HDD Prices per TB
Capacity

20TB Hard Drives: Cheapest by Price per TB

Drives of about 20 TB (roughly 18 to 22 TB on this page) are among the highest-capacity hard drives most buyers can find. They put the most storage in one bay, and the price per TB is often competitive, but the total cost is high and a failure puts a lot of data at risk. This page ranks them by price per TB.

  • 123listings
  • $27/TBcheapest
  • $35/TBmedian
  • 7,200 RPMfastest spin

Best value picks

Cheapest per TB among named brands. Prices as of 2026-10-28; check Amazon for the current price.

  1. 1
    $27.00/TBAvolusion M5 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Lapt...
    20 TB$539.99USB 3.x
    View on Amazon
  2. 2
    $27.11/TBHP/Western Digital Ultrastar DC HC550 WUH721818ALE600 0F38492 18TB 7200 RPM SATA 6...
    18 TB$488.00SATA3.5"
    View on Amazon
  3. 3
    $27.78/TBAvolusion PRO-5Y Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/...
    18 TB$499.99USB 3.x
    View on Amazon

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123 listings
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$/TBPriceCapacityPack FormForm factorInterfaceSpin speedFeatures ConditionBrandProductDeal
27.00$539.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion M5 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Renewed)View deal
27.11$488.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedHPHP/Western Digital Ultrastar DC HC550 WUH721818ALE600 0F38492 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive MB018000GXLAV P37677-001 (Renewed)View deal
27.78$499.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-5Y Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (Renewed)View deal
27.78$499.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-Z Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (Renewed)View deal
27.78$499.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion M5 Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Renewed)View deal
28.89$519.9918 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedMDDMDD 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)View deal
29.39$529.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital DC HC550 18TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD - WUH721818ALE604 (0F38453) (Renewed)View deal
29.50$589.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-Z Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (Renewed)View deal
30.00$539.9918 TB1Internal 3.5"3.5"SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA MDD (MD18TSATA25672NAS) 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal NAS Hard Drive - 5 Years Warranty (Renewed)View deal
30.00$539.9918 TB1Internal 3.5"—SATA7,200 RPMNASRenewedMDDMDD 2018 MDD18TS25672NAS 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive - 5 Years Warranty (Renewed)View deal
30.00$539.9918 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedSeagateSeagate Exos ST18000NM003C 18TB 7200RPM 512e SATA 6Gb/s 512MB Cache 3.5-Inch Enterprise Hard Drive (Renewed)View deal
30.00$539.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-5X Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (Renewed)View deal
30.00$539.9918 TB1Internal 3.5"—SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA MDD (MDD18TS25672NAS) 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive (Renewed)View deal
30.00$539.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (18TB) (Renewed)View deal
30.56$549.9918 TB1Internal 3.5"3.5"SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA MDD 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal NAS Hard Drive (Renewed)View deal
30.56$549.9918 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceRenewedMDDMDD (MDD18TS25672CCTV) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)View deal
