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Cheapest 3.5" drives ranked by price per terabyte

All 3.5" drives on Amazon.co.uk, ranked by cost per terabyte (£/TB) from Keepa price history. Prices refresh daily with 24-hour movement and all-time-low flags. Filter by capacity, technology or condition and click through for the full history of any drive.

last updated: 2026-09-04 17:31:16

🔥 Today’s best deals

Seagate Exos 7E2 2 TB Internal Hard Drive HDD – 3.5 Inch 6 Gb/s 7200 RPM 128 MB Cache for Enterprise, Data Centre (ST2000NM0008)
Seagate Exos 7E2 2 TB Internal Hard Drive HDD – 3.5 Inch 6 …
£151.74 £75.87/TB
▼ 35.3% 24h
WD AV-GP Enterprise 2 TB 3.5-inch SATA Internal Hard Drive
WD AV-GP Enterprise 2 TB 3.5-inch SATA Internal Hard Drive
£98.90 £49.45/TB
▼ 26.7% 24h
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST14000NE0008)
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3…
£430.99 £30.79/TB
▼ 25.3% 24h
Seagate Barracuda (ST500DM009) 3.5" 500GB Internal Hard Disk Drive (SATA 6Gb/s, 7200 rpm, 32MB Cache)
Seagate Barracuda (ST500DM009) 3.5" 500GB Internal Hard Dis…
£44.50 £89.00/TB
▼ 20.8% 24h
Seagate ST10000VN0004 HDD Internal 10 TB IronWolf SATA 3.5 Computer Hard Disk Drive - Silver
Seagate ST10000VN0004 HDD Internal 10 TB IronWolf SATA 3.5 …
£614.37 £61.44/TB
▼ 17.0% 24h
Condition
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£/TB Price Size Tech Form Factor Condition Description
£23.04£599.0026 TBHDD3.5"Renewed
Seagate Exos 26TB Internal Hard Drive, 3.5 Inch HDD, SATA3, 256MB Cache (Renewed) Buy
£23.54£659.0028 TBHDD3.5"Renewed
Seagate Exos 28TB internal server hard drive ST28000NM000C 3.5" HDD SATA 6Gb/s 7200RPM 512MB Cache (Renewed) Buy
£25.47£407.4416 TBHDD3.5"New
Toshiba MG Series 16TB internal server hard drive MG08ACA16TE 3.5" HDD SATA 6Gb/s 7200RPM 512MB Cache 24/7 Buy
£26.39 £633.31+3.0% 24h24 TB3.5"Renewed
Seagate EXOS X24 24TB Interne Festplatte 3.5 Zoll SATA 3 Gbit/s 512 MB, ST24000NM000C (Renewed) Buy
£26.76£321.1312 TBHDD3.5"Renewed
HGST - WD Ultrastar DC HC520 HDD | HUH721212ALE600 | 12TB 7.2K SATA 6Gb/s 256MB Cache 3.5" Internal Hard Drive with Helium Data Center (Refurbished) Buy
£27.18£271.8010 TBHDD3.5"Renewed
Hitachi HGST WD Ultrastar DC HC510 10TB 7200RPM SATA 6Gb/s 3.5-inch SED Hard Drive - HUH721010ALE601 (0F27605) (Renewed) Buy
£27.42£274.2110 TBHDD3.5"Renewed
MDD - HGST He10 (HUH721010ALE601) 10TB 7200RPM 128MB Cache SATA 6.0Gb/s 3.5inch Enterprise Hard Drive (Renewed) Buy
£29.17£525.0018 TB3.5"Renewed
Seagate Enterprise 3.5" 18000 GB 7200 RPM 18 TB 3.5" 7200 RPM SATA ST18000NM00J (Renewed) Buy
£30.79 £430.99-25.3% 24h14 TBHDD3.5"New
Seagate IronWolf Pro, 14 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST14000NE0008) Buy
£31.60£189.616 TBHDD3.5"New
Seagate BarraCuda 6 TB Internal Hard Drive HDD – 3.5 Inch SATA 6 Gb/s 5400 RPM 256 MB Cache for Computer Desktop PC (ST6000DM003) Buy
£32.19£515.0016 TB3.5"Renewed
Seagate EXOS X16 16TB Interne Festplatte 3.5 Zoll SATA 6 Gbit/s 256 MB, ST16000NM001G (Renewed) Buy
