Storage Comparison

Find your next drive. Know what you’re buying.

Compare current US Amazon offers by price, capacity and condition. Browse manufacturer specifications separately in the catalog.

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Live Listings

Product	Form Factor	Technology	Capacity	Condition	$/TB	Price	Warranty
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J	3.5-inch	HDD	18 TB 18000 GB	Used	$26.67 /TB	$479.99 as of Sep 12, 2026 11:43 UTC	—	View
MDD (MDD18TS25672CCTV) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)	Internal 3.5"	HDD	18 TB 18000 GB	Used	$27.22 /TB	$489.99 as of Sep 12, 2026 10:58 UTC	3 yrs	View
MDD MAXDIGITALDATA MDD (MDD18TS25672NAS) 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive (Renewed)	Internal 3.5"	HDD	18 TB 18000 GB	Used	$27.22 /TB	$489.99 as of Sep 12, 2026 10:58 UTC	5 yrs	View
Western Digital WD Ultrastar 20TB Internal Hard Drive WD200EDGZ 3.5 Inch HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed)	3.5"	HDD	20 TB 20000 GB	Used	$27.50 /TB	$549.99 as of Sep 12, 2026 04:48 UTC	5 yrs	View
Western Digital DC HC550 18TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD - WUH721818ALE604 (0F38453) (Renewed)	3.5-inch	HDD	18 TB 18000 GB	Used	$29.39 /TB	$529.00 as of Sep 12, 2026 04:47 UTC	3 mo	View
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed)	Internal 3.5"	HDD	18 TB 18000 GB	Used	$30.00 /TB	$540.00 as of Sep 12, 2026 10:58 UTC	3 mo	View
Seagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed) ST18000NM000J specifications →	Internal 3.5"	HDD	18 TB 18000 GB	Used	$30.00 /TB	$539.99 as of Sep 12, 2026 10:58 UTC	3 mo	View
Western Digital 18TB WD Red Pro NAS WD181KFGX 7200 RPM SATA 6 Gb/s CMR 256 MB Cache 3.5" Internal Hard Drive HDD (Renewed) WD181KFGX specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$30.22 /TB	$544.00 as of Sep 12, 2026 10:56 UTC	2 yrs	View
Seagate Exos X20 18TB 7200 RPM 512e SATA 6Gb/s 3.5" Enterprise Hard Drive - ST18000NM003D (Renewed) ST18000NM003D specifications →	Internal 3.5"	HDD	18 TB 18000 GB	Used	$31.67 /TB	$569.99 as of Sep 12, 2026 10:58 UTC	2 yrs	View
Toshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600] MG09ACA18TE specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$33.28 /TB	$599.00 as of Sep 12, 2026 11:46 UTC	—	View
Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5 Internal - SATA	—	HDD	18 TB 18000 GB	Used	$33.33 /TB	$599.99 as of Sep 12, 2026 04:47 UTC	—	View
Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5" Internal - SATA	3.5"	HDD	18 TB 18000 GB	Used	$33.33 /TB	$599.99 as of Sep 12, 2026 04:47 UTC	—	View
Seagate Exos X20 ST20000NM007D 20TB 7.2K RPM SATA 6Gb/s 3.5in Hard Drive ST20000NM007D specifications →	3.5-inch	HDD	20 TB 20000 GB	Used	$33.65 /TB	$673.00 as of Sep 12, 2026 11:43 UTC	—	View
Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 512MB Cache, 3.5" - WD180PURZ (Renewed)	3.5"	HDD	18 TB 18000 GB	Used	$34.39 /TB	$619.00 as of Sep 12, 2026 11:45 UTC	2 yrs	View
BUFFALO Replacement Spare Hard Drive 20TB NAS-Grade for TeraStation 2/4/8 Bay (OP-HD20.0N)	Internal 3.5"	HDD	20 TB 20000 GB	New	$34.95 /TB	$698.99 as of Sep 12, 2026 10:58 UTC	3 yrs	View
