This article covers WD Purple 4TB 監視ハードディスクドライブ Intellipower 3.5インチ SATA 6Gb.

Overview

The Western Digital WD Purple 4TB is a 3.5-inch internal hard drive purpose-built for surveillance systems. It offers 4TB of storage, spins at 5400 RPM, packs a 64MB cache, and connects via SATA 6Gb/s. Rated for a workload of up to 180TB per year, this single drive can support as many as 64 security cameras simultaneously. Unlike standard desktop HDDs, the WD Purple is engineered for 24/7 continuous operation in demanding environments. Its firmware is tuned for streaming writes, ensuring smooth video capture even under heavy load. IntelliPower technology balances power consumption and noise while maintaining reliable performance, making it a solid choice for both home and business security setups. In the market, the WD Purple 4TB sits in the entry-to-mid-range surveillance HDD segment. It costs a bit more than a general-purpose drive of the same capacity, but the added reliability and warranty coverage justify the premium for users who need always-on recording.

Compatibility Guide

The WD Purple 4TB uses the standard 3.5-inch form factor, so it fits in most PC cases, NAS enclosures, and NVRs. The SATA 6Gb/s interface is backward-compatible with SATA 3Gb/s ports. Power is supplied via a standard SATA 15-pin connector. However, this drive is not recommended as a boot drive for a desktop PC. Its firmware is optimized for sequential writes, not random I/O, so using it for an operating system will result in sluggish performance. If you plan to use it in a RAID array, verify compatibility with your controller first, as the WD Purple's error recovery behavior differs from that of RAID-optimized drives.

Product Info

The WD Purple 4TB (model WD40PURZ) is part of Western Digital's Purple series, launched around 2019 and still widely available. It comes with a standard 3-year warranty (varies by region). Pricing typically falls between ¥7,000 and ¥8,000, and it can be purchased from major retailers like or electronics stores. Market positioning is mid-range surveillance. Compared to WD Blue or WD Red, the Purple line is specifically tuned for 24/7 streaming workloads. It has become an industry standard for NVR compatibility, with many recorder manufacturers listing it as a tested drive.

Best Use Cases

Home security system builders: If you're setting up multiple IP cameras with an NVR or PC-based recorder, the WD Purple 4TB handles continuous recording reliably. It supports up to 64 cameras, giving you room to expand. Small office or retail surveillance: For environments that require 24/7 recording, this drive's high-temperature tolerance and steady write performance make it a trustworthy choice. It can handle the heat of a cramped server closet without issue. Upgrading an existing DVR/NVR: Swapping out an old or failing drive is straightforward. The WD Purple is a drop-in replacement for most consumer and prosumer recorders. Who should NOT buy this drive: Gamers or creative professionals needing fast storage (the 5400 RPM speed and low random I/O are unsuitable). * Anyone wanting a boot drive for a desktop PC (use a WD Blue or an SSD instead).

Things to Consider

The WD Purple 4TB is not a general-purpose drive. Its random read/write performance is significantly lower than that of WD Blue or WD Black, so using it as an OS drive will lead to noticeable lag. Sequential transfer speeds hover around 200 MB/s, which is fine for video streams but slow compared to 7200 RPM HDDs or SSDs. Competitors include Seagate SkyHawk and Toshiba MD series. The WD Purple's AllFrame technology reduces frame loss, which can be a deciding factor for critical recordings. However, pricing is similar to SkyHawk, so check current deals. Be aware that some WD Purple 4TB units may use SMR (shingled magnetic recording) instead of CMR. SMR drives can suffer from reduced write performance after sustained use, especially if you frequently overwrite footage. Verify the recording technology for your specific model before purchase. ## FAQ
Q: Can I use the WD Purple 4TB as a data drive in my desktop PC? A: Technically yes, but it's not recommended. The drive is optimized for sequential writes, not the random I/O typical of desktop use. For file storage or OS duty, a WD Blue or WD Red is a better fit. Q: Is this drive compatible with my NAS? A: It can physically fit, but WD Purple is not designed for NAS workloads. For RAID or multi-user environments, use WD Red drives instead. The Purple's error recovery may cause timeouts in RAID arrays. Q: How many cameras can I connect to one drive? A: Western Digital rates it for up to 64 cameras per drive. Real-world capacity depends on resolution, frame rate, and compression. Always plan with headroom to avoid dropped frames.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: 2ndK2
  • Fulfilled by: 2ndK2
  • ASIN: B07X8XMQJQ
  • Note: This article covers a manufacturer-made product based on Amazon listing details.