Live prices · Sorted by price per TB

Best 20TB Hard Drive Deals Right Now

Compare 20TB Hard Drives on Amazon US by price per TB. Choose new or used, then check the model, seller and price timestamp before buying.

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10 offers by price per TB

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We found 10 recently priced 20TB Hard Drives (new). Prices start at $698.99, with the lowest price per TB currently at $34.95/TB.

#	Product	Capacity	Condition	Price / TB	Price	Region
1	BUFFALO Replacement Spare Hard Drive 20TB NAS-Grade for TeraStation 2/4/8 Bay (OP-HD20.0N) Internal 3.5"HDD Listed warranty: 36 months · verify seller 20TB · New · Amazon US Price checked Oct 27, 2026 12:21 UTC	20 TB	New	$34.95 /TB	$698.99	us	Amazon ↗
2	Toshiba - HDWG82AXZSTB - Toshiba N300 Pro HDWG82AXZSTB 20 TB Hard Drive - 3.5 Internal - SATA (SATA/600) - Conventional 3.5-inchHDD HDWG82AXZSTB specifications → 20TB · New · Amazon US Price checked Oct 27, 2026 13:34 UTC	20 TB	New	$38.35 /TB	$766.99	us	Amazon ↗
3	Toshiba X300 20TB Performance & Gaming 3.5-Inch Internal Hard Drive – CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWR62AXZSTA 3.5"HDD 20TB · New · Amazon US Price checked Oct 27, 2026 13:34 UTC	20 TB	New	$40.00 /TB	$799.99	us	Amazon ↗
4	Seagate Skyhawk AI 20TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 512MB Cache for DVR NVR Security Camera System with in-House Rescue Services (ST20000VE003) 3.5-inchHDD ST20000VE003 specifications → 20TB · New · Amazon US Price checked Oct 27, 2026 13:32 UTC	20 TB	New	$44.00 /TB	$879.99	us	Amazon ↗
5	Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C Check form factorHDD 20TB · New · Amazon US Price checked Oct 27, 2026 12:25 UTC	20 TB	New	$45.52 /TB	$910.40	us	Amazon ↗
6	Seagate Exos X20 ST20000NM000D 20 TB Hard Drive - Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage System, Video Surveillance System Device Supported - 7200rpm - 285 3.5-inchHDD ST20000NM000D specifications → 20TB · New · Amazon US Price checked Oct 27, 2026 13:32 UTC	20 TB	New	$49.72 /TB	$994.43	us	Amazon ↗
7	Western Digital Ultrastar WUH722020CLE6L4 20 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) Method 3.5"HDD 20TB · New · Amazon US Price checked Oct 27, 2026 12:19 UTC	20 TB	New	$49.95 /TB	$999.00	us	Amazon ↗
8	Toshiba 20TB MG10ACA20TE SATA 600GB 20in1 HDD 3.5-inchHDD MG10ACA20TE specifications → 20TB · New · Amazon US Price checked Oct 27, 2026 13:34 UTC	20 TB	New	$54.45 /TB	$1089.00	us	Amazon ↗
9	Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGX 3.5-inchHDD WD201KFGX specifications → 20TB · New · Amazon US Price checked Oct 27, 2026 13:32 UTC	20 TB	New	$60.00 /TB	$1199.99	us	Amazon ↗
10	BUFFALO Replacement Spare Hard Drive 20TB Enterprise-Grade for TeraStation 12-Bay (OP-HD20.0H2U-5Y) Internal 3.5"HDD Listed warranty: 36 months · verify seller 20TB · New · Amazon US Price checked Oct 27, 2026 12:21 UTC	20 TB	New	$66.65 /TB	$1333.00	us	Amazon ↗

See all 10 listings

What to Check Before Buying a 20TB Hard Drive

Recording technology

Check CMR or SMR for the exact model. For a NAS or sustained writes, start with your enclosure's compatibility list and workload requirements.

Warranty provider

A manufacturer's specification describes an eligible new drive. OEM, bulk and renewed offers may have different seller or manufacturer coverage.

Workload and compatibility

Confirm SATA versus SAS, drive dimensions, supported bays and the model-specific workload rating before buying.

Usable capacity

Account for formatting, redundancy and free space. A mirror uses two drives to provide approximately one drive's capacity; it does not replace an independent backup.

Frequently Asked Questions

Is 20TB enough for my NAS?

Start with your current data, expected growth and array layout. Nominal 20TB capacity is measured in decimal units; filesystem overhead and redundancy reduce usable space. Keep a separate backup of important data.

Should I buy a new or used 20TB hard drive?

Compare the actual price saving with the seller's return period, warranty and available test history. A used drive's age or enterprise branding does not prove its health. New and used drives both need independent backups.

What is a good price per TB for a 20TB hard drive?

Use the lowest recently checked offer in the table as a starting point among the listings we track. Compare the same condition and interface, then confirm the seller and final price on Amazon. We do not cover every market offer.

Sources and further reading

Toshiba N300 Pro model specifications

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