Toshiba MG09 Series MG09ACA18TE - Hard Drive - 18 TB - SATA 6Gb/s MG09ACA18TE specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$35.28 /TB	$635.00 as of Sep 12, 2026 11:45 UTC	—	View
Seagate ST18000NM003D 18TB Exos X20 SATA Hard Drive, 3.5" HDD, SATA 6Gb/s, 7200rpm, 256MB Cache, 512E, 4.16ms, NCQ ST18000NM003D specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$36.00 /TB	$648.00 as of Sep 12, 2026 11:45 UTC	—	View
Toshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600] MG09ACA18TE specifications →	3.5-inch	HDD	18 TB 18000 GB	New	$36.61 /TB	$659.00 as of Sep 12, 2026 11:46 UTC	—	View
Western Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed) WUH721818ALE6L4 specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$36.72 /TB	$661.00 as of Sep 12, 2026 04:47 UTC	3 mo	View
Seagate ST18000NM003D 18TB Exos X20 SATA Hard Drive, 3.5" HDD, SATA 6Gb/s, 7200rpm, 256MB Cache, 512E, 4.16ms, NCQ ST18000NM003D specifications →	3.5-inch	HDD	18 TB 18000 GB	New	$37.92 /TB	$682.58 as of Sep 12, 2026 11:45 UTC	—	View
WESTERN DI - WD Red PRO Nas Hard Drive WD181KFGX - HD - 6176921 WD181KFGX specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$38.72 /TB	$697.00 as of Sep 12, 2026 10:56 UTC	—	View
Seagate Exos Mach.2 18TB Enterprise Hard Drive HDD SATA 6Gb/s 256MB Cache 7200 RPM 512e CMR Helium Sealed 3.5in Hard Drive ST18000NM0092 (Renewed)	Internal 3.5"	HDD	18 TB 18000 GB	Used	$38.78 /TB	$698.00 as of Sep 12, 2026 10:58 UTC	3 mo	View
Seagate (Renewed) Exos X22 20TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD (ST20000NM004E) ST20000NM004E specifications →	3.5-inch	HDD	20 TB 20000 GB	Used	$39.90 /TB	$798.00 as of Sep 12, 2026 10:56 UTC	3 mo	View
Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGX WD201KFGX specifications →	3.5-inch	HDD	20 TB 20000 GB	Used	$40.00 /TB	$799.99 as of Sep 12, 2026 04:49 UTC	—	View
Seagate 20TB Exos Enterprise Hard Drive \| SATA (ST20000NM002H) ST20000NM002H specifications →	3.5-inch	HDD	20 TB 20000 GB	New	$40.00 /TB	$799.99 as of Sep 12, 2026 11:42 UTC	5 yrs	View
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J	3.5-inch	HDD	18 TB 18000 GB	New	$40.33 /TB	$725.91 as of Sep 12, 2026 11:43 UTC	—	View
Western Digital 20TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD202KRYZ	3.5"	HDD	20 TB 20000 GB	Used	$40.45 /TB	$809.00 as of Sep 12, 2026 11:45 UTC	—	View
Western Digital WD Gold Internal Hard Drive, 20 TB, HelioSeal, 3.5 Inches, SATA 7200 rpm, 512 MB Cache, 512 MB, Enterprise, 5 Years Manufacturer's Warranty (WD202KRYZ-AJP Eco Package)	3.5"	HDD	20 TB 20000 GB	Used	$40.45 /TB	$809.00 as of Sep 12, 2026 04:49 UTC	—	View
Seagate Skyhawk AI ST20000VE002 - Hard Drive - 20 TB - SATA 6Gb/s ST20000VE002 specifications →	3.5-inch	HDD	20 TB 20000 GB	Used	$41.70 /TB	$834.00 as of Sep 12, 2026 10:54 UTC	—	View
C-HDD18T-VE 18TB Skyhawk AI Surveillance Hard Drive	Internal 3.5"	HDD	18 TB 18000 GB	New	$43.28 /TB	$779.00 as of Sep 12, 2026 04:48 UTC	1 yr	View
