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Black rectangular portable SSD with integrated cable and front-facing keypad

Apricorn

Apricorn Aegis Fortress A25-3PL256-S4000F 4TB portable SSD

SKU CH-8DPN-9GMST MPN A25-3PL256-S4000F

A hardware-encrypted 4TB portable SSD with onboard keypad PIN access and FIPS 140-2 Level 2 validation

  • Total capacity4 TB
  • Interface typeUSB 3.0
  • Cache memory8 MB DRAM
  • Setup requirementsCompatible with all Operating Systems, including Windows, Ma
  • Storage temperature range-40 °C to 70 °C
  • Operating humidity range95% humidity at temperatures under 131 degree F (55 degree C
  • Hardware encryption protects every file automatically
  • 256-bit AES-XTS encryption validated to FIPS 140-2 Level 2
  • Onboard keypad stops software and hardware key logging
  • Solid-state design survives 1500 G shock and 20 G vibration
  • Works from -40 °C to 70 °C with 95 % humidity tolerance

Secure portable storage

The Apricorn Aegis Fortress A25-3PL256-S4000F is a 4TB external solid state drive built for users who need hardware-based data protection without software installation. It suits professionals handling sensitive information across Windows, Mac and Linux systems where admin rights are unavailable. The integrated USB 3.0 cable and bus-powered design make it practical for mobile workflows requiring immediate, encrypted access.

Silent bus-powered operation

With no moving parts the drive runs completely silent and draws 100% of its power from the host USB port. It operates reliably in humidity up to 95% at 55°C and survives storage temperatures from -40°C to +70°C. Shock resistance is rated at 1500G for 0.5ms and vibration resistance at 20G across 20-2000Hz, so normal transport and field use pose no thermal or mechanical risk.

Replaces unencrypted external drives

This drive upgrades from any portable SSD or hard drive that relies on software encryption or offers no encryption at all. The jump is worth it when data must meet FIPS 140-2 Level 2 validation, when keypad entry eliminates key-logging risk, or when epoxy-protected circuitry is required for physical tamper evidence. It is not for buyers who need higher interface bandwidth than USB 3.0 provides.

How it compares

Measured against everything we stock in Portable USB SSDs, at today’s prices. Recalculated every night.

Price $1,707.99
Pricier than about 91% of the 410 comparable items (median $202.99).
Total capacity 4 TB
Higher than about 90% of the 311 comparable items (median 1 TB).
Price per TB $427.00 per TB
Pricier than about 93% of the 310 comparable items (median $142.00 per TB).

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Specifications

Product
Brand nameApricorn
Product lineAegis Fortress
Model nameA25-3PL256-S4000F
Total capacity4 TB
Product colorBlack
Storage
Cache memory8 MB DRAM
Ports & slots
Interface typeUSB 3.0
Size & build
Shipping weight0.36 kg
Package size203 × 152 × 76 mm
Environment & compliance
Storage temperature range-40 °C to 70 °C
Operating humidity range95% humidity at temperatures under 131 degree F (55 degree C)
Max shock tolerance1500G/0.5 ms / Virtually shock and vibration resistant
Vibration tolerance20G/20-2000 Hz

Questions about this item

How do I install the Apricorn Aegis Fortress 4TB drive and what step is often missed?

Plug the integrated USB 3.0 cable into a powered port, enter the default Admin PIN from the label, then immediately create a personal User PIN; skipping the User PIN creation leaves the drive on the factory default.

What maintenance or replacement will the Apricorn Aegis Fortress 4TB need later?

No moving parts mean no mechanical wear; the 256-bit AES hardware encryption and epoxy-protected circuitry require no service, so only the USB cable or port may need attention if damaged.

What limit appears first on the Apricorn Aegis Fortress 4TB during sustained use?

The USB 3.0 interface caps transfer speed, and the drive operates up to 55 °C (131 °F) with 95 % humidity tolerance before thermal throttling or safety shutdown engages.

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