Compatibility / QNAP / TS-673A

Compatible Hard Drives for the QNAP TS-673A

QNAP's list for the TS-673A read 20 August 2026. Prices last refreshed 2026-08-20.

What QNAP's list actually commits to

QNAP is unusually direct about this, and the wording is worth reading closely because it settles the question most buyers are really asking. On its compatibility page it says:

“QNAP customer service is unable to provide technical support for devices not listed on the QNAP compatibility list.”

That is a statement about the support desk, not about the hardware. Nothing in it says an unlisted drive will fail to work, and in practice it does not - the TS-673A will initialise a drive QNAP has never tested and build a volume on it. What you forfeit is the right to call QNAP about it.

Its recommendation is phrased the same way:

“To ensure optimal compatibility and performance, please use devices included in the compatibility list.”

Please use is not you must use. And the clearest evidence of the posture is that QNAP itself offers a way around its own list, linking one compiled from customer reports: “Click here to check unofficial (reported by users) compatibility list.” A manufacturer that intended its list to be a gate does not publish a door beside it.

Quoted from QNAP's compatibility page, www.qnap.com, read 19 August 2026. We record what the list said on that date; we do not re-read it when you load this page.

In stock now for the TS-673A

Internal SATA hard drives available today, cheapest per terabyte first. Where the exact model appears on QNAP's list for this machine it is marked vendor-listed; where it does not, the row says so rather than leaving the question open.

7 of the 20 drives above match a part number on QNAP's TS-673A list. A drive can be absent because QNAP never tested it rather than because it failed - QNAP's list runs to 676 entries and the market is larger than that. Buy links are affiliate links; prices update every few hours.

The shape of QNAP's list for this machine

676 entries across 4 brands - Seagate 232, WD 216, Toshiba 206, HGST 22. That spread is worth noticing: QNAP tests broadly across the manufacturers who actually make NAS drives rather than steering you toward one.

The families at the top are the NAS and enterprise lines, which is the useful signal in the table. QNAP is not telling you a desktop drive will fail; it is telling you where it spent its testing budget, and it spent it where the drives are designed to run continuously.

How this compares with the other manufacturers

QNAP sits in the middle of a real spectrum, and the middle is a defensible place to be.

At one end, Ubiquiti publishes no list at all, only a specification - 1TB or larger, CMR, 7200RPM - and any drive meeting it qualifies. At the other, Synology will not create a storage pool on an unlisted hard drive on its 2025-and-later Value and J-series machines, and lists no third-party hard drive at all. QNAP tests widely, publishes the result per machine, tells you support depends on it, and blocks nothing.

For a buyer the practical difference is what the list decides. QNAP's decides who answers the phone. Synology's, on those machines, decides who you can buy from.

Is QNAP's list really per-machine? We checked

Every page in this section has said QNAP publishes a genuinely different list for each machine. Until all three six-bay captures existed, the only evidence for that was three different row counts - and three counts of 390, 676 and 437 are equally consistent with one list truncated three ways. With the rows in hand the claim is checkable, so we checked it.

The comparison is on distinct part numbers, not rows, because QNAP publishes one row per firmware revision - a raw row count would record the same drive twice on one machine and once on another and read that difference as disagreement.

Across all three machines QNAP names 685 distinct hard drives, and only 116 of them appear on every list. The weakest pair overlaps by 19.2%. These are three six-bay machines from one manufacturer, so bay count plainly is not what drives the list - product generation is.

The TS-673A carries the longest list of the three, 676 rows, and it is the only one where Seagate leads the brand mix rather than WD. It is an AMD Ryzen machine and the breadth shows: 305 of its part numbers appear on no other list we hold. If you are choosing between these three chassis on drive flexibility alone, this is the one with the widest tested field - though on all three an unlisted drive builds a volume anyway.

For the TS-673A specifically: 288 part numbers shared with the TS-664, and 376 part numbers shared with the TS-653D. If you own more than one QNAP, that is how much of a bulk drive order carries across.

The other captured machines: QNAP TS-664 compatible drives · QNAP TS-653D compatible drives. See the compatibility hub for the full vendor comparison.