The best 20 TB NAS drive in Canada
By Amara Okonkwo · Data checked by Owen Nakamura · Updated · Prices checked At 20 TB, the picks are enterprise Exos and Ultrastar for the lowest CA$/TB, or IronWolf Pro and WD Red Pro for a quieter NAS drive: all CMR, 7200 rpm, 5-year warranty. 20 TB suits fewer-bay builds chasing maximum capacity: four give about 54.6 TiB usable in SHR or RAID 5, and RAID 6 is strongly advised at this size. The table ranks what is in stock by CA$/TB.
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20 TB: maximum capacity per bay
20 TB is for buyers who want the most storage from the fewest bays: a two-bay mirror gives 20 TB usable, a four-bay SHR/RAID 5 about 54.6 TiB. Fewer, larger drives also draw less power for the same capacity, which lowers the running cost (see the power-cost guide). At this size the drives are almost all enterprise or Pro lines; there is no standard 5400-class option.
RAID 6 is the default at 20 TB
The rebuild argument is strongest here. Reading a full set of 20 TB drives to rebuild after a failure takes well over a day under load, so a RAID 5 array spends a long window unprotected. At 20 TB, plan for RAID 6 or SHR-2 from the start: four 20 TB drives give about 54.6 TiB in RAID 5 or 36.4 TiB in RAID 6. Confirm your layout in the RAID calculator before buying.
20 TB NAS drives on Amazon.ca, by CA$/TB
20 TB CMR NAS drives in stock on Amazon.ca, ranked by price per terabyte in CAD.
| Model | Capacity | Recording | Price | CA$/raw TB | |
|---|---|---|---|---|---|
 Seagate Exos X24 ST20000NM002H 20TBNewbest price per TB CMR recording, SATA enterprise drive Amazon.ca · sold by THEKEYKEY · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,165Buy on Amazon | 20 TB | CMR ✓ | CA$1,165 | CA$58.25/TB | Buy on Amazon |
 Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD202KFGXNew CMR recording, SATA NAS drive rated for 24/7 use Amazon.ca · sold by Amazon.ca · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,201Buy on Amazon | 20 TB | CMR ✓ | CA$1,201 | CA$60.03/TB | Buy on Amazon |
 Western Digital 20TB WD Ultrastar DH HC560 7200RPM 512MB Ent,New CMR recording, SATA enterprise drive Amazon.ca · sold by Canada Direct - Often Ships Same Day! · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,815Buy on Amazon | 20 TB | CMR ✓ | CA$1,815 | CA$90.75/TB | Buy on Amazon |
 Western Digital Ultrastar WUH722020CLE6L4 20 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) MethodNew CMR recording, SATA enterprise drive Amazon.ca · sold by Rarewaves-CA · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,871Buy on Amazon | 20 TB | CMR ✓ | CA$1,871 | CA$93.54/TB | Buy on Amazon |
Show renewed and used offers (6)
Kept out of the table above: a renewed or used drive has a different warranty and an unknown history, so its price per TB is not comparable with a new drive’s. Each row shows its condition.
| Model | Capacity | Recording | Price | CA$/raw TB | |
|---|---|---|---|---|---|
 Western Digital Ultrastar DC HC560 WUH722020BLE601 0F38781 20TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed)Renewed CMR recording, SATA enterprise drive Amazon.ca · sold by ServerPartDeals · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,108Buy on Amazon | 20 TB | CMR ✓ | CA$1,108 | CA$55.42/TB | Buy on Amazon |
 Western Digital Ultrastar DC HC560 WUH722020BLE6L1 0F38784 20TB 7200 RPM SATA 6Gb/s 512e 512MB 3.5in Enterprise Hard Drive (Renewed)Renewed CMR recording, SATA enterprise drive Amazon.ca · sold by ServerPartDeals · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,108Buy on Amazon | 20 TB | CMR ✓ | CA$1,108 | CA$55.42/TB | Buy on Amazon |
 Seagate Exos X20 ST20000NM002D 512E/4KN SAS 12Gb/s 20TB 7200RPM 256MB Enterprise Hard Drive (Renewed)RenewedSAS CMR recording, SAS enterprise drive Amazon.ca · sold by ServerPartDeals · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,285Buy on Amazon | 20 TB | CMR ✓ | CA$1,285 | CA$64.27/TB | Buy on Amazon |
 Seagate Exos X20 ST20000NM003D 20TB 7200 RPM SAS 12Gb/s 512e 256MB SED 3.5in Enterprise Hard Drive (Renewed)RenewedSAS CMR recording, SAS enterprise drive Amazon.ca · sold by ServerPartDeals · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,334Buy on Amazon | 20 TB | CMR ✓ | CA$1,334 | CA$66.68/TB | Buy on Amazon |
 Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive (Renewed)Renewed CMR recording, SATA enterprise drive Amazon.ca · sold by Redefine IT · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,372Buy on Amazon | 20 TB | CMR ✓ | CA$1,372 | CA$68.58/TB | Buy on Amazon |
 Seagate Exos X20 20TB Enterprise HDD - CMR 3.5 Inch Hyperscale SATA 6Gb/s, 7200 RPM, 512e and 4Kn FastFormat, Low Latency with Enhanced Caching - ST20000NM007D (Renewed)Renewed CMR recording, SATA enterprise drive Amazon.ca · sold by Redefine IT · one bare internal drive; shipping and taxes not included · checked Oct 15, 2026CA$1,372Buy on Amazon | 20 TB | CMR ✓ | CA$1,372 | CA$68.58/TB | Buy on Amazon |
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Frequently asked questions
What is the best 20 TB NAS drive in Canada?
For lowest CA$/TB, a 20 TB Seagate Exos or WD Ultrastar; for a quieter NAS-tuned drive, IronWolf Pro or WD Red Pro. All are CMR, 7200 rpm, 5-year warranty. The live table ranks what is in stock.
Do I need RAID 6 with 20 TB drives?
It is strongly advised. Rebuilding a 20 TB array after a failure takes well over a day, leaving a RAID 5 array exposed the whole time. RAID 6 or SHR-2 survives two failures and is the sensible default at this capacity.
How much usable space do four 20 TB drives give?
About 54.6 TiB in SHR or RAID 5 (60 TB in drive-maker terms), surviving one failure; about 36.4 TiB in RAID 6 or SHR-2, surviving two. The RAID calculator shows other layouts.
Amara Okonkwo works out what a NAS costs to run over a year on provincial Canadian hydro rates, and ranks drive prices by Canadian dollars per terabyte, using the site's Amazon.ca price sync.
Data checked by Owen Nakamura, Technical editor (data checking)