30.56$549.9918 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceNewMDDMDD (MDD18TSATA25672DVR) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years WarrantyView deal
30.56$549.9918 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedMDDMDD MAXDIGITALDATA 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)View deal
30.56$549.9918 TB1Internal HDD—SATA—EnterpriseRenewedSeagateSeagate Exos X18 ST18000NM000J 18 TB Hard Drive - Internal - SATA (SATA/600) (Renewed)View deal
30.56$549.9918 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceRenewedMDDMDD MAXDIGITALDATA MDD (MDD18TS25672CCTV) 18TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)View deal
31.06$559.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital Ultrastar DC HC550 WUH721818ALE601 0F38452 18TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed)View deal
31.11$559.9918 TB1Desktop external—USB 3.2 Gen 27,200 RPMRenewedAvolusionAvolusion PRO-H1 18TB 7200RPM USB 3.2 Gen2 (10Gbps) External Hard Drive (for Windows or MacOS Desktop PC/Laptop) (Renewed)View deal
31.36$689.9922 TB1Internal 3.5"—SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA 22TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal NAS Hard Drive - 5 Years Warranty (Renewed)View deal
31.61$569.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital Ultrastar DC HC550 18TB 7200RPM 3.5" SATA Hard Drive WUH721818ALE6L4 (Renewed)View deal
31.77$699.0022 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseNewSeagateSeagate (Recertified) Exos X22 22TB Internal Hard Drive - 3.5 Inch Hyperscale SATA 6Gb/s HDD, 7200 RPM, 2.5M MTBF, 512e and 4Kn FastFormat, Low Latency with Enhanced Caching (ST22000NM001E)View deal
31.82$699.9922 TB1Internal 3.5"3.5"SATA7,200 RPMNASRenewedMDDMDD (MDD22TS25672NAS) 22TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal NAS Hard Drive - 5 Years Warranty (Renewed)View deal
31.82$699.9922 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceRenewedMDDMDD (MDD22TSATA25672DVR) 22TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)View deal
31.82$699.9922 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedMDDMDD MAXDIGITALDATA MDD 22TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Internal 3.5"—SATA7,200 RPMNASRenewedMDDMDD (MD20TS25672NAS) 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal Hard Drive (for NAS, Network Storage) - 5 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Internal 3.5"3.5"—7,200 RPMEnterpriseRenewedMDDMDD MAXDIGITALDATA MDD 20TB 7200 RPM 256MB Cache 3.5-inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (20TB) (Renewed)View deal
32.00$639.9920 TB1Internal 3.5"3.5"SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA MDD (MD20TSATA25672NAS) 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal NAS Hard Drive - 5 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedMDDMDD MDD (MDD20TSATA25672E) 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Enterprise Hard Drive - 5 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceRenewedMDDMDD (MDD20TSATA25672DVR) 20TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)View deal
32.00$639.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-X USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop - (20TB) (Renewed)View deal
32.22$579.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T8 Series 18TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Black) (Renewed)View deal
32.50$649.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMR EnterpriseRenewedSeagateSeagate Exos ST20000NM004C 20TB 7200RPM 512e SATA 6Gb/s 512MB Cache CMR 3.5-Inch Enterprise Hard Drive (Renewed)View deal
32.50$649.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMR EnterpriseRenewedSeagateSeagate Exos ST20000NM003C 20TB 7200RPM 512e SATA 6Gb/s 512MB Cache CMR 3.5-Inch Enterprise Hard Drive (Renewed)View deal