£32.19£515.0016 TBHDD3.5"Renewed
Seagate Exos X18 Enterprise 16TB CMR 3.5" Hyperscale SATA Hard Drive Model Number: ST16000NM000J (Refurbished) Buy
£32.58 £390.99+0.0% 24h12 TBHDD3.5"New
Seagate IronWolf Pro, 12 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST12000NE0008) Buy
£33.06£595.0018 TBHDD3.5"Renewed
Seagate IronWolf Pro 18TB ST18000NT001 Interne NAS Festplatte 3.5 Zoll HDD, Serial ATA III, 7200RPM, 256MB Cache (Renewed) Buy
£33.13£265.008 TBHDD3.5"New
Seagate BarraCuda, 8 TB, Internal Hard Drive, SATA 6 Gbit/s, 3.5", 5400 RPM, 256 MB Cache for Desktop PC (ST8000DM004) Buy
£33.20£398.4012 TB3.5"Renewed
Seagate IronWolf NAS 12TB Interne Festplatte CMR 3.5 Zoll Sata III 256MB, ST12000VN0007 (Renewed) Buy
£34.25£410.9912 TBHDD3.5"New
Toshiba N300 12TB Internal NAS Hard Drive, 3.5’’ SATA HDD, 7200 RPM, 24/7 Operation, Supports 1-8 bay systems, 128MB Cache, 180TB/Year workload, 3yr Warranty (HDEXZ13ZNA51F). Buy
£34.46£895.9926 TBHDD3.5"New
WD Purple Pro 26TB Smart Video 3.5" Internal Hard Drive, AllFrame AI Technology, 7200 RPM, SATA 6 GB/s, 550TB/yr, 512MB Cache Buy
£34.72£625.0018 TBHDD3.5"New
Seagate IronWolf Pro 3.5-inch 18TB Internal Hard Disk HDD CMR 3.5 Inch Data Recovery ST18000NT001 6Gb/s 256MB 7200 rpm 24 Hour Operation PC Buy
£35.00£70.002 TBHDD3.5"New
Seagate ST2000VM003 Pipeline HD 2 TB 3.5-Inch Internal Hard Drive - BlackUsed £64.99 · £32.50/TB Buy
£35.94£575.0016 TBHDD3.5"New
Toshiba 16TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG08ACA16TE) Buy
£36.06 £577.00-0.2% 24h16 TBHDD3.5"New
Seagate IronWolf, 16 TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 5,400 RPM, 256MB Cache, for RAID Network Attached Storage, 3 year Rescue Services (ST16000VN001) Buy
£36.19 £579.07-3.8% 24h16 TBHDD3.5"New
Seagate IronWolf Pro, 16 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (‎ST16000NE000) Buy
£37.30£745.9920 TB3.5"New
Seagate SkyHawk AI ST20000VE003 - Festplatte - 20 TB - intern - 3.5" (8.9 cm) - SATA 6Gb/s - Puffer: 512 MB - mit 3 Jahre Seagate Rescue Datenwiederherstellung Buy
£37.42 £224.50-11.9% 24h6 TBHDD3.5"New
Toshiba S300 6TB Internal Surveillance Hard Drive, 3.5’’ SATA HDD, Supports up to 64 HD cameras at a 180TB/Year workload (HDWT860UZSVA) Buy
£37.49£299.928 TBHDD3.5"New
Seagate SkyHawk AI Internal Surveillance Hard Drive HDD 8TB 3.5" SATA 6Gb/s 256MB Cache DVR/NVR Security Camera System Rescue Services Model No.:ST8000VE001 Buy
£37.50£74.992 TBHDD3.5"New
Generic 3.5" SATA Desktop Hard Drive for PC, Mac, CCTV DVR, NAS, RAID (2TB) Buy
£37.67£225.996 TBHDD3.5"New
Seagate IronWolf Pro, 6 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST6000NE000) Buy
£38.00£303.998 TBHDD3.5"New
WD Blue 8TB 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, 256MB Cache, 2 Year Warranty Buy
£38.00£607.9916 TBHDD3.5"New
Seagate SkyHawk AI ST16000VE002 - Hard drive - 16 TB - internal - 3.5" - SATA 6Gb/s - buffer: 256 MB - with 3 years Rescue Data Recovery Buy
£38.06£609.0016 TBHDD3.5"New
