Apricorn Aegis Fortress L3 4000 GB Black
Product Technical Specification
Storage Capacity | 4 TB |
Connection Interface | 1 x USB 3.2 / USB 3.1 Gen 1 (USB Micro-B) |
Encryption | 256-Bit XTS-AES, FIPS 140-2 Level 3 |
Type | Hard Disk Drive |
Rotational Speed | 5400 rpm |
Cache Memory | 8 MB |
Security Features | Password Protection |
Power Source | USB Bus Power |
Material | Aluminum |
Certifications | CCC, CE, FCC, RoHS, VCCI, WEEE, as per Manufacturer |
Dimensions (L x W x H) | 1.0 x 3.0 x 4.8" / 24.5 x 77.0 x 122.0 mm |
Weight | 13.7 oz / 388.39 g |
Package Weight | 1.33 lb |
Box Dimensions (LxWxH) | 7.8 x 5.9 x 2.7" |
Delivery Options

Economy Delivery (UK)

Fast & Tracked by Courier (UK)
Keep your mission-critical data safe while you're on the go with the 4TB Aegis Fortress L3 FIPS 140-2 Level 3 Encrypted Portable Hard Drive from Apricorn. This portable 4TB hard drive comes equipped with a USB 3.1 Gen 1 Micro-B interface as well as an aircraft-grade 6061 aluminum-alloy shell and an integrated, wear-resistant 10-digit keyboard for entering a programmable PIN. USB Type-A and Type-C cables are included.
Designed to meet FIPS 140-2 Level 3 standards, the drive protects your data with real-time AES-XTS 256-bit encryption. Forced enrollment helps to ensure that the drive can't be used without programming a PIN, while an auto-lock feature automatically locks the drive after it's left unattended for a predetermined period of time. The drive is also designed to wipe itself after a set number of incorrect PIN entry attempts.
Designed to Meet NIST FIPS 140-2 Level 3 Requirements
The hard drive, electronics, external fasteners, and the enclosure itself are all included within this elevated FIPS validation boundary. The tamper-resistant enclosure is milled from a solid block of aircraft-grade 6061 aluminum alloy. Also included are snap-off uni-directional security fasteners and a membrane-style keypad.
Military-Grade 100% Hardware Encryption
Featuring AES-XTS 256-bit hardware encryption, the Aegis Fortress L3 seamlessly encrypts all data as it's being written to the drive on the fly and it's designed to protect your data even if the hard drive is extracted from its enclosure.
Software-Free Design
The Aegis Fortress L3 is ready to use right out of the box; no software, drivers, or updates needed. The drive is compatible with Windows, macOS, Linux, or most mass storage-compliant systems with a powered USB port.
Forced Enrollment
The Fortress L3 has no factory-preset default PIN. With forced enrollment, the administrator is required to establish a sufficiently complex PIN before the device can be set up or used.
Configurable
Create custom profiles and mass configure multiple Aegis devices at once with Apricorn's Aegis Configurator (sold separately).
Onboard Keypad
All PIN entries are performed on the device's keypad, making it compatible with systems without keyboards. The drive shares no critical security parameters with its host computer.
Lock-Override Mode
The Fortress L3 is designated for specific cases in which the drive needs to remain unlocked, such as during reboot, passing the drive through a virtual machine, or other situations that would normally prompt the drive to automatically lock. When enabled, lock-override mode allows the L3 to remain unlocked through USB port re-enumeration and will not re-lock until USB power is interrupted or the lock button is pressed.
Two Read-Only Modes
Particularly important in forensics, read-only mode is ideal for applications that require data to be preserved in its original, unaltered state and can't be overwritten or modified. The Fortress has two read-only modes. The first is set within the administrator mode and can only be enabled or disabled with the administrator PIN. The second read-only mode can be set and disabled by anyone with a valid PIN.
Data Recovery PINs
In the case of lost or forgotten user PINs, up to four single-use data recovery PINs can be programmed and used to restore access to the data on the drive.
