OWC Flex 1U4 4-Bay Thunderbolt RAID Expansion Enclosure

BH #OWCTB3F1U000 • MFR #OWCTB3F1U00000
Print
OWC Flex 1U4 4-Bay Thunderbolt RAID Expansion Enclosure
Key Features
  • 4 x 2.5/3.5" SATA III / U.2 Drive Bays
  • 2 x Thunderbolt 3 Ports
  • 2 x USB-C 3.2 Gen 2
  • 3 x USB-A 3.2 Gen 2
Bring adaptive and streamlined storage to your RAID setup with the Flex 1U4 4-Bay Thunderbolt RAID Expansion Enclosure from OWC. Sporting four 2.5/3.5" drive bays, the Flex 1U4 supports SATA III and U.2 drive interfaces. M.2 and 2.5 and 3.5" SAS drives can also be used via a compatible adapter or SAS drive controller card, available separately. Connect to a host and daisy chain via two Thunderbolt 3 ports; one port supports up to 15W of power, while the other supports up to 85W. Connect to wired peripherals or additional storage via two 15W USB-C 3.2 Gen 2 or three USB-A 3.2 Gen 2 ports.
More Details
In Stock
No Store Display
$979.99
Calculate Shipping
Protect Your Gear
Add a protection plan from $69.99
Ask an Expert
212-444-6615

OWC Flex 1U4 External HDD/SSD Overview

Bring adaptive and streamlined storage to your RAID setup with the Flex 1U4 4-Bay Thunderbolt RAID Expansion Enclosure from OWC. Sporting four 2.5/3.5" drive bays, the Flex 1U4 supports SATA III and U.2 drive interfaces. M.2 and 2.5 and 3.5" SAS drives can also be used via a compatible adapter or SAS drive controller card, available separately. Connect to a host and daisy chain via two Thunderbolt 3 ports; one port supports up to 15W of power, while the other supports up to 85W. Connect to wired peripherals or additional storage via two 15W USB-C 3.2 Gen 2 or three USB-A 3.2 Gen 2 ports.

Use the DisplayPort 1.4 interface or Thunderbolt 3 ports to output video to a single 5K or 8K display at 60 Hz, a 4K display at 120 Hz, or dual 4K displays at 60 Hz. A PCIe 3.0 x16 slot allows for easy expansion or upgraded performance, while three cooling fans ensure temperatures are kept in check. A 1 RU rackmount design allows for easy integration into existing rack setups, and the included mounting hardware facilitates hassle-free installation in 18 to 26" racks and cabinets. Along with OWC SoftRAID XT software, this RAID expansion enclosure comes with a 1-year subscription for Acronis Cyber Protect Home Office. The OWC Flex 1U4 4-Bay Thunderbolt RAID Expansion Enclosure is compatible with macOS 10.15 and later.

Note:
This enclosure is not compatible with Windows.
Flexible by Nature
Add new drives, connect different devices, and install a half-length full-height single-width PCIe x16 card of your choice, like a 10 GbE networking card or the OWC Accelsior 4M2 SSD for expanded performance storage capacity, both available separately.
Optimized for Rackmount Environments
The OWC Flex 1U4 is like a productivity supercharger for new or existing rack environments powered by a rack Mac Pro, MacBook Pro, or even a Mac mini.

  • In school: perfect for taming ever-growing collections of digital files with easy integration and future drive capacity and performance scalability
  • At work: adds Thunderbolt speed and swappable drives to server closets, server rooms, or colocation center backup capabilities
  • On stage: handles all the storage and peripheral connectivity pros require for live performances
  • On set: easily fits into mobile D.I.T. carts to capture multi-stream, high-resolution footage at full frame rates while daisy-chaining up to five additional Thunderbolt devices
  • In studio: expands storage and connectivity options of fixed racks
  • At home: great for installers creating a high-performance home entertainment server closet
U.2 Support
Complete massive backups faster, stream content during a live performance, edit large format video, or run high transactional and complex calculation applications by taking advantage of U.2 NVMe SSDs and the OWC ecosystem of U.2 drives and adapters. U.2 NVMe drives are specifically designed to maximize the PCIe bus and deliver transfer speeds up to 2750 MB/s when combined with Thunderbolt.
A Complete Swap and Share Ecosystem
The OWC Flex 1U4 goes with the flow when needing to move data outside or beyond the local network. With the OWC U.2 ecosystem, moving and sharing data is fast and easy. Swap out and ship a project from field to post in video production workflows. Move backup data to an offline colocation for backup workflows. The combination of OWC Flex 1U4 and the OWC U.2 ecosystem opens a new dimension to data transfer possibilities.
Ready to Rack
The Flex 1U4 comes complete with hardware for mounting into most racks and cabinets.
RAID Made Easy
Harness the full capability of your OWC Flex 1U4 drive array with the included SoftRAID XT, the most powerful, intuitive RAID management software on the market for macOS and Windows. SoftRAID's RAID creation and management technology is optimized for data protection and drive performance. It is packed with features like multiple RAID options, validation and verification of drives, and predictive disk failure with SoftRAID Monitor.

