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Rectangular black portable SSD with integrated USB cable and keypad, 3 by 4.8 by 0.65 inches

Apricorn

Apricorn AFL3-S4TB 4TB portable SSD

SKU CH-GYPZ-8Y2NM MPN AFL3-S4TB

Hardware-encrypted 4TB portable SSD with USB 3.2 Gen 1 interface, rated for -40°C to +70°C operation and 1500G shock resistance

  • Total capacity4 TB
  • Interface typeUSB 3.2 Gen 1
  • Operating temperature range-40 °C to 70 °C
  • Max shock tolerance1500G/0.5 ms | Virtually shock and vibration resistant
  • Vibration tolerance20G/20-2000 Hz
  • Product depth4.8 in (12.2 cm)
  • 4TB capacity stores large datasets securely
  • USB 3.2 Gen 1 interface enables fast transfers
  • 1500G shock resistance protects data during drops
  • Operates from -40°C to +70°C in harsh environments
  • Compact 3.00" x 4.80" x .65" design fits anywhere

Encrypted 4TB portable SSD

The Apricorn Aegis Fortress L3 AFL3-S4TB is a 4TB external solid-state drive that connects through a USB 3.2 Gen 1 interface. Hardware-based encryption protects stored data without requiring software installation on the host computer. The drive is designed for users who need secure, high-capacity storage that can be moved between systems quickly.

Ruggedised construction for harsh environments

The enclosure is rated to survive shocks of 1500G for 0.5ms and vibration of 20G across a 20 to 2000Hz range. An operating temperature window of -40°C to +70°C allows use in extreme cold or heat. These specifications mean the drive can remain functional in field conditions that would damage conventional portable storage.

Suited for mobile professionals needing hardware

Workers who transport sensitive data between locations benefit from the built-in security and physical durability. Buyers who require faster transfer speeds than USB 3.2 Gen 1 provides, or who need a different capacity point, should evaluate alternative drives that match those specific requirements.

How it compares

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

Price $2,081.99
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 $520.50 per TB
Pricier than about 95% of the 310 comparable items (median $142.00 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameApricorn
Product lineAegis Fortress L3
Model nameAFL3-S4 TB
Total capacity4 TB
Ports & slots
Interface typeUSB 3.2 Gen 1
Size & build
Overall width3 in (7.62 cm)
Product depth4.8 in (12.2 cm)
Overall height0.65 in (1.65 cm)
Shipping weight0.68 kg
Package size173 × 102 × 38 mm
Environment & compliance
Operating temperature range-40 °C to 70 °C
Max shock tolerance1500G/0.5 ms | Virtually shock and vibration resistant
Vibration tolerance20G/20-2000 Hz

Questions about this item

Will the internal flash memory or controller need replacement after a certain amount of data written?

The drive uses solid-state storage with no moving parts, so no mechanical components require replacement under normal use.

Does the USB 3.2 Gen 1 interface limit sustained transfer speeds before the drive itself does?

Yes, the USB 3.2 Gen 1 connection caps maximum throughput at 5 Gbps, which is reached before the internal SSD hits its own limits.

How much heat does the metal enclosure produce during all-day operation?

The drive is rated to operate from -40°C to +70°C, so the enclosure stays within safe temperatures during continuous use.

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