How much storage fits in the QNAP TS-233?
By Devin Chua · Data checked by Owen Nakamura · Updated The QNAP TS-233 takes 2 drives, but usable is the number that matters: 2 × 8 TB in RAID 1 gives 7.28 TiB, and it survives 1 drive failing. The gap from raw capacity is parity.
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CMR NAS drives for the TS-233, by price per TB
Only families with confirmed CMR recording and a 24/7 rating, in stock on Amazon.ca and sized for the TS-233. SMR drives are deliberately kept out.
What sets the TS-233 apart
The cheapest QNAP and deliberately modest: an ARM processor, 2 GB of soldered RAM, one gigabit port. The network caps you at about 110 MB/s here, so a faster drive buys no more speed. Buy on noise and price per TB, not on data rate.
Who the TS-233 is for
The TS-233 is built on the ARM Cortex-A55 (4 cores, 2.0 GHz) — a file-server processor, not a workstation one. It serves files, backs up your other machines and runs a few lightweight apps, but it does not hardware-transcode Plex and it will not host real virtual machines. With 2 GB of soldered memory, what the TS-233 ships with is what it keeps. Buy it to store and protect data quietly and cheaply, and let CA$/TB and noise choose the drives, because the CPU never will.
How the TS-233's network shapes the drive choice
The TS-233 connects over 1 × 1GbE, and that ceiling decides everything below it. A gigabit link tops out near 110 MB/s, which even a single 5400 rpm NAS drive clears easily. So on the TS-233 a faster, pricier Pro drive returns no extra throughput at all: put an IronWolf or WD Red Plus in every bay and buy on CA$/TB, warranty and noise. The only reason to pay for a Pro drive on the TS-233 is its longer warranty, not speed.
A worked configuration for the TS-233
Seagate IronWolf Pro or WD Red Plus in every bay is the recommendation for the TS-233. At 2 × 8 TB in RAID 1, the TS-233 lands 7.28 TiB usable, gives up 8 TB to parity, and survives 1 drive failing. Step the same 2 bays of the TS-233 up to 16 TB drives and it holds roughly twice that, at the CA$/TB the live table above shows.
One rule holds on every NAS, the TS-233 included: use CMR drives, not SMR. SMR drives rewrite overlapping tracks and collapse during a RAID rebuild, dragging a repair from hours into days.
The QNAP drive policy on the TS-233
unrestrictedOpen. QNAP locks no drives.
The TS-233 at a glance
| Bays | 2 × 3.5-inch SATA and 2.5-inch SATA SSD |
|---|---|
| Processor | ARM Cortex-A55 (4 cores, 2.0 GHz) |
| Memory | 2 GB, 2 GB, soldered Soldered, not upgradeable |
| M.2 NVMe | none No M.2 slots |
| Network | 1 × 1GbE |
| Operating system | QTS 5.2 |
| RAID types | Single, JBOD, RAID 0, RAID 1 |
Keep calculating
To see how much capacity is left after parity, the TS-233 capacity calculator is preset to its 2 bays and RAID types. For the TS-233, the wider basics of choosing a drive are in the buying guides, where we also explain why CMR rather than SMR is mandatory in any RAID array.
Frequently asked questions
What is the maximum storage in the TS-233?
2 drives. QNAP publishes no raw-capacity ceiling for the TS-233; the compatibility list governs.
How much of the TS-233 is actually usable?
In the TS-233, 2 × 8 TB in RAID 1 yields about 7.28 TiB — that is 8 TB in drive-maker terms, with 8 TB to parity. It shows less than the label because it counts in powers of two.
Can I fit larger drives in the TS-233 later?
Yes, but on the TS-233 classic RAID sizes to the smallest drive, so the extra space arrives only once every drive is replaced. There is no flexible RAID like SHR on this model.
Can I put third-party drives in the TS-233?
Yes. QNAP locks no drive brand on the TS-233 — its compatibility list is guidance, not a gate — so any CMR NAS drive works.
Devin Chua works out which drives, RAM and NVMe cache fit which NAS model at nasdrives.ca, and what the RAID choice means for usable capacity, checked against what is in stock on Amazon.ca.
Data checked by Owen Nakamura, Technical editor (data checking)