OWC miniStack STX

Stackable Storage + Thunderbolt Hub Xpansion Solution

OWC miniStack STX

Expand Storage


vs. Factory Options



With up to 770MB/s Speed

Add Connectivity

3-Port Hub

40Gb/s Thunderbolt

First Thunderbolt-Certified

Thunderbolt 4

Storage Solution

Mini Sized. Mammoth Possibilities.

Just like great duos Kirk and Spock, Frodo and Sam, or Woody and Buzz, the miniStack and the Mac mini have been the perfect pair since 2005. The miniStack STX now features Storage and Thunderbolt Xpansion, continuing its award-winning legacy as the best sidekick a Mac mini can have. Meet the world’s first Thunderbolt certified Thunderbolt 4 storage solution.

With a universal SATA HDD/SSD bay AND an NVMe M.2 PCIe SSD slot, you can expand your mini’s storage capacity to gigantic proportions. Three Thunderbolt (USB-C) ports enable you to connect to millions of Thunderbolt, USB, and future USB4 drives, displays, A/V mixers, cameras and tablets; as well as desktop accessories like a keyboard, card reader, or mouse. Now the possibilities of how you can use your Mac mini are limited only to your imagination.

OWC miniStack STX with Mac mini

Massive Capacity

Add over 200x greater data storage on top of your Mac mini's built-in storage1

Pro-grade Performance

Save/access/backup data and edit 4K video with up to 770MB/s real-world-tested performance

More Connectivity

Add a mix of up to five Thunderbolt devices, three USB devices, and two displays2,3

Maximum Compatibility

Use with Thunderbolt or USB equipped Macs, PCs, iPads, Chromebooks, Android tablets… virtually anything that supports external storage4

Monitor Drive Health

Monitor your drive health with optional OWC SoftRAID software


An aluminum housing with internal heat sink and high-efficiency cooling fan provides cool, nearly silent operation

Power While Working

96W of notebook charging power via Thunderbolt or USB-C

Easy Backups

Apple Time Machine and Windows File History ready

Plug and Play

Includes Thunderbolt cable

Color-Matched for Your Mac

OWC miniStack STX is all about options – including color. Choose from Matte Silver or Matte Black to match your style.

OWC miniStack STX silver front view
OWC miniStack STX silver back view

Matte Silver

OWC miniStack STX black front view
OWC miniStack STX black back view

Matte Black

Xpands Notebooks, Tablets, and More

Sized identically to the Mac mini, the miniStack STX is also a sleek, complementary companion for MacBook and PC notebook and desktop machines, iPads, and Chromebooks. While highly powerful, these machines are often limited in the number and variety of ports they offer. The miniStack STX solves that expansion limitation with a new world of increased connectivity and storage capacity.

Lineup of Mac, PC, and tablet computers and devices
OWC miniStack STX inside view

The Dual Drive Dynamo

Just like superheroes have an alter ego, so too does the miniStack STX. The universal SATA drive bay holds a hard disk drive or SSD for big capacity data storage. When you need to support low latency instant access operations, the NVMe M.2 SSD slot reveals miniStack STX’s ferocious power. NVMe was designed to deliver the speed potential of modern flash drive technology by using a more direct path to a computer's processor over PCIe (requires Thunderbolt host).5 As a result, you can enjoy near instant access performance with the miniStack STX.

Edit. Save. Access. Like a Pro

With multiple drive configurations available, you can experience up to 770MB/s of real-world data transfer speed. Move 5GB of GoPro footage in about 6 seconds. Transfer 1000s of photos from that priceless event in mere seconds. Use the SATA drive for Time Machine or File History backups while working off the NVMe drive. With heavyweight performance like this, the miniStack STX is great for multi-stream compressed 4K video editing, photography, audio, virtual machines, and everyday data tasks.

Video editing software screenshot
OWC SoftRAID for Mac and PC screenshots and logo

Easily Monitor and Protect Your Data

For even more power and security, add OWC’s SoftRAID software to your miniStack STX.

SoftRAID is the most powerful, intuitive software RAID utility on the market. Multiple RAID levels let you select the RAID level that fits you or your project’s needs best. If you need maximum volume capacity, optimum drive performance, data protection, or a combination of attributes, SoftRAID has you covered.