Western Digital 18TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181KRYZ (Renewed) WD181KRYZ specifications →	Internal 3.5"	HDD	18 TB 18000 GB	Used	$44.11 /TB	$794.00 as of Sep 12, 2026 04:48 UTC	3 mo	View
WD WD181KRYZ Gold 18 TB Hard Drive - 3.5-inch Internal - SATA (SATA/600) - Server, Storage System Device Supported - 7200rpm (Renewed) WD181KRYZ specifications →	3.5-inch	HDD	18 TB 18000 GB	Used	$44.28 /TB	$797.00 as of Sep 12, 2026 04:47 UTC	—	View
Toshiba N300 20TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWG62AXZSTA	3.5"	HDD	20 TB 20000 GB	New	$45.00 /TB	$899.95 as of Sep 12, 2026 11:45 UTC	—	View
HD 20TB N300 PRO NAS 3.5" 7200RPM SATA III TOSHIBA HDWG82AXZSTB HDWG82AXZSTB specifications →	3.5-inch	HDD	20 TB 20000 GB	New	$45.62 /TB	$912.35 as of Sep 12, 2026 11:46 UTC	—	View
Seagate IronWolf 18TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage, Rescue Services – Frustration Free Packaging (ST18000VNZ00)	3.5"	HDD	18 TB 18000 GB	New	$46.91 /TB	$844.45 as of Sep 12, 2026 11:45 UTC	—	View
Seagate ST18000VN000 18TB 7200RPM 256MB NAS Hard Drive ST18000VN000 specifications →	3.5-inch	HDD	18 TB 18000 GB	New	$46.91 /TB	$844.45 as of Sep 12, 2026 10:53 UTC	—	View
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 ST20000NM000D specifications →	3.5-inch	HDD	20 TB 20000 GB	New	$47.22 /TB	$944.45 as of Sep 12, 2026 11:46 UTC	—	View
Western Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGX WD201KFGX specifications →	3.5-inch	HDD	20 TB 20000 GB	New	$47.50 /TB	$949.97 as of Sep 12, 2026 04:49 UTC	—	View
Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C	—	HDD	20 TB 20000 GB	Used	$48.65 /TB	$973.00 as of Sep 12, 2026 11:43 UTC	—	View
Seagate Exos X18 ST18000NM001J 18 TB Hard Drive - Internal - SATA (SATA/600) ST18000NM001J specifications →	3.5-inch	HDD	18 TB 18000 GB	New	$49.69 /TB	$894.45 as of Sep 12, 2026 11:45 UTC	—	View
Western Digital Ultrastar WUH722020CLE6L4 20 TB Hard Drive - 3.5" Internal - SATA - Energy-Assisted Magnetic Recording (EAMR) Method	3.5"	HDD	20 TB 20000 GB	New	$49.91 /TB	$998.30 as of Sep 12, 2026 04:47 UTC	—	View
Toshiba 8.9 cm (3.5") 20TB SATA3 Enterprise Capacity 7200 512 Internal	3.5-inch	HDD	20 TB 20000 GB	New	$52.16 /TB	$1,043.15 as of Sep 12, 2026 04:49 UTC	—	View
Toshiba MG09 Series MG09ACA18TE - Hard Drive - 18 TB - SATA 6Gb/s MG09ACA18TE specifications →	3.5-inch	HDD	18 TB 18000 GB	New	$57.78 /TB	$1,040.00 as of Sep 12, 2026 11:45 UTC	—	View
Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C	—	HDD	20 TB 20000 GB	New	$58.40 /TB	$1,167.99 as of Sep 12, 2026 11:43 UTC	—	View
BUFFALO Replacement Spare Hard Drive 20TB Enterprise-Grade for TeraStation 12-Bay (OP-HD20.0H2U-5Y)	Internal 3.5"	HDD	20 TB 20000 GB	New	$66.65 /TB	$1,333.00 as of Sep 12, 2026 10:58 UTC	3 yrs	View
TOSHIBA MG09 3.5 18000 GB Serial ATA III MG09, 3.5", 18000 GB, W126430663 (III MG09, 3.5, 18000 GB, 7200 RPM)	3.5-inch	HDD	18 TB 18000 GB	New	$101.33 /TB	$1,824.00 as of Sep 12, 2026 04:47 UTC	—	View
Seagate Exos X20 18TB SATA 6Gb/s 7200RPM 3.5" 5-Pack Enterprise HDD - ST18000NM003D (Renewed)	Internal 3.5"	HDD	3.6 TB x5 = 18 TB total	Used	$144.44 /TB	$2,599.99 as of Sep 12, 2026 11:02 UTC	3 mo	View

