here!
I’m your shopping assistant for PC builds, upgrades, and everything tech.
Got questions? Ask away!
Start a conversation
Best Sellers
Top Rated- $2,849.00
Hot Seller- $2,929.00
- + FREE SHIPPING
- $2,929.00
- + FREE SHIPPING
Apricorn Aegis Fortress A25-3PL256-S4000F 4TB External Solid State Drive
- Tested and Validated by the National Institute of Standards and Technology (NIST), the Aegis Fortress is validated to meet the Federal Information Processing Standards (FIPS) 140-2 Level 2 specification.
- Featuring 256-bit AES-XTS hardware encryption, the Aegis Fortress seamlessly encrypts all data on the drive in real-time, keeping your data safe even if the solid state drive is removed from its enclosure.
- With an easy-to-use keypad design and software free setup, it enables you to access the drive with your own unique PIN. The embedded keypad prevents hardware and software key logging attempts to capture your password entered via the host system.
- The encryption chip and circuitry are completely protected by a super tough epoxy compound, which is virtually impossible to remove without causing permanent damage to the electronics.
+
+
Overview
Specs
Reviews
See all Q & A 
Any questions? Ask CelesteSM will help you find out quickly.
Try me now
This drive is tested on 11 cryptographic levels. All data on the drive is protected with real-time hardware AES-XTS encryption, and with no software required for installation or operation this drive needs no ADMIN rights. With no moving parts, this drive is drop and vibration resistant, unaffected by high humidity and works in extremes of temperature. Impervious to key logging attacks, you access the drive with your own unique PIN via an onboard keypad. Combine this with a USB 3.0 integrated cable and Solid State performance, and you have one powerful drive.
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 3 years
- Limited Warranty period (labor): 3 years
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-458-5448
- Support Website
- View other products from Apricorn
LOADING...
LOADING...
The Apricorn Aegis Fortress A25-3PL256-S4000F is a 4TB external SSD with FIPS 140-2 Level 2 validation, 256-bit AES-XTS hardware encryption, and keypad PIN access, suited to people who need to protect sensitive files on portable storage.
Recommended For
- IT, healthcare, government, and other compliance-focused staff who carry sensitive files between workstations and need PIN access and hardware encryption without installing host-computer security software.
- Mobile professionals who regularly move confidential client, financial, or business files between locations and want the drive to unlock with its own keypad rather than rely on software installed on each computer.
- People making offline or air-gapped backups of sensitive documents who want a portable, bus-powered drive that can be locked when disconnected and used across Windows, Mac, or Linux systems.
- Users transferring large files among older or mixed-computer environments who value keypad-based, software-free access and broad USB compatibility more than top-tier external SSD throughput.
Real-World Use Scenarios
- Keep confidential work files or backups on a portable drive: set a PIN on the drive, then lock it when it is not in use; if the drive is lost, its contents remain encrypted rather than being immediately readable like files on an ordinary unlocked drive.
- Move sensitive files between Windows, Mac, and Linux computers without installing drive-unlock software on each host: enter the PIN on the keypad, then use the unlocked drive as external storage. The files still need a compatible filesystem and USB connection.
- Make an offline copy of sensitive files for backup rotation: copy the data, lock and disconnect the drive, then store it separately from the computer. This keeps the backup portable and PIN-protected while it is disconnected, though it does not replace keeping another backup copy.
- Back up client photos or video while working on location: transfer the files to the drive, lock it before leaving, and take the copy with you. A review of the Fortress L3 describes this kind of shoot-to-backup workflow; the exact transfer experience can vary by computer and connection.