32.50$649.9920 TB1Internal 3.5"3.5"SATA7,200 RPMSurveillanceRenewedMDDMDD (MDD20TSATA25672DVR) 20TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5-Inch Internal Surveillance Hard Drive - 3 Years Warranty (Renewed)View deal
32.50$649.9920 TB1Internal 3.5"—SATA7,200 RPMNASNewMDDMDD MAXDIGITALDATA 20TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5'' Internal Hard Drive (for NAS, Network Storage) - 5 Years WarrantyView deal
32.50$649.9920 TB1Internal 3.5"3.5"SATA7,200 RPMNASRenewedMDDMDD MAXDIGITALDATA (MD20TSATA25672NAS 20TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5inch Internal NAS Hard Drive (Renewed)View deal
32.50$649.9920 TB1Desktop external—USB 3.x—NewSeagateSeagate One Touch 20TB External Hard Drive Desktop HDD - USB-C Compatible with Most Windows and macOS, Rescue Recovery (STNB20000400)View deal
32.73$719.9922 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedSeagateSeagate Exos X22 22TB SATA 6Gb/s 7200RPM 3.5" Enterprise Hard Drive - ST22000NM001E (Renewed)View deal
32.73$719.9922 TB1Desktop external—USB 3.2 Gen 2—NewOtherBX100 22TB USB 3.2 Gen 2 USB-C External Hard Drive for Windows or MacOS Desktop PC/LaptopView deal
32.78$589.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-X USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop - (18TB) (Renewed)View deal
32.78$589.9918 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-X Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (18TB) (Renewed)View deal
32.95$658.9220 TB1Desktop external—USB 3.x—NewSeagateSeagate 20TB Expansion Desktop Hard Drive | MicroB to USB-C (STNP20000400)View deal
33.00$659.9920 TB1Desktop external—USB 3.2 Gen 27,200 RPMRenewedAvolusionAvolusion PRO-H1 20TB 7200RPM USB 3.2 Gen2 (10Gbps) External Hard Drive (for Windows or MacOS Desktop PC/Laptop) (Renewed)View deal
33.00$659.9920 TB1Desktop external—USB 3.2 Gen 2—NewOtherBX100 20TB USB 3.2 Gen 2 USB-C External Hard Drive for Windows or MacOS Desktop PC/LaptopView deal
33.28$599.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWD WD181KRYZ Gold 18 TB Hard Drive - 3.5-inch Internal - SATA (SATA/600) - Server, Storage System Device Supported - 7200rpm (Renewed)View deal
33.33$599.9918 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedSeagateSeagate Exos X20 18TB 7200 RPM 512e SATA 6Gb/s 3.5" Enterprise Hard Drive - ST18000NM003D (Renewed)View deal
33.33$599.9918 TB1Internal 3.5"3.5"SAS7,200 RPMEnterpriseRenewedSeagateSeagate Enterprise ST18000NM004J Internal Hard Drive 3.5" 18TB 7.2K RPM SAS 12Gb/s for Servers *Desktop PC's Not Supported*(Renewed)View deal
33.64$739.9922 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedSeagateSeagate Exos 22TB SATA HDD 6Gb/s 7200RPM 3.5-inch Enterprise Hard Drive (ST22000NM000C) (Renewed)View deal
33.86$745.0022 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital Ultrastar DC HC570 WUH722222ALE6L1 0F48154 22TB 7200 RPM SATA 6Gb/s 512e 512MB Cache 3.5in Enterprise Hard Drive (Renewed)View deal
33.95$679.0020 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital Ultrastar DC HC560 WUH722020BLE601 0F38781 20TB 7200 RPM SATA 6Gb/s 512e 512MB Cache Power Disable 3.5in Enterprise Hard Drive (Renewed)View deal
34.39$619.0018 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NASRenewedWestern DigitalWestern Digital 18TB WD Red Pro NAS WD181KFGX 7200 RPM SATA 6 Gb/s CMR 256 MB Cache 3.5" Internal Hard Drive HDD (Renewed)View deal
34.45$689.0020 TB1Internal 3.5"3.5"SATA7,200 RPMRenewedWaterWater Panther WP Arsenal 20TB SATA 7200RPM 3.5-Inch DAS Hard Drive (Renewed)View deal
34.45$689.0020 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedWestern DigitalWestern Digital Ultrastar DC HC560 WUH722020BLE6L1 0F38784 20TB 7200 RPM SATA 6Gb/s 512e 512MB 3.5in Enterprise Hard Drive (Renewed)View deal
34.50$689.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T8 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Black) (Renewed)View deal
