This article covers Seagate One Touch ポータブルHDD 4TB STKZ4000400.

Overview

The Seagate One Touch Portable HDD 4TB STKZ4000400 is a 2.5-inch external hard drive designed for easy backup and data portability. It offers 4TB of storage capacity over a USB 3.0 interface and is bus-powered, eliminating the need for an external power adapter. Built-in password protection and automatic backup scheduling help keep your data safe without extra software hassle. It is also verified compatible with PlayStation 4 and PlayStation 5, making it a versatile storage expansion option for gamers. Measuring just 115.3 x 80 x 20.9 mm and weighing 268 grams, this drive is compact enough to slip into a laptop bag. It comes with a 3-year limited warranty and includes a 3-year data recovery service from Seagate's own lab, adding peace of mind for users who worry about accidental data loss.

Compatibility Guide

The Seagate One Touch connects via USB 3.0 (backward compatible with USB 2.0) and works with any device that has a USB-A port. It is pre-formatted as NTFS for Windows, but can be reformatted for macOS or game consoles. Supported OS: Windows, macOS (after reformatting) Game consoles: PlayStation 4, PlayStation 5 (tested and confirmed) Form factor: 2.5-inch internal drive inside a portable enclosure Power: USB bus-powered (no AC adapter required) * Included cable: USB 3.0 Type-A to Micro-B, 46 cm Note that TV recording data is excluded from the data recovery service. Also, if you plan to use the drive with a modern laptop that only has USB-C ports, you will need a USB-A to USB-C adapter or hub.

Product Info

The Seagate One Touch 4TB STKZ4000400 sits in the entry-to-mid range of portable external HDDs. It launched around 2021 and remains a popular choice for users who need large capacity at a reasonable price (typically around ¥30,000 in Japan). Capacity: 4TB Interface: USB 3.0 (USB 2.0 compatible) Rotational speed: Not officially disclosed (likely 5400 RPM) Dimensions: 115.3 x 80 x 20.9 mm Weight: 268 g Warranty: 3 years (domestic authorized products) Data recovery service: 3 years included (Seagate lab) Accessories: USB 3.0 cable, quick start guide Its market positioning is as a reliable, no-fuss backup drive for general consumers and console gamers who value capacity and data protection over raw speed.

Best Use Cases

PC backup for home users: The included automatic backup software makes it easy to schedule regular backups. Ideal for users who want a set-and-forget solution for photos, documents, and media. PlayStation 4/5 storage expansion: Verified compatibility means you can plug it in and start storing PS4 games or PS5 game data. Great for gamers who have filled their internal SSD. Portable data transport for laptop users: Lightweight and bus-powered, it's perfect for carrying large files between work and home without needing an extra power brick. Budget-conscious large-capacity storage: If you need 4TB on a tight budget and speed isn't critical, this HDD offers the best cost per gigabyte compared to external SSDs. Who should NOT buy it? Users who need fast transfer speeds for video editing or heavy file transfers should look at external SSDs instead. Also, if your laptop only has USB-C ports, be prepared to buy an adapter.

Things to Consider

The main limitation of this drive is its HDD-based speed. Sequential read/write speeds are around 100–150 MB/s, which is fine for backups and media storage but slow for running applications or games directly. For game loading times, an external SSD would be much faster. Another point: the included USB cable has a Type-A connector. If your computer only has USB-C ports (common on modern ultrabooks), you will need a separate adapter or hub. The drive itself is USB 3.0, not USB-C, so it won't benefit from USB-C's higher power delivery or alternate modes. Compared to competitors like the WD My Passport or Toshiba Canvio, the Seagate One Touch stands out by including a 3-year data recovery service at no extra cost. However, that service excludes TV recording data, so check the fine print if you plan to use it with a TV recorder. ## FAQ
Q: Can I use this drive with a PlayStation 5? A: Yes, it is officially tested and works with PS5. You can store PS4 games and PS5 game data on it, but you cannot play PS5 games directly from the external HDD due to speed limitations. Q: Does it work with Mac out of the box? A: No, it comes formatted as NTFS for Windows. To use it with macOS, you need to reformat it to exFAT or APFS using Disk Utility. This will erase all data, so do it before storing files. Q: How does the password protection work? A: Install the Seagate Toolkit software on your computer, then set a password for the drive. After that, every time you connect the drive, you must enter the password to access the files. This works on both Windows and macOS.

Product Disclosure (Amazon)

  • Manufacturer: シーゲイト(SEAGATE)
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B094R1YV68
  • Note: This article covers a manufacturer-made product based on Amazon listing details.