SoftRAID provides a level of storage performance that you simply can't get with hardware RAID and is ideal for anyone who needs to safely store and backup massive amounts of data, including educational institutions, government agencies, businesses, content creators, and media and entertainment professionals. If you need even more power and flexibility, you can upgrade to SoftRAID Pro to spread volumes over two or more disk enclosures for incredible performance that would be impossible with hardware-based RAID.

Certified for Demanding Use
OWC Flex 1U4 solutions go through a multi-step performance certification prior to shipping. This ensures they arrive operating properly and immediately ready for demanding use.
Reliable Performance
Built for reliability and performance, OWC enclosures are rigorously quality tested and backed by global customer support.
USB 3.2 Gen 2
Doubling the speed of its predecessor, USB 3.2 Gen 2 features a maximum throughput of 10 Gb/s when used with compatible devices and is synonymous with USB 3.1 Gen 2.
Thunderbolt 3
Thunderbolt 3 is a hardware interface that utilizes the reversible USB-C connector. Doubling the speed of its predecessor, Thunderbolt 3 features a maximum throughput of 40 Gb/s when used with compatible devices. The connector also transmits data via USB 3.2 Gen 2 at up to 10 Gb/s, and dual-bandwidth DisplayPort 1.2 allows you to connect up to two 4K displays simultaneously. Additionally, you can daisy chain up to six devices from a single Thunderbolt 3 port.
UPC: 810100980252

OWC Flex 1U4 External HDD/SSD Specs

General
Number of Bays
4x 2.5"/3.5" SAS (Unspecified Version), SATA III, U.2
Inputs/Outputs
2x USB-C Thunderbolt 3 (40 Gb/s)
2x USB-C 3.1/3.2 Gen 2
3x USB-A 3.1/3.2 Gen 2
1x DisplayPort 1.4
Media Card Slots
No
PCI Expansion
1x PCIe 3.0 x16 (x4 Electrical)
Electrical
Input Power
90 to 264 VAC, 50 / 60 Hz at 1.8 to 3.5 A
PSU
300
Physical
Operating Conditions
50 to 95°F / 10 to 35°C at 8 to 90% Humidity
Storage Conditions
-40 to 149°F / -40 to 65°C at 5 to 95% Humidity
Certifications
BSMI, CE, FCC, RCM, VCCI
Cooling
3x Fans
Cable Length
2.3' / 0.7 m
Dimensions
18 x 16.9 x 1.7" / 45.6 x 43 x 4.4 cm
Weight
16.3 lb / 7.4 kg (without Drives)
Packaging Info
Package Weight
23.9 lb
Box Dimensions (LxWxH)
26 x 25.5 x 10.5"

OWC Flex 1U4 External HDD/SSD Reviews

Works Well, Just Beware Of The Fan Noise

By Patrick
Rated 3 out of 5
Date: 2025-10-31

I Got This To Hold All My Various Internal Drives After Migrating From A Mac Pro To A Mac Studio. The Fact That It Can Hold All Sorts Of Drives, Plus A PCIe Card, Really Sold It For Me. As Far As I Know, No Other Product Is Available Anywhere. I Also Like That It Is Rack Mounted. However, Upon Starting It Up I Was Very Disappointed In How Loud This Thing Is. There Is A Continuous Whirring As Soon As It Is Powered On, I Measured It To 48dB At About 3 Ft Away. As I Am Working With Audio Production, Where Silence Is Critical, This Setup Is Unacceptable To Me. The Fan Noise Is Just Way Too Loud. The Silver Lining Is That The Noise Is Constant, And Doesn't Increase Or Decrease Under Workload. Unfortunately, There Is Nothing Else On The Market That Can Do What This Thing Does, At Least Not Without Any Fan Noise Of Its Own. So, I Will Need To Build A Soundproof Rack Closet Of Some Sort, Or Just Move It To Another Room And Have A Very Long Thunderbolt Cable Back To My Studio. Functionality: 5 Stars. Usability: 2 Stars

See any errors on this page?
Whatever You Need, We've Got It