Seagate SkyHawk AI, 16 TB, Surveillance Internal Hard Drive HDD – 3.5 Inch SATA 6 Gb/s 256 MB Cache for DVR NVR Security Camera System, and Three-year Rescue Services (ST16000VE00) Buy
£38.06£684.9918 TBHDD3.5"New
Toshiba N300 18TB Internal NAS Hard Drive, 3.5’’ SATA HDD, 7200 RPM, 24/7 Operation, Supports 1-8 bay systems, 512MB Cache, 180TB/Year workload, 3yr Warranty (HDWG51JUZSVA). Buy
£38.33£230.006 TB3.5"New
Seagate IronWolf Pro 6TB Interne hard disc 8.9cm (3.5 Zoll) SATA III ST6000NE000 Bulk Buy
£38.44£615.0016 TBHDD3.5"New
Seagate IronWolf 16TB SATA III 3.5" Hard Drive - 7200RPM, 256MB Cache Buy
£38.75 £154.99-2.5% 24h4 TBHDD3.5"New
Seagate BarraCuda 4 TB Internal Hard Drive HDD – 3.5 Inch SATA 6 Gb/s 5400 RPM 256 MB Cache for Computer Desktop PC Laptop (ST4000DM004)Used £139.00 · £34.75/TB Buy
£38.95£38.951 TBHDD3.5"New
Bipra CCTV Camera CCTV System DVR NVR Sata Hard Drive 3.5" SATA Surveillance Storage Hard Drive (1TB) Buy
£39.20£392.0010 TBHDD3.5"New
Seagate BarraCuda Pro 10 TB Internal Hard Drive Performance HDD – 3.5 Inch SATA 6 Gb/s 7200 RPM 256 MB Cache for Computer Desktop PC, Data Recovery (ST10000DM0004) Buy
£39.50£316.028 TBHDD3.5"New
Seagate SkyHawk 8TB, Video Internal Hard HDD, 3.5", SATA 6Gb/s, 256MB Cache, for DVR NVR Security Camera System, with in-house Data Rescue Services, FFP (ST8000VXZ10) Buy
£39.67£237.996 TBHDD3.5"New
WD Red Plus 6TB NAS 3.5" Internal Hard Drive - 5400 RPM, SATA 6 Gb/s, CMR, 256MB Cache Buy
£39.75£238.496 TBHDD3.5"New
WD Purple 6TB Surveillance 3.5" Internal Hard Drive, AllFrame Technology, 180BT/yr, 256MB Cache, 3 Year WarrantyUsed £238.49 · £39.75/TB Buy
£39.88£319.008 TB3.5"New
SKYHAWK 8TB SURVEILLANCE 3.5IN 5400RPM 6GB/S SATA 256M Buy
£39.90£478.7712 TBHDD3.5"New
Toshiba 12TB N300 Internal Hard Drive – NAS 3.5 Inch SATA HDD Supports Up to 8 Drive Bays Designed for 24/7 NAS Systems, New Generation (HDWG21CUZSVA) Buy
£40.00 £400.00+2.6% 24h10 TBHDD3.5"New
Seagate IronWolf Pro, 10 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST10000NT001) Buy
£40.00£240.006 TBHDD3.5"New
Seagate IronWolf Pro, 6 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST6000NT001) Buy
£40.00£639.9816 TBHDD3.5"New
Toshiba N300 16TB Internal NAS Hard Drive, 3.5’’ SATA HDD, 7200 RPM, 24/7 Operation, Supports 1-8 bay systems, 512MB Cache, 180TB/Year workload, 3yr Warranty (HDWG51GUZSVA). Buy
£40.28 £161.10-7.0% 24h4 TBHDD3.5"New
Toshiba S300 4TB Internal Surveillance Hard Drive, 3.5’’ SATA HDD, Supports up to 64 HD cameras at a 180TB/Year workload (HDWT840UZSVA) Buy
£40.29 £483.47+0.0% 24h12 TBHDD3.5"New
Seagate IronWolf ST12000VN0008 - Hard drive - 12 TB - internal - 3.5" - SATA 6Gb/s - 7200 rpm - buffer: 256 MB Mechanical Hard Disk Buy
£40.66£243.976 TBHDD3.5"New
Seagate IronWolf, 6 TB internal Hard Drive, NAS HDD, 3.5 Inch, 5400 U/Min, CMR, 64 MB Cache, SATA 6 GB/s, 3 Years Rescue Service, Modellnr.: ST6000VN006 Buy
£40.67£488.0912 TBHDD3.5"New
Toshiba 12TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG07ACA12TE) Buy
£40.79£407.9210 TBHDD3.5"New