34.50$689.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMR Helium EnterpriseRenewedSeagateSeagate Exos X24 20TB Enterprise Hard Drive HDD SATA 6Gb/s 512MB Cache 7200 RPM 512e CMR Helium Sealed 3.5in Hard Drive ST20000NM000H (Renewed)View deal
35.00$769.9922 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T8 Series 22TB USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (Black) (Renewed)View deal
35.00$769.9922 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - 2 Year Warranty (22TB White) (Renewed)View deal
35.00$699.9920 TB1Desktop external—USB 3.2 Gen 2—NewAvolusionAvolusion PRO-G1 Series 20TB USB 3.2 Gen 2 (10Gbps) USB-C External Hard Drive for Windows or MacOS Desktop PC/Laptop (Silver)View deal
35.00$699.9920 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-T5 Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) (20TB White) (Renewed)View deal
35.00$699.9920 TB1Internal HDD—SAS7,200 RPMEnterpriseRenewedSeagateSeagate Exos X24 20TB Enterprise Internal Hard Drive HDD - 12GB/s SAS 7200RPM 2.5M MTBF (ST20000NM002H) (Renewed)View deal
35.45$709.0020 TB1Desktop external—USB 3.2 Gen 2—EnterpriseRenewedOtherLV22 20TB USB-C 10Gbps External HDD and HUB – Enterprise Hard Drive for Professional Media Creators and Work from Home Office Professionals (Renewed)View deal
35.91$789.9922 TB1Desktop external—USB 3.x—RenewedAvolusionAvolusion PRO-X Series USB 3.0 External Hard Drive for WindowsOS Desktop PC/Laptop (White) - (22TB) (Renewed)View deal
35.95$719.0020 TB1Internal HDD—SAS—CMR EnterpriseRenewedSeagateSeagate Exos X20 ST20000NM003D 20 TB Hard Drive - Internal - SAS (12Gb/s SAS) - Conventional Magnetic Recording (CMR) Method (Renewed)View deal
36.50$729.9920 TB1External HDD—USB 3.x—NewSeagateSeagate Expansion 20TB External Hard Drive HDD - USB 3.0, with Rescue Data Recovery Services (STKP20000400)View deal
37.17$669.0018 TB1Internal 3.5"3.5"SATA—SurveillanceRenewedWestern DigitalWestern Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 512MB Cache, 3.5" - WD180PURZ (Renewed)View deal
37.48$749.5020 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseRenewedSeagateSeagate (Renewed) Exos X22 20TB SATA 6Gb/s 7200RPM 3.5-inch Enterprise HDD (ST20000NM004E)View deal
37.50$749.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMRNewToshibaToshiba X300 20TB Performance & Gaming 3.5-Inch Internal Hard Drive – CMR SATA 6 GB/s 7200 RPM 512 MB Cache - HDWR62AXZSTAView deal
37.77$831.0022 TB1Internal 3.5"3.5"—7,200 RPMNASNewToshibaTOSHIBA N300 Internal Hard Drive 22 Tb 7200 RPM 512 Mb 3.5", W129161818 (Tb 7200 RPM 512 Mb 3.5 Serial Ata Iii)View deal
38.35$766.9920 TB1Internal 3.5"—SATA—NASNewToshibaToshiba - HDWG82AXZSTB - Toshiba N300 Pro HDWG82AXZSTB 20 TB Hard Drive - 3.5 Internal - SATA (SATA/600) - ConventionalView deal
38.52$693.2918 TB1Internal 3.5"3.5"SAS7,200 RPMEnterpriseRenewedSeagateSeagate Exos X18 18TB SAS 12Gb/s 7200RPM 3.5" Enterprise Hard Drive - ST18000NM005J (Renewed)View deal
39.50$869.0122 TB1External HDD—USB 3.x—NewSeagateSeagate Expansion 22TB External Hard Drive HDD - USB 3.0, with Rescue Data Recovery Services (STKP22000400)View deal
39.72$715.0018 TB1Internal 3.5"3.5"SAS—EnterpriseNewSeagateSeagate Enterprise ST18000NM004J Internal Hard Drive 3.5" 18TB SASView deal
39.95$799.0020 TB1Internal HDD—SAS7,200 RPMEnterpriseRenewedSeagateSeagate Exos X20 ST20000NM002D 512E/4KN SAS 12Gb/s 20TB 7200RPM 256MB Enterprise Hard Drive (Renewed)View deal
40.00$799.9920 TB1Desktop external—USB 3.x—NewBUSlinkBUSlink U3-20TS 20TB HDD USB 3.2 Gen 1 5Gbps/eSATA External Desktop DriveView deal
40.28$725.0018 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseNewSeagateSeagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00JView deal
41.00$902.1022 TB1Desktop external—USB 3.x—NewWestern DigitalWD 22TB My Book External Hard Drive, Desktop HDD with Password Protection, USB 3.0, SuperSpeed USB, Software for Device Management, Backup, Hardware encryption, Works with PC and Mac, BlackView deal