Packed with features like drive validation, verification and failure prediction—SoftRAID includes features you simply don’t get with hardware RAID. It’s like having a datacenter on your desktop! From home users looking to protect photos and documents to professionals needing to protect and quickly access projects, SoftRAID is the perfect solution.

Dive deeper into the benefits of OWC SoftRAID »

Move Between Macs and PCs

Accessing your miniStack STX on a Windows PC is remarkably easy with the addition of OWC’s MacDrive. This seamless software runs in the background, so there’s nothing to launch or learn. Just connect the miniStack STX and not only do you have instant read access, but full write access too! MacDrive also includes powerful features that enable you to format and partition drives as well as repair basic disk issues.

Learn more about MacDrive »

OWC MacDrive screenshot and logo

A Resolutionary Idea

Whether your computer or tablet is sporting the latest technology or is a few years loved, the OWC miniStack STX gives you multiple options to expand your visual horizons:

Single and Dual Display Support

4K @ 30Hz

4K @ 60Hz

Dual 4K @ 60Hz

5K @ 60Hz
(Apple Studio Display or LG Ultrafine 5K)

Dual 5K @ 60Hz
(Apple Studio Display)

6K @ 60Hz
(Apple Pro XDR)

Dual 6K @ 60Hz
Apple Pro XDR

8K @ 60Hz

Apple silicon Mac (M1, M2)3

Apple silicon Mac (M1 Pro, M1 Max, M1 Ultra, M2 Pro, M2 Max)3

Intel Mac with Thunderbolt 33



iPad Pro or iPad Air with Thunderbolt4

iPad Pro with USB-C4

iPad Air with USB-C4


Windows PC with Thunderbolt 4

Windows PC with Thunderbolt 3 / USB45

Windows PC with USB-C (10Gb/s with DisplayPort)

Windows PC with USB-C (5Gb/s with DisplayPort)

Windows Tablet

  1. See Apple Studio Display specs for detailed Mac model support.
  2. See Apple Pro Display XDR specs for detailed Mac model support.
  3. OWC highly recommends that you verify the display support for your specific Mac model:
  4. OWC highly recommends that you verify the display support for your specific iPad model:
  5. OWC recommends that you verify the display support for your PC's Thunderbolt port. Some refresh rates require DisplayPort 1.4 HBR3 and DSC 1.2 support from the display and the host. Not all Thunderbolt ports support DisplayPort 1.4 – some are limited to DisplayPort 1.2, which may reduce refresh rate or resolution support.
Home music studio

Xpand Your Sonic Journey

Building your music setup can be daunting. With two configurable drives in the OWC miniStack STX, it’s easy to create a storage powerhouse for recording and playback of essential tracks in real-time. You can even store your entire loop and sample libraries on the NVMe SSD for in-a-flash use with near zero latency.5

OWC miniStack STX back view

Xpand Your Connections

You’ll experience newfound freedom when you’re able to connect to nearly any past, present, or future device/accessory via three Thunderbolt (USB-C) ports.2,3,4 Just like the miniStack STX’s innovative storage capability, these three ports have a second superpower: They reinvent the daisy chain by allowing you to create three independent chains with up to five total Thunderbolt devices with a USB device on the end of each chain (for 8 devices total). You can now also remove devices from one chain without affecting the other chain(s).

Xtend Your Investment

If you own a 2018 Intel Mac mini or the latest M1 version, the fact that the internal factory drive can’t be upgraded is no longer a reason to sell your beloved little powerhouse. The miniStack STX maximizes your mini’s investment with a mighty capacity punch for a fraction of the time and money you would spend in buying and setting up a new machine.

