QNAP QDA-A2AR 3.5" to Dual 2.5" SATA Drive Bay Adapter

Overview

The QDA-A2AR is a passive drive bay adapter that lets you install two 2.5-inch SATA 6Gbps drives — HDDs or SSDs — into a single 3.5-inch SATA drive bay. No software driver is required, so there is no compatibility risk with the host system's OS or firmware. The practical payoff: NAS enclosures or servers with open 3.5-inch bays can absorb 2.5-inch SATA media without a wasted slot or an empty bay consuming airflow capacity. Each drive slot supports SATA 6Gbps throughput, so neither drive is bottlenecked by the adapter. Drives must be 9.5 mm or thinner — standard 2.5-inch laptop HDDs and virtually all 2.5-inch SSDs fall within that envelope, but check thickness on older 12.5 mm high-capacity 2.5-inch HDDs before purchasing.

Compatibility

The QDA-A2AR fits any 3.5-inch SATA 6Gbps drive bay. It is designed for use with QNAP NAS enclosures that accept standard 3.5-inch SATA trays, including QNAP tower and rackmount NAS families with tool-less or screw-in 3.5-inch drive trays. Compatible drives: 2.5-inch SATA 6Gbps HDDs and SSDs up to 9.5 mm in height. Two drives install simultaneously into the single adapter, each operating independently on its own SATA channel as presented by the host — the host sees two discrete NAS storage devices, not a RAID set managed by the adapter.

Installation Notes

Drive height is the critical constraint: maximum 9.5 mm per drive. Standard 2.5-inch SSDs (7 mm) and most 2.5-inch HDDs (7–9.5 mm) are compatible; thicker 12.5 mm drives will not seat correctly. No driver installation is needed on any supported operating system. Slide the assembled adapter into the host's 3.5-inch drive tray exactly as you would a standard 3.5-inch HDD — locking and connection mechanics are identical to a native 3.5-inch drive.

What's in the Box

1x QDA-A2AR dual 2.5" to 3.5" SATA adapter