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Black aluminum M.2 SATA enclosure with attached USB-C cable

STARTECH

STARTECH SM21BMU31CI3 M.2 SATA drive enclosure USB 3.1 Gen 2 Type-C

SKU CH-A63H-RGPPH MPN SM21BMU31CI3

Aluminium enclosure turns a SATA M.2 SSD into USB-C external storage with an integrated cable

  • SizeM.2
  • Drive interfaceM.2 NGFF B-Key
  • External connectionUSB 3.1 Gen 2 Type-C
  • Bay count1
  • Power detailsUSB-Powered
  • Supported operating systemsOS independent; No software or drivers required
  • Turn your M.2 SATA drive into portable USB-C storage with no drivers needed
  • USB 3.1 Gen 2 delivers up to 10 Gbps host bandwidth for fast file transfers
  • Solid aluminum housing with ventilation keeps the drive cool during sustained workloads
  • Integrated USB-C cable and included screws make setup quick and tool-free
  • Supports 2242, 2260 and 2280 M.2 SATA drives for flexible upgrade options

M.2 SATA to USB-C Enclosure

The SM21BMU31CI3 converts a M.2 NGFF B-Key SATA SSD into portable external storage for USB-C laptops, tablets or desktops. It accepts 2242, 2260 and 2280 drives and draws power from the host port. The integrated USB-C cable and aluminium housing keep the unit compact at 11x5x1.4 cm.

USB 3.1 Gen 2 host link and SATA III drive limit

The enclosure uses a JMicron JMS580 bridge to connect the SATA III 6 Gbps drive to a USB 3.1 Gen 2 Type-C host interface rated at 10 Gbps. UASP and TRIM are supported on compatible operating systems. The practical throughput will not exceed the SATA III ceiling.

Check drive keying and OS TRIM support before

This enclosure only works with M.2 SATA drives that have a B-Key or B+M-Key notch; it will not accept M.2 NVMe or PCIe SSDs. Windows 7 and earlier do not enable TRIM over USB-to-SATA bridges. No driver or software installation is required on supported systems.

How it compares

Measured against everything we stock in External Drive Enclosures, at today’s prices. Recalculated every night.

Price $39.99
Pricier than about 58% of the 821 comparable items (median $30.99).

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Specifications

Product
Brand nameStarTech.com
Model nameSM21BMU31CI3
Product colorBlack
Product typeEnclosure
Storage
Drive interfaceM.2 NGFF B-Key
Bay count1
Ports & slots
External connectionUSB 3.1 Gen 2 Type-C
Power
Power adapterNo
Power detailsUSB-Powered
Size & build
SizeM.2
Main materialAluminum
Product dimensions0.6 in × 4.3 in × 2 in
Product weight3.4 oz
Shipping weight0.11 kg
Package size168 × 98 × 30 mm
Compatibility
Supported operating systemsOS independent; No software or drivers required
In the box
In the box1 x M.2 SATA Enclosure with Integrated USB-C Cable
1 x Screwdriver
4 x Assembly Screws
1 x Set of Drive-Mounting Hardware
1 x Quick-Start Guide

Questions about this item

Which M.2 SATA drive lengths does this enclosure accept?

It fits 2242, 2260 and 2280 modules, all using the B-key SATA interface.

What real-world speed will I see from a SATA SSD inside this USB 3.1 Gen 2 Type-C enclosure?

The drive is limited by its SATA III 6 Gbps link, so the USB 10 Gbps connection will not increase throughput beyond the SATA ceiling.

Does the USB 3.1 Gen 2 Type-C port deliver the full 10 Gbps to the drive?

The host link runs at 10 Gbps with UASP, but the internal SATA III interface tops out at 6 Gbps, capping actual drive speed.

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