41.33$743.9018 TB1Desktop external—USB 3.x—NewWestern DigitalWestern Digital 18TB Elements Desktop External Hard Drive USB 3.0 for plug-and-play storage - Western DigitalBWLG0180HBK-NESNView deal
41.50$829.9920 TB1Desktop external—USB 3.x—NewWestern DigitalWD 20TB Elements Desktop External Hard Drive, USB 3.0 drive for plug-and-play storage - WDBWLG0200HBK-NESNView deal
42.59$937.0022 TB1Internal 3.5"3.5"SATA—EnterpriseNewToshibaToshiba 22TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG10AFA22TE)View deal
43.33$780.0018 TB1Desktop external—USB 3.x—NewWestern DigitalWD 18TB My Book Desktop External Hard Drive, USB 3.0, External HDD with Password Protection and Auto Backup Software - WDBBGB0180HBK-NESNView deal
43.41$868.1720 TB1Desktop external—USB 3.x—NewWestern DigitalWD 20TB Elements Desktop External Hard Drive - USB 3.0, BlackView deal
44.00$879.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NAS EnterpriseNewSeagateSeagate IronWolf Pro, 20 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST20000NT001)View deal
44.73$894.5120 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NASNewWestern DigitalWestern Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD202KFGXView deal
45.00$899.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMRNewToshibaToshiba X300 PRO 20TB High Workload Performance for Creative Professionals 3.5-Inch Internal Hard Drive – Up to 300 TB/Year Workload Rate CMR SATA 6 Gb/s 7200 RPM 512 MB Cache - HDWR62AXZSTBView deal
45.00$809.9918 TB1Internal 3.5"3.5"SATA—SurveillanceNewWestern DigitalWestern Digital 18TB WD Purple Pro Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 512 MB Cache, 3.5" - WD181PURPView deal
47.22$849.9918 TB1Internal 3.5"—SATA—NewToshibaToshiba MG09ACA18TE 18 TB Hard Drive - 3.5 Internal - SATA [SATA/600]View deal
47.45$949.0020 TB1Desktop external—USB 3.x7,200 RPMNewOyen DigitalOyen Digital Novus 20TB Rugged External USB-C 7200RPM Desktop Hard DriveView deal
47.75$859.4518 TB1Internal HDD—SATA—EnterpriseNewSeagateSeagate Exos X18 ST18000NM001J 18 TB Hard Drive - Internal - SATA (SATA/600)View deal
48.00$959.9920 TB1Internal HDD—SAS7,200 RPMEnterpriseNewSeagateSeagate Exos X24 20TB Enterprise Internal Hard Drive HDD - 12GB/s SAS 7200RPM 2.5M MTBF (ST20000NM002H)View deal
48.33$869.9518 TB1Internal HDD———NASNewToshibaToshiba N300 18TB NAS Internal Hard Drive for NAS SystemsView deal
48.58$874.4518 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NASNewSeagateSeagate 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)View deal
48.86$1,074.9922 TB1Desktop external—USB 3.x—NewWestern DigitalWestern Digital 22TB Elements Desktop External Hard Drive, USB 3.0 external hard drive for plug-and-play storage - WDBWLG0220HBK-NESNView deal
49.55$991.0020 TB1Internal HDD—SATA7,200 RPMCMR Surveillance EnterpriseNewSeagateSeagate Exos X20 ST20000NM000D 20 TB Hard Drive - Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage System, Video Surveillance System Device Supported - 7200rpm - 285View deal
49.69$894.4518 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NASNewWestern DigitalWD Red Pro 18TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 512MB CacheView deal
49.72$994.4520 TB1Internal HDD—SAS7,200 RPMEnterpriseNewSeagateSeagate Exos X20 ST20000NM002D 512E/4KN SAS 12Gb/s 20TB 7200RPM 256MB Enterprise Hard Drive,Mechanical Hard DiskView deal
53.00$1,059.9920 TB1Internal 3.5"3.5"SAS7,200 RPMEnterpriseNewWestern DigitalWD Ultrastar DC HC560 WUH722020BL5204 20 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS) - 7200rpm - 4Kn Format - 5 Year WarrantyView deal
53.84$1,184.5122 TB1Desktop external—USB 3.2 Gen 27,200 RPMEnterpriseNewSanDiskSanDisk Professional 22TB G-Drive Enterprise-Class External Desktop Hard Drive - 7200RPM Ultrastar HDD Inside, USB-C (10Gbps), USB 3.2 Gen 2, Mac Ready - SDPHF1A-022T-NBAAD, Dark GreyView deal