- Carry regulated or otherwise sensitive files between work locations when an organization requires validated encryption: unlock the drive with its keypad when needed and lock it again after use. Confirm that the organization accepts this specific model and its validation level before relying on it for compliance.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Portable 4TB external SSD storage for business or personal use, with hardware-encrypted data |
| Capacity And Form Factor | 4TB solid-state storage in a 2.5-inch form factor |
| Interface And Compatibility | USB 3.0; backward compatible with USB 2.0 and 1.1. Compatible with Windows, Mac, Linux, Unix, and PC systems; requires a USB port |
| Security And Validation | 256-bit AES hardware encryption; FIPS 140-2 Level 2 validated, with FC and CE approvals |
| Performance And Cache | 8MB DRAM cache and 0.1ms average access time |
| Power And Portability | Bus-powered; portable external drive |
| Durability And Operating Conditions | Virtually shock- and vibration-resistant; maximum shock resistance of 1500G/0.5ms and vibration resistance of 20G/20–2000Hz. Storage temperature: -40°C to +70°C; operating humidity: 95% below 55°C |
| Physical Design | Black enclosure |
| Model Identifiers | Apricorn Aegis Fortress, model A25-3PL256-S4000F |
Reference Q&A
Q: Apricorn Aegis Fortress or Samsung T7 Shield: which should I choose?
A: Choose the Apricorn Aegis Fortress when you need PIN entry on the drive itself, software-free access, and FIPS 140-2 Level 2 validation. Choose the Samsung T7 Shield when transfer speed is the priority: Samsung rates it for up to 1,050 MB/s reads and 1,000 MB/s writes, compared with Apricorn’s stated maximum of 360 MB/s for the Fortress SSD. The T7 Shield’s password protection is managed through Samsung software.
Q: Should I get the Aegis Fortress or the Aegis Fortress L3?
A: Choose this Aegis Fortress if FIPS 140-2 Level 2 validation and keypad-based, software-free access meet your requirements. Choose the Fortress L3 if your security requirements specifically call for FIPS 140-2 Level 3 validation; its listed features also include USB-A and USB-C cables and recovery PINs. Confirm the required certification level before buying, because Level 2 and Level 3 are different specifications.
Q: Is the 4TB Aegis Fortress worth choosing over the 2TB version?
A: Choose the 4TB version if you need more space for a single portable drive or want to reduce the number of drives you carry. Choose 2TB if that capacity is sufficient. Apricorn lists both capacities in the Fortress SSD range; the available datasheet does not establish a performance advantage for either capacity.
Q: Should I buy the Aegis Fortress or a regular portable SSD?
A: Choose the Aegis Fortress when you need its keypad authentication, hardware encryption, software-free setup, and FIPS 140-2 Level 2 validation. A performance-focused portable SSD may be a better fit if you mainly transfer large files and do not need those security features: Apricorn specifies up to 360 MB/s for the Fortress SSD, while the Samsung T7 Shield is rated for up to 1,050 MB/s reads and 1,000 MB/s writes.
Q: Will this drive work with Windows, Mac, and Linux?
A: Yes. The drive is specified for Windows, Mac, and Linux and connects through USB. It supports USB 3.0 for maximum interface speed and is backward compatible with USB 2.0 and 1.1.
Q: Does the drive need a separate power adapter?
A: No. It is 100% bus powered, so it draws power through its USB connection rather than requiring a separate power adapter.
Q: Do I need to install encryption software to protect files on this drive?
A: No. The drive uses onboard hardware encryption and keypad PIN access, with software-free setup. Its 256-bit AES-XTS encryption operates in real time; the product is specified as FIPS 140-2 Level 2 validated.
Q: Is this a practical drive to carry for work or travel?
A: It is designed as a portable external SSD and is bus powered, so it does not need a separate power adapter. Its keypad PIN access and stated shock resistance may suit carrying sensitive files, but it connects over USB 3.0 and the provided specifications do not state that it is water resistant.
Q: Can I use the drive between computers without installing encryption software?
A: Yes. The drive uses keypad-based hardware encryption and software-free setup; after it is unlocked, it works as USB storage. The listed system support includes Windows, Mac, and Linux. Confirm the connection type and port support on each host.
Q: Is hardware encryption worth choosing over software encryption?
A: It may suit users who need keypad access, host-independent unlocking, or FIPS 140-2 Level 2 validation. If those are not requirements, Reddit discussions also consider software encryption as an alternative; this product’s main trade-off is its specialized security-focused design.
Q: Is an Apricorn keypad drive suitable for carrying sensitive work files between systems?
A: It is a relevant option when you need portable storage with PIN access and hardware encryption. The product is bus-powered and lists Windows, Mac, and Linux compatibility; a Reddit discussion describes Apricorn drives being used for work and transfers between computers. Check your organization’s security and device policies before using it.