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Product & specifications					Amazon offer
Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZ 3.5"HDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	Used / renewed	$27.78 /TB	$499.99	Amazon ↗
Western Digital DC HC550 18TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD - WUH721818ALE604 (0F38453) (Renewed) 3.5-inchHDD Listed warranty: 3 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	Used / renewed	$29.39 /TB	$529.00	Amazon ↗
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed) Internal 3.5"HDD Listed warranty: 3 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:12 UTC	18 TB 18000 GB	Used / renewed	$30.00 /TB	$540.00	Amazon ↗
MDD MAXDIGITALDATA MDD (MDD18TS25672NAS) 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive (Renewed) Internal 3.5"HDD Listed warranty: 60 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:12 UTC	18 TB 18000 GB	Used / renewed	$30.00 /TB	$539.99	Amazon ↗
Seagate Exos ST18000NM002C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed) 3.5"HDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:09 UTC	18 TB 18000 GB	Used / renewed	$30.00 /TB	$539.99	Amazon ↗
Seagate Exos ST18000NM003C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed) 3.5"HDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	Used / renewed	$30.00 /TB	$539.99	Amazon ↗
MDD (MDD18TS25672CCTV) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed) Internal 3.5"HDD Listed warranty: 36 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:12 UTC	18 TB 18000 GB	Used / renewed	$30.55 /TB	$549.99	Amazon ↗
Seagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed) Internal 3.5"HDD Listed warranty: 3 months · verify seller ST18000NM000J specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:12 UTC	18 TB 18000 GB	Used / renewed	$30.55 /TB	$549.99	Amazon ↗
Western Digital Ultrastar DC HC550 WUH721818ALE601 0F38452 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed) Check form factorHDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:09 UTC	18 TB 18000 GB	Used / renewed	$31.06 /TB	$559.00	Amazon ↗
Western Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed) 3.5-inchHDD Listed warranty: 3 months · verify seller WUH721818ALE6L4 specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	Used / renewed	$31.61 /TB	$569.00	Amazon ↗
WD WD181KRYZ Gold 18 TB Hard Drive - 3.5-inch Internal - SATA (SATA/600) - Server, Storage System Device Supported - 7200rpm (Renewed) 3.5-inchHDD WD181KRYZ specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	Used / renewed	$33.28 /TB	$599.00	Amazon ↗
Western Digital 18TB WD Gold Enterprise Class Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181KRYZ (Renewed) Internal 3.5"HDD Listed warranty: 3 months · verify seller WD181KRYZ specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 12:26 UTC	18 TB 18000 GB	Used / renewed	$33.28 /TB	$599.00	Amazon ↗
Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5 Internal - SATA Check form factorHDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	Used / renewed	$33.33 /TB	$599.99	Amazon ↗
Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5" Internal - SATA 3.5"HDD 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:09 UTC	18 TB 18000 GB	Used / renewed	$33.33 /TB	$599.99	Amazon ↗
Seagate Exos X20 18TB 7200 RPM 512e SATA 6Gb/s 3.5" Enterprise Hard Drive - ST18000NM003D (Renewed) Internal 3.5"HDD Listed warranty: 24 months · verify seller ST18000NM003D specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:12 UTC	18 TB 18000 GB	Used / renewed	$33.33 /TB	$599.99	Amazon ↗
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) 3.5-inchHDD Listed warranty: 24 months · verify seller WD181KFGX specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	Used / renewed	$34.39 /TB	$619.00	Amazon ↗
Toshiba MG09 Series MG09ACA18TE - Hard Drive - 18 TB - SATA 6Gb/s 3.5-inchHDD MG09ACA18TE specifications → 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 13:35 UTC	18 TB 18000 GB	Used / renewed	$35.28 /TB	$635.00	Amazon ↗
Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 512MB Cache, 3.5" - WD180PURZ (Renewed) 3.5"HDD Listed warranty: 24 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 13:34 UTC	18 TB 18000 GB	Used / renewed	$36.61 /TB	$659.00	Amazon ↗
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J 3.5-inchHDD 18TB · New · Amazon US Price checked Oct 27, 2026 13:33 UTC	18 TB 18000 GB	New	$38.56 /TB	$694.00	Amazon ↗
