This article covers Western Digital HDD 4TB WD Purple 監視システム 3.5インチ 内蔵HDD WD40PURZ.

Overview

The Western Digital WD Purple WD40PURZ is a 4TB 3.5-inch internal hard drive designed specifically for 24/7 surveillance systems. It features a SATA 6Gb/s interface, 5400RPM spindle speed, and 64MB cache. Built with AllFrame technology to reduce frame loss in high-resolution video recording, this drive offers enhanced reliability compared to standard desktop HDDs. Positioned as a mid-range surveillance storage solution, it suits home security setups and small business monitoring environments.

Compatibility Guide

This drive uses the standard 3.5-inch form factor and SATA 6Gb/s interface, making it compatible with most desktop PCs that have an available 3.5-inch drive bay and a SATA power connector. It also works with many DVR/NVR surveillance recorders. However, it cannot be installed in laptops or small form-factor cases that only support 2.5-inch drives. Ensure your system has a free SATA port on the motherboard and adequate power supply (power draw is minimal, typically under 5W).

Product Info

The WD40PURZ is part of Western Digital's Purple series, launched around 2017 and still widely available. Pricing typically ranges from ¥25,000 to ¥35,000 depending on the retailer. It comes with a 3-year manufacturer warranty and a 1-year distributor warranty in Japan. Market positioning is mid-range surveillance storage, offering higher endurance than the Blue series but lower performance than the Black or Gold series. Key specs: 4TB capacity, 5400RPM, 64MB cache, SATA 6Gb/s.

Best Use Cases

  • Home or small office surveillance: Ideal for users setting up IP camera systems that require continuous recording. The AllFrame technology minimizes video frame loss, ensuring smooth playback. Not suitable for high-performance computing or gaming.
  • Budget-conscious bulk storage: If you need a large-capacity drive for media archives or backups and don't require high speed, this drive can serve, but a WD Blue or Seagate Barracuda may offer better value for non-surveillance use.
  • DVR/NVR replacement: For upgrading an existing surveillance recorder with a larger or more reliable drive, the WD Purple is the recommended choice.

Things to Consider

This drive is optimized for sequential write workloads typical of video recording, not for random I/O like an OS drive. Its 5400RPM speed results in transfer rates around 150MB/s, far slower than any SSD. Avoid using it in RAID arrays intended for NAS; the error recovery behavior may cause drive dropouts. Also, physical handling is critical – 3.5-inch HDDs are sensitive to shock. If you need a drive for a NAS, consider the WD Red series instead.

FAQ

Q: Can I use this HDD as a boot drive in my desktop?
A: Technically yes, but it's not recommended. The 5400RPM speed will result in slow boot times and sluggish application loading. An SSD is far better for an OS drive.
Q: Is this drive compatible with my Synology/QNAP NAS?
A: It may work, but it's not officially supported for NAS use. WD Purple drives lack TLER (Time-Limited Error Recovery) tuning, which can cause issues in RAID arrays. Use WD Red or WD Red Plus for NAS.
Q: What is the warranty period?
A: Western Digital provides a 3-year limited warranty. In Japan, the distributor (Target Japan) offers an additional 1-year warranty, totaling up to 4 years coverage. Keep your purchase receipt.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: ターゲットジャパン
  • Fulfilled by: ターゲットジャパン
  • ASIN: B071KVB4F8
  • Note: This article covers a manufacturer-made product based on Amazon listing details.