Transcend External HDD 4TB – Iron Grey (TS4TSJ25M3S)

The Transcend StoreJet 25M3S 4TB (TS4TSJ25M3S) is a rugged, high-capacity portable external hard drive designed for professionals, students, and users who need reliable storage with military-grade protection. Featuring a three-stage shock protection system and a high-speed USB 3.1 Gen 1 interface, this 2.5-inch mechanical HDD combines durability, speed, and data security. The “S” model is a slimmer, lighter revision of the original StoreJet 25M3, making it ideal for those who need both high-capacity storage and portability.

Product Features

High-Speed Data Transfer

The drive uses a USB 3.1 Gen 1 interface (USB 3.2 Gen 1), supporting theoretical transfer speeds up to 5Gbps. Real-world sequential read/write speeds typically range from 100–130 MB/s, making it efficient for transferring large files.

Military-Grade Shock Protection

Certified to MIL-STD-810G 516.6 U.S. military drop-test standards, the StoreJet 25M3S employs a three-stage protection system:

• Outer Layer: Vibration-absorbing silicone rubber case for impact absorption.
• Middle Layer: Reinforced hard casing to distribute impact forces.
• Inner Layer: Internal suspension damper that stabilizes the HDD to protect spinning platters.

One-Touch Auto-Backup and Quick Reconnect

The drive features a dedicated backup button for instant data synchronization with Transcend Elite software. The same button also allows quick reconnection after safe removal without needing to unplug the cable.

Data Security and AES Encryption

Supports 256-bit AES file and folder encryption through Transcend Elite software, providing secure protection for sensitive data. Disk locking functionality is also available via the software.

Power Management

Includes an automatic power-saving sleep mode that activates after 10 minutes of inactivity, conserving energy and extending the life of the drive.

Product Specifications

• Storage Capacity: 4TB (4000GB)
• Interface: USB 3.1 Gen 1 (USB 3.2 Gen 1), backward compatible with USB 2.0
• Physical Connector: Micro-USB Type B with included Micro-USB to USB Type-A cable
• Storage Media: 2.5-inch mechanical HDD, 5400 RPM
• Transfer Speeds: Theoretical maximum 5Gbps; real-world sequential speeds 100–130 MB/s
• Form Factor: 2.5-inch rugged profile
• Dimensions: 129.5 mm x 80.8 mm x 24.1 mm (thicker chassis for 4TB capacity)
• Weight: Approximately 294 g (10.37 oz)
• Shock Protection: Three-stage system (silicone rubber case, reinforced hard casing, internal suspension)
• One-Touch Backup: Physical button for instant synchronization via Transcend Elite
• Quick Reconnect: Re-enable safely removed drives without unplugging the cable
• Data Security: 256-bit AES file/folder encryption and disk locking via software
• Power Management: Auto sleep mode after 10 minutes of inactivity
• Operating Temperature: 5°C to 55°C (41°F to 131°F)
• Software: Transcend Elite and RecoveRx
• System Requirements: Windows 7 or later, macOS 10.10 or later, Linux Kernel 2.6.31 or later
• Certifications: MIL-STD-810G 516.6, CE, FCC, BSMI, KC, RCM, EAC, UKCA