide

The WD3200AAJS uses the standard 3.5-inch form factor and a SATA II interface (3.0 Gbps). It will fit into any desktop case with a 3.5-inch drive bay, and it requires a standard SATA data cable and a SATA power connector from the PSU. You can also install it in an external enclosure to use as a portable backup drive. Note that it is not compatible with 2.5-inch bays found in most laptops or small-form-factor PCs. When connected to a SATA III port, the drive will operate at SATA II speeds (3 Gbps max), which is fine for this HDD's capabilities.

Product Info

The WD3200AAJS has been on the market since around 2010 and is still available through retailers like often as new-old-stock or refurbished units. Pricing currently sits around ¥17,100, which is relatively high for a 320GB HDD. Warranty terms vary by seller, typically one year. The drive is positioned firmly in the entry-level segment — it is not intended for high-performance computing or OS booting, but rather for secondary storage or use in older systems.

Best Use Cases

  • Budget secondary storage: If you already have a fast SSD for your OS and apps, this HDD can serve as an inexpensive repository for documents, photos, and media files. Its 7200 RPM speed provides decent sequential reads for large files, though random access is slow.
  • Legacy system upgrade: For an old desktop PC that still uses SATA II and has a 3.5-inch drive bay, the WD3200AAJS is a drop-in replacement. It's a practical way to extend the life of a secondary storage machine without investing in modern hardware.
  • NAS or DVR storage: For systems that prioritize capacity over speed and where continuous writes are common, an HDD like this one is more durable and cost-effective than an SSD. The 320GB size suits small home servers or security DVRs with limited storage needs.

Things to Consider

First and foremost, 320GB is a very small capacity by today's standards. It is not suitable as a primary drive for any modern operating system and applications — you'll run out of space quickly. Additionally, the SATA II interface caps performance at around 300 MB/s sequential, which is far below even budget SSDs. At its current price of roughly ¥17,100, you could purchase a 1TB SATA SSD with much better performance and longevity. Also be aware that many units sold are OEM or bulk packages with limited warranty support from the seller rather than Western Digital directly. Check the warranty terms before purchase.

FAQ

Q: Can I use this HDD with a Mac?
A: Yes, if your Mac has a 3.5-inch SATA bay and you reformat the drive to a compatible file system (e.g., APFS or HFS+). It works with older Mac Pro towers and some iMac models.
Q: Will it work on a SATA III motherboard?
A: Yes, but it will be limited to SATA II speeds (3.0 Gbps). The drive itself cannot exceed that interface bandwidth, so performance will be the same whether you plug it into SATA II or SATA III.
Q: Is this drive good for gaming?
A: No. Its slow random access and low sequential speeds make it unsuitable for modern games, which require high throughput and fast loading. A SATA SSD or NVMe drive is recommended for gaming.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: BC IMPORT STORE
  • Fulfilled by: BC IMPORT STORE
  • ASIN: B00VAT701W
  • Note: This article covers a manufacturer-made product based on Amazon listing details.