WD Red Plus 10TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6Gb/s, CMR, 256MB Cache Buy
£41.00£409.9910 TBHDD3.5"New
Seagate 10 TB IronWolf NAS 3.5 Inch Hard Drive ST10000VN0008 (SATA 6 Gb/s/256 MB/7200 RPM) Buy
£41.00£410.0010 TBHDD3.5"New
Seagate IronWolf Pro, 10TB, Internal Hard Drive, NAS, 3.5 Inch, SATA, 6GB/s, 7200 RPM, 256MB Cache, for RAID Network Attached Storage, 3 year Rescue Services, FFP (ST10000NEZ008) Buy
£41.00£410.0010 TB3.5"New
Seagate IRONWOLF PRO ST10000NE0008 10TB SATA 7200 RPM 3.5 256MB 3.5 IN, ST10000NE0008 (RPM3.5 256MB 3.5IN) Buy
£41.11 £575.60+0.0% 24h14 TBHDD3.5"New
Toshiba 14TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG07ACA14TE) Buy
£41.37 £330.99+1.4% 24h8 TBHDD3.5"New
Seagate IronWolf, 8 TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 5,400 RPM, 256MB Cache, for RAID Network Attached Storage, 3 year Rescue Services (ST8000VN004) Buy
£41.49 £497.88+0.3% 24h12 TBHDD3.5"New
WD Red Plus 12TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6Gb/s, CMR, 256MB Cache Buy
£41.67£500.0012 TBHDD3.5"New
Synology HAT5300 12TB 3.5" 7200rpm SATA HDD; Designed for 24/7 environments Buy
£41.90 £754.20+9.6% 24h18 TBHDD3.5"New
WD Red Pro 18TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache Buy
£42.17£927.6522 TBHDD3.5"New
Toshiba 22TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG10AFA22TE) Buy
£42.50£340.008 TBHDD3.5"New
Toshiba 8TB S300 Pro Surveillance HDD - 3.5' SATA Internal Hard Drive Supports up to 64 HD cameras at a 180TB/Year workload (HDWT720UZSVA) Buy
£42.50£170.004 TBHDD3.5"New
Seagate Skyhawk 4 TB, Video Internal Hard HDD – 3.5", SATA 6Gb/s, 256MB Cache, for DVR NVR Security Camera System, with in-house Rescue Services (ST4000VX016) Buy
£42.68 £939.00+0.4% 24h22 TBHDD3.5"New
WD Red Pro 22TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache Buy
£42.88 £857.57+0.6% 24h20 TBHDD3.5"New
WD Red Pro 20TB NAS 3.5" Internal Hard Drive - 7200 RPM, SATA 6 Gb/s, CMR, 512MB Cache Buy
£43.00£171.994 TBHDD3.5"New
Seagate IronWolf 4 TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6 Gb/s 5,400 RPM 256 MB Cache for RAID Network Attached Storage, Rescue Services (ST4000VN006) Buy
£43.18 £431.75+4.6% 24h10 TBHDD3.5"New
Toshiba 10TB S300 Surveillance HDD - 3.5' SATA Internal Hard Drive Supports up to 64 HD cameras at a 180TB/Year workload (HDWT720UZSVA) Buy
£43.25£778.4818 TBHDD3.5"New
Toshiba 18TB Enterprise Internal Hard Drive – MG Series 3.5" SATA HDD for Server, Storage, 24/7 Operation, Hyperscale, Cloud (MG09ACA18TE) Buy
£43.50£347.998 TBHDD3.5"New
Toshiba N300 8TB NAS 3.5-Inch Internal Hard Drive - CMR SATA 6 GB/s 7200 RPM 256 MB Cache - HDWG480XZSTA, Silver Buy
£43.50£347.998 TBHDD3.5"New
Toshiba N300 8TB Internal NAS Hard Drive, 3.5’’ SATA HDD, 7200 RPM, 24/7 Operation, Supports 1-8 bay systems, 512MB Cache, 180TB/Year workload, 3yr Warranty (MN10ADA800S) Buy
£43.66 £611.26+6.5% 24h14 TBHDD3.5"New
Seagate IronWolf Pro 14 TB NAS RAID Internal Hard Drive - 7,200 RPM SATA 6 Gb/s 3.5-inch (ST14000NE0008) Buy