Brute Force Protection
After a predetermined number of consecutive incorrect PIN entry attempts (programmable, up to 20), the L3 will conclude that it is under brute-force attack and will respond by performing a crypto-erase, deleting the encryption key and thus rendering all the drive's data useless.
Environmental Resistance
Designed with protection in mind, the Aegis Fortress L3's keypad is resistant to dust, grit, and water. The buttons coated with a durable polymer that defends against surface wear, ideal for preventing hackers from guessing the drive's most frequently used buttons.
Programmable Minimum PIN Length
For added PIN length and enhanced security, the minimum PIN length requirement can be increased from 7 characters up to 16.
LED Flicker Button Confirm
Indicates positive button entry with visual LED confirmation.
Unattended Auto Lock
Automatically locks after a predetermined amount of time or interruption of USB hub power.
Drive Reset Feature
Offers an infinite number of resets and performs a crypto-erase with new encryption key regeneration.
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Storage Capacity | 4 TB |
Connection Interface | 1 x USB 3.2 / USB 3.1 Gen 1 (USB Micro-B) |
Encryption | 256-Bit XTS-AES, FIPS 140-2 Level 3 |
Type | Hard Disk Drive |
Rotational Speed | 5400 rpm |
Cache Memory | 8 MB |
Security Features | Password Protection |
Power Source | USB Bus Power |
Material | Aluminum |
Certifications | CCC, CE, FCC, RoHS, VCCI, WEEE, as per Manufacturer |
Dimensions (L x W x H) | 1.0 x 3.0 x 4.8" / 24.5 x 77.0 x 122.0 mm |
Weight | 13.7 oz / 388.39 g |
Package Weight | 1.33 lb |
Box Dimensions (LxWxH) | 7.8 x 5.9 x 2.7" |
Buykingston order despatch times:
We will despatch your order the very same day if we receive cleared payment by 12:00 pm Mon-Fri.
These delivery estimates apply when you order up to 12:00 pm Mon-Fri (excluding public holidays).
We charge a one off delivery cost as outlined below regardless of how many items you order or the weight of your order.
Estimated delivery times are provided to us by the respective delivery companies. We pass this information onto you, the customer.
Despatch times do not apply to UK public holidays.
Estimated delivery times are taken from the next available working day available for delivery. For example if an order was despatched on a working Wednesday by 3pm, the first available working day for delivery would be Thursday provided you placed your order by 3pm on the Wednesday. If the next available weekday is a UK bank holiday/public holiday then your order will be despatched on the next available working day.
Our warehouse reserves the right to upgrade the delivery method you select on your order.
Our available delivery options*
Contact us for a shipping quote.
*All delivery times are estimated unless stated.
Product Returns Note
Buykingston offers a very flexible and hassle free returns policy. If
for whatever reason you are not happy with the item purchased you can return
it to us within 12months for a refund (for unused and unopened
items) or within 30 days on opened and used items for a refund. This
applies to items purchased direct through Buykingston only.
Our 30 Day Returns Money Back Guarantee Satisfaction
Guarantee:
For items opened and used and that are returned in a resellable
condition.
Our 365 Day Returns Money Back Guarantee Satisfaction
Guarantee:
For items that remain sealed and unused.
Some items are excluded from our moneyback guarantee unless they have developed a fault. These include;
- Headphones
- Earphones
- Custom made and designed products such as flash memory products with
custom logo’s on them. E,g USB flash drives and memory cards with your own
logo
Returns FAQs
What is your returns criteria?
On opened items 30 days from date of receipt or expected date of receipt on
non tracked items.
On unopened items 365 days.
How do i go about returning my order?
Please contact us via our contact page with
your order number where we will present you with an RMA number and returns
label.
Do i need to contact you before returning my order?
Yes, to obtain an RMA number.
Does my item have to include its original packaging?
Yes for items that fall within our 30 day money back guarantee and our 365
day returns. Of course for faulty items we realise you may no longer have
the packaging.
Who deals with the warranty on a faulty item?
We will. In some circumstances we may ask you to contact the manufacturer
direct for assistance.
Please ensure you have read and comply in full with Section 11 & 13 of our terms and conditions which you can read here in full.