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Green circuit board with M.2 2242 edge connector and two SATA ports

SMUGDESK

SMUGDESK SI-ADA40149 M.2 2242 B+M Key to 2-Port SATA 3.0 Adapter with JMB582 Chip

SKU CH-1V1W-PCCEF

Converts an M.2 2242 slot into two SATA 3.0 ports using a JMB582 chip for 2.5-inch drive expansion

  • M.2 2242 B+M Key fits spare motherboard slots without using a PCIe bracket
  • JMicron JMB582 chip delivers two independent SATA 3.0 ports at 6Gbps each
  • Connect 2.5-inch SSDs, HDDs or optical drives for extra storage capacity
  • AHCI, NCQ and hot-swap support keep NAS and 24-hour workloads stable
  • Works with Windows, Linux and FreeNAS after simple driver installation

M.2 2242 B+M Key SATA Adapter

This compact adapter converts a single M.2 2242 B+M Key slot into two independent SATA 3.0 ports for 2.5-inch SSDs, HDDs or optical drives. It is built for mini ITX motherboards, small form factor PCs and DIY NAS units where PCIe slots are scarce. The JMicron JMB582 controller provides a direct PCIe-to-SATA bridge without occupying a full expansion bracket. Installation is internal and hidden, keeping chassis wiring tidy.

Upgrade from limited onboard SATA ports

The card adds two 6Gbps channels when the motherboard has no free SATA headers or when a PCIe slot cannot be spared. It is worth the jump for builders expanding a NAS array, adding bulk storage to an embedded system or populating a mini PC drive bay. AHCI, NCQ and hot-swap support keep multiple drives responsive under sustained 24-hour workloads such as disk arrays or video recording. The adapter requires a spare M.2 2242 slot wired for PCIe signalling.

Check M.2 slot keying and length

Verify the motherboard offers an M.2 2242 B+M Key socket that exposes PCIe lanes; some M.2 sockets carry only SATA or are keyed for 2280 modules. Ensure the operating system — Windows, Linux or FreeNAS — can load the JMB582 driver for full hot-plug and NCQ operation. Confirm the chassis has physical space and power connectors for the additional 2.5-inch drives. No PCIe bracket or external power adapter is included.

How it compares

Measured against everything we stock in SATA, IDE & M.2 Drive Adapters, at today’s prices. Recalculated every night.

Price $29.99
Pricier than about 65% of the 1,721 comparable items (median $22.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Will this M.2 2242 B+M Key adapter fit in my motherboard M.2 slot?

The adapter uses the M.2 2242 form factor with B+M Key notch, so it inserts directly into any standard motherboard M.2 slot that accepts 2242-length cards.

What driver step is required before the JMB582 chip will expose both SATA ports?

Install the JMicron JMB582 driver for your operating system — Windows, Linux or FreeNAS — then the two independent SATA 3.0 channels appear without further configuration.

When should I expect to replace the SATA cables attached to this adapter?

Replace the SATA cables if you see intermittent drive detection, reduced 6Gbps link speed or physical connector damage during routine NAS maintenance.

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