Showing 47 of 47 results

What We Track

Disk Scout tracks internal & external hard drives, SATA/NVMe SSDs, RAM, memory cards, optical media, and LTO tape — pulled directly from Amazon's live listings and refreshed automatically throughout the day, so the table above reflects real, current prices rather than a stale snapshot.

Explore by Category

NAS Storage

Drives built for 24/7 NAS & RAID workloads

NVMe & SSD

High-performance drives for gaming & workstations

Price per TB

How to read the one number that matters most

Used & Enterprise

Refurbished datacenter drives at a fraction of new

Guides & Buying Advice

All guides

NAS comparison

IronWolf vs IronWolf Pro: When Is Pro Worth It?

Compare exact 4TB and 8TB models, workload ratings, warranty and the cost of upgrading the whole array.

Read guide

NAS comparison

WD Red Plus vs Red Pro: Choose for Your NAS

Compare the operating limits and offer terms that can justify the Pro premium.

Read guide

NAS buying guide

NAS Drive Noise and Power: What to Check Before Buying

Compare exact-model power figures, noise evidence and the annual electricity cost of a multi-drive array.

Read guide

Surveillance

Surveillance HDDs: DVR/NVR Compatibility and Recording Capacity

Choose a CCTV drive by exact model, camera bitrate, recording days, workload and enclosure compatibility.

Read guide

Buying comparison

WD Red Plus vs Seagate IronWolf: Compare the Exact Models

Choosing a home NAS drive? Compare Red Plus and IronWolf by model, RPM, cache, capacity and published NAS limits before checking Amazon offers.

Read guide

Buying comparison

Seagate Exos vs WD Ultrastar: A SATA Buying Comparison

Compare Exos X18 and Ultrastar DC HC550 models for bulk storage. Check SATA versus SAS, sector format, model suffixes and renewed-offer terms.

Read guide

Frequently Asked Questions

Is Disk Scout affiliated with Amazon?

No. Disk Scout is an independent, third-party price tracker. We are not owned by, operated by, or affiliated with Amazon.com, Inc. or its affiliates.

How does Disk Scout make money?

As an Amazon Associate, Disk Scout earns from qualifying purchases when you click through and buy on Amazon. This never affects rankings — every table is sorted purely by price per TB, with no paid placement.

Why do prices differ between regions?

Amazon sets independent pricing, tax, and currency for each marketplace, so the same drive can cost meaningfully different amounts by region. We show each region separately rather than converting to one currency, since live exchange rates would make the comparison misleading.

How often are prices updated?

Every 4 hours, automatically. See our Methodology page for details on how we collect and calculate prices.

What does "price per TB" mean?

Total price divided by usable capacity, so drives of very different sizes can be compared fairly. Full explanation in our price-per-TB guide.

Can I save listings to compare later?

Yes — click the heart icon on any listing to save it locally in your browser (no account needed), then filter to "Saved" to compare your shortlist.