This article covers TOSHIBA 東芝 3.5" 内蔵HDD 4TB(CMR) 7.

Overview

The TOSHIBA MN04ACA400 is a 3.5-inch internal hard disk drive designed for NAS and 24/7 operation environments. It offers 4TB of storage capacity using CMR (Conventional Magnetic Recording) technology, spins at 7200 RPM, and connects via a SATA 6Gbps interface. This model is part of Toshiba's MN series, specifically engineered for multi-drive setups where vibration resistance and sustained performance are critical. Equipped with an RV (Rotational Vibration) sensor, the MN04ACA400 maintains stable read/write performance even when installed alongside multiple drives in a NAS enclosure or server chassis. It supports continuous 24/7 operation and boasts an MTTF (Mean Time To Failure) of 1,000,000 hours, making it a reliable choice for long-term data storage. Positioned as an entry-to-mid-range NAS HDD, this drive comes with a 3-year warranty and local support in Japan. Its CMR recording method ensures consistent random write performance, which is a key advantage over SMR-based drives for workloads involving frequent small-file writes.

Compatibility Guide

This drive uses the standard 3.5-inch form factor and SATA 6Gbps interface. It is compatible with most desktop PC cases, NAS enclosures, and external drive docks that support 3.5-inch drives. The SATA interface is backward compatible with SATA 3Gbps and SATA 1.5Gbps ports. Typical pairing examples include QNAP or Synology NAS systems, as well as custom-built desktop PCs used for file storage or media servers. However, it cannot be installed in 2.5-inch bays found in most laptops or slim PC cases. Power consumption is modest at 5.2W (Typ.) during active idle, and it uses a standard SATA power connector. No special power supply requirements are needed beyond a standard desktop PSU.

Product Info

The TOSHIBA MN04ACA400 was released around 2019 and remains a popular choice for budget-conscious NAS builders. Its current retail price on Japan is approximately ¥26,440, which is competitive for a 4TB CMR HDD in this class. Key specifications include a 128MiB buffer, sustained data transfer rate of 185–195 MiB/s (Typ.), and a maximum weight of 720g. The drive is backed by a 3-year warranty and local support in Japan. In the market, it sits at the entry-to-mid tier, offering a good balance of capacity, reliability, and price for home and small office NAS users.

Best Use Cases

NAS Enthusiasts: The RV sensor makes this drive ideal for multi-bay NAS systems where vibration from adjacent drives can degrade performance. It works well in RAID 1, 5, or 6 configurations for data redundancy. Home Server Operators: For users running a home file server, media server (Plex, Jellyfin), or backup server, the 24/7 rated operation and CMR technology provide dependable long-term storage. * Budget-Conscious Builders: If you need a reliable 4TB drive for a secondary storage pool or archive, this HDD offers good value without the premium price of enterprise-grade models.

Things to Consider

While the MN04ACA400 is a solid choice for NAS use, it is not the fastest HDD on the market. Its sequential write speeds are adequate for most home NAS tasks but may feel slow for large file transfers compared to higher-end models or SSDs. Competitors like the Seagate IronWolf and Western Digital Red series offer similar features and pricing. It is worth comparing warranty terms and noise levels before purchasing. Also, note that this is a 3.5-inch drive, so it will not fit in laptops or ultra-compact cases. Always verify your case's drive bay size before buying. Finally, as with any mechanical HDD, handle it with care to avoid damage from drops or shocks during installation. Secure mounting in a vibration-dampened bay is recommended for optimal longevity.

Product Disclosure (Amazon)

  • Manufacturer: 東芝(TOSHIBA)
  • ASIN: B07S66MWP5
  • Note: This article covers a manufacturer-made product based on Amazon listing details.