QNAP TS-464: capacity calculator
By Devin Chua · Data checked by Owen Nakamura · Updated In the QNAP TS-464 with 4 × 8 TB in RAID 5 you keep 21.83 TiB usable (24 TB in drive-maker terms), surviving 1 drive failing. The calculator below is preset to the 4 bays and the RAID types QTS 5.2 or QuTS hero (ZFS) actually offers on this model (there is no SHR equivalent here), with the cost to fill in Canadian dollars from live Amazon.ca prices.
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Preset for the TS-464: 4 bays, and only the RAID types this model actually supports.
RAID 1 (Mirroring)
That is 8 TB the way drive makers label capacity. Your NAS shows you the smaller number because it counts in powers of two.
Drives: from CA$2,016 for 4 × 8 TB (CA$63.01/TB overall)
What to know about the TS-464
The most interesting QNAP for self-deciders: the PCIe slot makes 10GbE an upgrade, and with QuTS hero the same box runs ZFS instead of ext4. If you choose QuTS hero, the RAID-Z calculator applies, not the RAID calculator. QNAP has no SHR equivalent: mixed drive sizes waste real capacity here.
The TS-464 at a glance
| Bays | 4 × 3.5-inch SATA and 2.5-inch SATA SSD |
|---|---|
| Processor | Intel Celeron N5095 (4 cores) |
| Memory | 8 GB stock, DDR4 SO-DIMM, no ECC (2 slots) 16 GB official. 32 GB runs per forum reports but is not endorsed by QNAP. |
| M.2 NVMe | 2 slots 2 × M.2 2280 NVMe (PCIe 3.0 x1), freely populated |
| Network | 2 × 2.5GbE, expandable to 5GbE or 10GbE via the PCIe slot |
| RAID types | Single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 |
| Third-party drives | unrestricted Open. QNAP locks no drives; the compatibility list is guidance. QNAP only warns that unlisted drives may affect stability. |
No SHR: mixed drive sizes cost the TS-464 capacity
QTS 5.2 or QuTS hero (ZFS) has no flexible RAID like Synology's SHR. Put one 16 TB drive with three 8 TB drives in the TS-464 and it counts 8 TB per drive — eight terabytes sit idle. So buy matched drives for the TS-464, or work the loss out in the calculator above before you commit to this model; the "unused" figure shows exactly how much you would lose.
RAID 5 or RAID 6 across the TS-464's 4 bays?
With 4 bays the TS-464 gives you the choice. RAID 5 (or SHR) leaves 3 of 4 drives as usable capacity and survives one failure; RAID 6 spends one more drive for two. The rule of thumb: from 16 TB drives up, the rebuild after a failure runs so long — easily a full day — that a second failure in that window stops being theoretical. That is when RAID 6 earns its cost on the TS-464.
Which drives belong in the TS-464?
CMR NAS drives rated for 24/7 use — Seagate IronWolf, WD Red Plus, Toshiba N300 or their Pro variants. Our drive picks for the TS-464 with live prices show which of those currently offers the best capacity per dollar. If you are working back from a target capacity instead, the drive-count calculator works out how many drives you need.
Frequently asked questions
How much storage is left in the TS-464 with 4 × 8 TB?
About 21.83 TiB usable — 24 TB in drive-maker terms — computed in RAID 5, the sensible default for this model. It survives 1 drive failing. The gap from the 32 TB raw goes to parity.
Which RAID types does the TS-464 support?
QTS 5.2 or QuTS hero (ZFS) offers Single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10 on the TS-464. There is no flexible RAID like Synology's SHR here, so mixed drive sizes cost the TS-464 real capacity — every drive counts only as much as the smallest in the array.
Can I put third-party drives in the TS-464?
Open. QNAP locks no drives; the compatibility list is guidance. QNAP only warns that unlisted drives may affect stability.
How much memory does the TS-464 take?
It ships with 8 GB (DDR4 SO-DIMM, no ECC (2 slots)). 16 GB official. 32 GB runs per forum reports but is not endorsed by QNAP. There are 2 slots.
Why does my NAS show less than the calculator says?
Because the maker and the OS count differently. A drive maker calls one trillion bytes a TB; the NAS counts in powers of two and calls that a TiB — about 9 percent less. That is why this calculator leads with the TiB figure: it is the number you will read off the screen.
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)