54.45$1,089.0020 TB1Internal HDD—SATA—NewToshibaToshiba 20TB MG10ACA20TE SATA 600GB 20in1 HDDView deal
54.54$1,090.7220 TB1Internal 3.5"3.5"SATA7,200 RPMEnterpriseNewWestern DigitalWestern Digital 20TB WD Gold Enterprise Class SATA Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, 512 MB Cache, 3.5" - WD203KRYZView deal
56.80$1,249.5822 TB1Internal 3.5"3.5"SATA—CMR EnterpriseNewWestern DigitalWD Ultrastar DC HC570 0F48155 22 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) MethodView deal
58.60$1,289.0922 TB1Desktop external—USB 3.2 Gen 27,200 RPMEnterpriseNewHGSTG-DRIVE 22TB External Desktop Hard Drive, Enterprise-Class 7200RPM Ultrastar Hard Drive Inside, USB-C (10Gbps), up to 280MB/s Read and 280MB/s Write, Mac-Ready - SDPHF1A-022TView deal
59.26$1,185.1620 TB1Internal HDD—SATA7,200 RPMNewSeagateBarracuda 7200.10 Seagate - Hard Drive - 20TB - Internal - 8.9 cm - SATA 6Gb/s - 7200rpm - Puffer: 512MBView deal
59.87$1,317.1122 TB1Desktop external—USB 3.x—NewWestern DigitalWD 22TB Elements External Hard Drive, Desktop HDD Storage, USB 3.0 Compatible, Fast Transfer Rates, Easy add on Storage for All Your Pictures, Videos, Music and documents, BlackView deal
59.98$1,199.5920 TB1Internal 3.5"3.5"SATA—NewSeagateSeagate Barracuda 20TB Internal Hard Drive, 7200 U/Min, 512MB Cache, SATA 6Gb/s, 3.5" (ST20000DM001)View deal
60.00$1,199.9920 TB1Internal 3.5"3.5"SATA7,200 RPMCMR NASNewWestern DigitalWestern Digital 20TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD201KFGXView deal
60.00$1,199.9920 TB1Desktop external—USB 3.x—EnterpriseNewGlyphGlyph Blackbox PRO 20TB 280 MB/s USB-C Enterprise Class Desktop Hard DriveView deal
60.24$1,204.8920 TB1Internal HDD———NewSynologySynology HAS5310-20T HDD with 20TBView deal
60.50$1,089.0018 TB1Internal 3.5"3.5"SATA—SurveillanceNewWestern DigitalWestern Digital 18TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256MB Cache, 3.5" - WD180PURZView deal
62.05$1,364.9922 TB1External HDD—Thunderbolt7,200 RPMEnterpriseNewOtherG-DRIVE 22TB Project, High-Capacity Hard Drive, Thunderbolt 3, USB (10Gbps), 7200RPM Ultrastar Hard Drive, Up to 260MB/s Read - SDPHG1H-022TView deal
62.05$1,364.9922 TB1External HDD—Thunderbolt7,200 RPMEnterpriseNewSanDiskSanDisk Professional 22TB G-Drive Project - External HDD, Thunderbolt 3, USB (10Gbps), 7200RPM Ultrastar Hard Drive, Up to 260MB/s Read - SDPHG1H-022T-NBAADView deal
65.00$1,299.9920 TB1Desktop external—USB 3.2 Gen 2—NewWestern DigitalWestern Digital 20TB My Book Duo Desktop RAID External Hard Drive HDD, USB 3.1, With Password Protection and Auto Backup Software - WDBFBE0200JBK-NESNView deal
66.65$1,333.0020 TB1Internal HDD———EnterpriseNewBuffaloBUFFALO Replacement Spare Hard Drive 20TB Enterprise-Grade for TeraStation 12-Bay (OP-HD20.0H2U-5Y)View deal
75.00$1,499.9920 TB1External HDD—Thunderbolt—NewSeagateSeagate LaCie 2big Dock 20TB External HDD - Thunderbolt and USB4 Compatibility, Data Recovery (STLG20000400)View deal
75.09$1,351.6818 TB1Desktop external—Thunderbolt—NewG-TechnologyG-Technology 18TB G-DRIVE with Thunderbolt 3 and USB-C Desktop External Hard Drive, Silver - 0G10804-1View deal
77.60$1,552.0020 TB1Internal HDD———NewiStorageiStorage diskAshur DT2 256-bit 20TB | FIPS Level 3 Certified | Secure encrypted Desktop Hard Drive | Password ProtectedView deal
77.70$1,554.0020 TB1Internal HDD———NewiStorageiStorage diskAshur DT3 256-bit 20TB - FIPS Level 3 Certified - Secure encrypted Desktop Hard Drive - Password ProtectedView deal
80.55$1,610.9920 TB1External HDD—USB 3.x—NewApricornApricorn 20TB Aegis Padlock DT 256-Bit Encrypted USB 3.0 Hard Drive (ADT-3PL256-20TB)View deal
82.92$1,658.4120 TB1Internal 3.5"3.5"SATA7,200 RPMNewSeagateSeagate Barracuda 3.5" 20TB Internal Hard Disk HDD PC 6Gb/s 512MB 7200rpm Authorized Dealer ST20000DM001/ECView deal