If you own a Mac, PC, or device equipped with USB-A only, you’re not left behind. With a USB-C to USB-A adapter cable (available separately), you can utilize the miniStack STX’s SATA drive bay to transfer data to/from your machine plus infuse your trusty setup with additional device connectivity.4,5

OWC miniStack STX with Mac mini on desk

Store from Minutes to Millions

All the features and “technospeak” of an external drive don’t mean a thing if you don’t know how much of a particular file type it can hold. For every 1TB of miniStack STX capacity, you can store up to any of the following:6





41.6 Hrs

of GoPro 4K footage



High Definition Movies


38K / 250K

High / Standard Quality Songs



MS Office Documents

Battery icon

Keeps the Power Flowing

Whether you’re taking a short break or are done for the day, the miniStack STX keeps you powering ahead. No matter if your machine or STX goes into sleep mode, the STX’s Thunderbolt ports continue to power and/or charge connected devices. Your notebook will stay charged and ready too with up to 96 watts of power through its Thunderbolt or USB-C connection.4

OWC Thunderbolt Cable

OWC Thunderbolt Cable Included

OWC miniStack STX comes with a certified 0.3M OWC Thunderbolt Cable. But if your workflow demands a different length to make the connection, OWC Thunderbolt (USB-C) Cables are the perfect choice.

Professional Grade

Professional Grade = Ready to Work

We understand having confidence in gear reliability is paramount to creative professionals. That’s why every miniStack STX goes through a multi-step performance certification prior to shipping. This ensures your miniStack STX arrives operating properly and immediately ready for demanding use.

OWC ClingOn

Work with Ultimate Confidence

Active workspaces expose gear to unexpected bumps and shoves. OWC ClingOn custom cable stabilizers (available separately) screw into the OWC Dock or OWC Drive housing to reduce – if not completely eliminate – cable strain on Thunderbolt and USB-C connections so you can work with ultimate confidence even in the highest foot traffic environments.

OWC, Trusted by Pros & Enthusiasts the World Over

OWC, Trusted by Pros & Enthusiasts the World Over

We build our hardware to the highest standards of reliability and performance. Because 100% reliability is always the goal, we rigorously quality test and back our hardware with a 3 Year OWC Limited Warranty and award-winning customer support.

Learn More
  1. 28TB miniStack STX provides over 218x greater data storage than a 2018 Mac mini with factory equipped 128GB SSD.
  2. Works with Thunderbolt (USB-C), Thunderbolt/Thunderbolt 2 (mDP), and USB devices. Thunderbolt/Thunderbolt 2 (mDP) device support requires a certified Thunderbolt 3 (USB-C) to Thunderbolt 2 (mDP) adapter and a Thunderbolt 2 cable (available separately) and provides data transfer at up to 20Gb/s.
  3. Actual display support depends upon host. Please review the display specifications for your specific host system to determine the maximum supported resolution, refresh rate, color depth, and number of external displays over Thunderbolt or USB.
  4. Works with Thunderbolt 4, Thunderbolt 3, USB4, and USB host computers and mobile devices. Thunderbolt/Thunderbolt 2 Mac models are supported via USB-A host connection. Thunderbolt/Thunderbolt 2 host connection is not supported.
    • With a USB host (such as a USB-C equipped MacBook, iPad, Chromebook, Android device, or PC), this device works as a USB hub. Bandwidth is reduced to USB speeds, Thunderbolt devices are not supported, and additional functionality will vary depending upon the host port's capabilities.
    • With a USB-C host, displays and power delivery support will depend upon the host port's capabilities.
    • With a USB-A host, displays and power delivery are not supported. Requires a USB-C to USB-A adapter cable (available separately).
    • A USB host connection is required for Mac systems running macOS 10.14 or 10.15.
  5. NVMe SSD usage requires a Thunderbolt (USB-C) host connection with a compatible system running macOS 11.x or later. USB host connectivity provides SATA drive use only, and limits additional miniStack STX ports to USB connectivity only.
  6. Storage examples for illustrative purposes only. Individual results may be different based on variety of factors including specific file size and format, settings, features, software and other factors. Storage estimates based on the following:
    • 12-megapixel camera with 4MB image sizes
    • 4-minute average 4MB MP3 songs
    • 4-minute average uncompressed Apple Lossless (ALAC) songs
    • 1080p HD videos with 5GB average file size
    • GoPro 4K footage at 60FPS 24GB/hr
    • 250KB average MS Office document file size
  7. 3 Year OWC Limited Warranty for Hard Drive and Solid-State Drive solutions. 1 Year OWC Limited Warranty for Enclosure only.