This article covers Seagate Expansion ポータブル 2.5インチ 【データ復旧 3年付】4TB 外付 ハードディスク HDD 3年保証 静音 PC Win Mac PS4 PS5 4K 対応 STKM4000400.

Overview

Seagate's Expansion Portable series has long been a go-to choice for external storage, and the STKM4000400 model continues that tradition with a 4TB capacity packed into a 2.5-inch form factor. Powered entirely via USB bus power, this drive needs no external adapter, making it a true portable companion. It's officially compatible with PS5 and PS4, so console gamers can easily expand their game library storage. The standout feature is the included 3-year Rescue data recovery service, giving users peace of mind that their data can be retrieved even if the drive fails mechanically.

Compatibility Guide

The drive connects via USB 3.0 and is recognized natively on both Windows and macOS without additional drivers. On PS5, after formatting, it works as external storage for PS4 titles and media, though PS5 native games cannot be played directly from it. TV recording is supported on many compatible models, but always check Seagate's official compatibility list beforehand. The USB bus-powered design means you don't need to carry an AC adapter, which is ideal for mobile setups with laptops or consoles.

Product Info

Released in 2021 and still widely available, the STKM4000400 typically retails around ¥28,000–¥30,000 depending on the retailer. It comes with a 3-year manufacturer warranty plus the Rescue data recovery service included at no extra cost. Market positioning is squarely in the entry-to-mid range: this is a reliable, high-capacity portable HDD for users who prioritize capacity and data safety over raw speed. The black matte finish resists fingerprints, and the drive weighs just 257 grams, making it easy to slip into a bag.

Best Use Cases

Backup & Archival: Perfect for backing up photos, videos, and documents. The included Rescue service offers an extra layer of protection for irreplaceable data. Console Storage Expansion: Plug-and-play on PS4 and PS5 (for PS4 games). No formatting hassle – just connect, format once, and start moving games. * Mobile Data Carrying: With its compact size (115.3 x 80 x 20.9 mm) and bus-powered operation, this drive is ideal for laptop users who need extra storage on the go without extra cables or power bricks. ## Alternatives
At this price point, the main competitor is Western Digital's My Passport 4TB portable HDD. Both offer similar capacity, interface, and physical size. The key difference: Seagate includes Rescue data recovery for the full 3-year warranty period, while WD's equivalent service typically requires separate purchase after the first year. WD's My Passport does come with automatic backup software, but Seagate's Rescue service provides tangible peace of mind. For gamers, Seagate's explicit PS5 compatibility is a clear advantage. If budget is tight, the slightly cheaper Toshiba Canvio Basics 4TB is another option, but lacks data recovery and console certification.

Things to Consider

Speed: USB 3.0 sequential reads/writes top out around 140 MB/s. If you frequently transfer large files, an external SSD (e.g., Samsung T7) would be noticeably faster, albeit at a higher price per GB. Durability: 2.5-inch HDDs are sensitive to physical shock. Always handle with care and use a padded case when traveling. This drive is not drop-resistant like some ruggedized models. TV Recording Caveats: Rescue service does not cover TV recording data. Also, not all TV models are compatible; check Seagate's list before buying for this purpose. SSD Price Drop: With 4TB SATA SSDs now available under ¥50,000, the value gap is narrowing. If speed and silence matter, consider whether a SATA SSD in an external enclosure might be a better long-term investment. * USB Standard: This drive uses USB Micro-B, not USB-C. If you prefer a USB-C connection, look at Seagate's One Touch series which offers USB-C out of the box.

Product Disclosure (Amazon)

  • Manufacturer: シーゲイト(SEAGATE)
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B08ZJFH7Y1
  • Note: This article covers a manufacturer-made product based on Amazon listing details.