Price charts

Value map: capacity against price

$0$20$40$60$80$10016182022Bigger & cheaper than mostCapacity (TB)Price per TB

Each dot is one listing. Among drives at or above the median capacity (20 TB), the cheapest is Avolusion M5 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC... at $27/TB.

How prices are spread

02040Median $35$30$40$50$60$70Price per TBListings

Half of the 123 listings cost between $32 and $48 per TB; the median is $35. A listing in the left-hand bars is cheap for this category.

Price per TB by interface

$0$50$100SASSATAUSB 3.2 Gen 2USB 3.x

SATA has the lowest median ($33/TB) and SAS the highest ($40/TB). Interfaces with fewer than 5 listings are left out.

How to choose 20 TB hard drives

What to look for

  • Price per TB: compare with 16 TB, since a smaller drive may cost less per TB.
  • Backup and redundancy: this much data on one drive should always have a second copy.
  • Compatibility: older NAS boxes and external enclosures may not support the largest drives.
  • Noise and heat: expect noticeable noise and power use.
  • Warranty and condition: read whether the drive is new or renewed and who backs the warranty.

Best for

Homelabs, large NAS bays and archives that value the fewest drives possible.

Skip it if

You do not need the capacity, or you cannot back up the data.

20 TB price snapshot

Most listed brands

BrandListingsCheapestMedian
Seagate31$30$37
Western Digital25$29$43
MDD21$29$32
Avolusion20$27$32
Toshiba8$38$44

Quick facts

  • Middle 80% of prices: $30 to $60 per TB
  • Typical listing: 20 TB for $709
  • 17 brands with listings here
  • Median stated spin speed: 7,200 RPM (67 listings state one)
  • 11% state CMR recording
  • 15% are sold as NAS drives

How 20 TB compares

CategoryListingsCheapestMedianvs 20 TB
20 TB (this page)123$27$35—
2 TB207$25$75+113%
1 TB200$16$80+128%
4 TB200$20$50+42%
Internal982$7$49+41%
External535$21$58+66%
All HDDs1,517$7$50+43%

Median price per TB across current listings. "vs" shows each row's median against 20 TB.

Frequently asked questions

Is a 20 TB drive worth it?

If you need the capacity and have a backup plan, yes. Otherwise smaller drives can be cheaper in total, and the 16 TB median here is $31 per TB against $35 for this page.

Do 20 TB drives work with USB?

Some external desktop drives ship at this size. A bare internal drive needs an enclosure that supports it.

Is a 20TB hard drive worth it?

Large drives often give the lowest price per TB, but a single drive is a single point of failure. Pair a 20TB hard drive with a backup, and check that your NAS or PC supports the capacity.

How much do 20 TB hard drives cost per TB?

Across 123 listings, the middle 80% range from about $30 to $60 per TB, with a median of $35. That is 30% below the all-HDD median of $50 per TB. Prices change often, so check the current price on Amazon before you buy.

What is the cheapest of the 20 TB hard drives per TB right now?

At the last update it is Avolusion M5 Series 20TB USB 3.0 External Hard Drive for WindowsOS Desktop PC..., at $27 per TB. The cheapest listing is not always the best buy, so compare warranty, speed and reviews.

Prices and availability are as of 2026-10-28 and may change. Check the current price and specifications on Amazon before you buy. As an Amazon Associate we earn from qualifying purchases.