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) Check form factorHDD Listed warranty: 3 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 12:26 UTC	18 TB 18000 GB	Used / renewed	$38.78 /TB	$698.00	Amazon ↗
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 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	Used / renewed	$38.89 /TB	$699.99	Amazon ↗
Seagate ST18000NM003D 18TB Exos X20 SATA Hard Drive, 3.5" HDD, SATA 6Gb/s, 7200rpm, 256MB Cache, 512E, 4.16ms, NCQ 3.5-inchHDD ST18000NM003D specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 13:34 UTC	18 TB 18000 GB	New	$43.58 /TB	$784.45	Amazon ↗
Toshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600] 3.5-inchHDD MG09ACA18TE specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 13:35 UTC	18 TB 18000 GB	New	$44.94 /TB	$809.00	Amazon ↗
Seagate ST18000VN000 18TB 7200RPM 256MB NAS Hard Drive 3.5-inchHDD ST18000VN000 specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	New	$46.36 /TB	$834.45	Amazon ↗
Seagate Exos X18 ST18000NM001J 18 TB Hard Drive - Internal - SATA (SATA/600) 3.5-inchHDD ST18000NM001J specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 13:33 UTC	18 TB 18000 GB	New	$47.75 /TB	$859.45	Amazon ↗
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 18TB · New · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	New	$48.58 /TB	$874.45	Amazon ↗
WD Red Pro 18TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 512MB Cache 3.5"HDD 18TB · New · Amazon US Price checked Oct 27, 2026 18:08 UTC	18 TB 18000 GB	New	$49.69 /TB	$894.45	Amazon ↗
Toshiba MG09 Series MG09ACA18TE - Hard Drive - 18 TB - SATA 6Gb/s 3.5-inchHDD MG09ACA18TE specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 13:35 UTC	18 TB 18000 GB	New	$57.78 /TB	$1,040.00	Amazon ↗
Western Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZ 3.5"HDD 18TB · New · Amazon US Price checked Oct 27, 2026 18:07 UTC	18 TB 18000 GB	New	$60.50 /TB	$1,089.00	Amazon ↗
Toshiba - MG11ACA18TE - Toshiba MG11 MG11ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA (SATA/600) - Conventional 3.5-inchHDD MG11ACA18TE specifications → 18TB · New · Amazon US Price checked Oct 27, 2026 13:36 UTC	18 TB 18000 GB	New	$75.70 /TB	$1,362.54	Amazon ↗
Seagate Exos X20 18TB SATA 6Gb/s 7200RPM 3.5" 5-Pack Enterprise HDD - ST18000NM003D (Renewed) Internal 3.5"HDD Listed warranty: 3 months · verify seller 18TB · Used / renewed · Amazon US Price checked Oct 27, 2026 12:24 UTC	3.6 TB x5 = 18 TB total	Used / renewed	$144.44 /TB	$2,599.99	Amazon ↗

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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, with timestamps on individual offers. Amazon confirms the final price, seller and availability at checkout.

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NAS Storage

Drives built for 24/7 NAS & RAID workloads

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Price per TB

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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.

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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.

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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.

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Surveillance

Surveillance HDDs: DVR/NVR Compatibility and Recording Capacity

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

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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.

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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

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As an Amazon Associate, Disk Scout earns from qualifying purchases when you click through and buy on Amazon. Comparison tables default to price per TB and can be filtered or sorted. There is no paid placement.

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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.

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US price refresh jobs run every six hours. Check the timestamp on each offer; not every listing updates in every run. See our Methodology page for details on how we collect and calculate prices.

What does "price per TB" mean?

Price divided by the listed decimal capacity (1TB = 1,000GB), before formatting and RAID overhead. Compare compatible drives in the same condition. Full explanation in our price-per-TB guide.

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