£43.75£699.9916 TBHDD3.5"New
WD Red Pro 16TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache Buy
£43.75£524.9912 TBHDD3.5"New
WD Purple Pro 12TB Smart Video 3.5" Internal Hard Drive, AllFrame AI Technology, 7200 RPM, SATA 6 GB/s, 550TB/yr, 256MB Cache Buy
£43.90£438.9910 TBHDD3.5"New
Seagate IronWolf 10TB, NAS, Internal Hard Drive, CMR, 3.5 Inch, SATA, 6GB/s, 7.200 RPM, 256MB Cache, for RAID Network Attached Storage, Data Rescue Services, FFP (ST10000VNZ00) Buy
£44.08£1,057.9924 TBHDD3.5"New
Seagate Barracuda 24TB Internal Hard Drive, 7200 U/Min, 512MB Cache, SATA 6Gb/s, 3.5" (ST24000DM001) Buy
£44.42£533.0012 TBHDD3.5"New
Seagate IronWolf internal hard drive 3.5 12TB HDD 3 years warranty 256MB 7200rpm 24 hours operation PC NAS for RV sensor ST12000VN0008 Buy
£44.50 £356.00+10.2% 24h8 TBHDD3.5"New
WD Red Plus 8TB NAS 3.5" Internal Hard Drive - 5640 RPM Class, SATA 6Gb/s, CMR, 128MB Cache Buy
£44.80£447.9910 TBHDD3.5"New
Seagate Exos 7E10 10TB Internal Hard Drive HDD - 3.5 Inch 4Kn SAS 6GB/s, 7.200 RPM, 256MB Cache and 2M MTBF for Enterprise, Data Centre (ST10000NM002B) Buy
£45.00£179.994 TBHDD3.5"New
Toshiba S300 4TB Surveillance 3.5” Internal Hard Drive – CMR SATA 6 Gb/s 5400 RPM 128MB Cache - HDWT140UZSVAR Buy
£45.00 £360.00+5.8% 24h8 TBHDD3.5"New
WD Red Pro 8TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 256MB Cache Buy
£45.49£45.491 TBHDD3.5"New
Western digital WD AV-GP - Hard Drive (Serial ATA III, 1000 GB, 8.89 cm (3.5"), 0.7W, 5.3W, 5.3W, 5.3W) Black Buy
£46.00 £460.00+9.5% 24h10 TBHDD3.5"New
WD Red Plus 10TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6Gb/s, CMR, 256MB Cache Buy
£46.25£185.004 TBHDD3.5"New
Western Digital Purple 4TB Surveillance 3.5 Inch SATA 6 Gb/s Hard Disk Drive with Allframe 4K Technology - 180TB/yr, 64MB Cache, 5400rpm - WD40PURZUsed £125.00 · £31.25/TB Buy
£46.86£1,124.6124 TBHDD3.5"New
WD Red Pro 24TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache Buy
£46.96 £469.56+1.4% 24h10 TBHDD3.5"New
WD Purple Pro 10TB Smart Video 3.5" Internal Hard Drive, AllFrame AI Technology, 7200 RPM, SATA 6 GB/s, 550TB/yr, 256MB Cache Buy
£47.13£377.008 TBHDD3.5"New
Seagate IronWolf 8TB NAS Hard Drive 3.5" 5400RPM 256MB Cache Buy
£47.24 £188.94-6.9% 24h4 TBHDD3.5"New
WD Purple 4TB Surveillance 3.5" Internal Hard Drive, AllFrame Technology, SATA 6 Gbit/s, 180TB/yr, 128MB Cache Buy
£47.29 £378.33-0.0% 24h8 TBHDD3.5"New
WD Purple Pro 8TB Smart Video 3.5" Internal Hard Drive, AllFrame AI Technology, 7200 RPM, SATA 6 GB/s, 550TB/yr, 256MB Cache Buy
£47.38£379.008 TBHDD3.5"New
WD Red Pro 8TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 256MB Cache, 5 Year Warranty Buy
£47.58 £285.46+3.4% 24h6 TBHDD3.5"New
WD Red Plus 6TB NAS 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, CMR, 256MB Cache Buy
£47.63£190.514 TBHDD3.5"New
WD Purple 4TB Surveillance 3.5" Internal Hard Drive, AllFrame Technology, 180BT/yr, 256MB Cache, 3 Year Warranty Buy
£47.72 £381.77-5.7% 24h8 TB3.5"New
TOSHIBA 8.9cm (3.5") 8TB SATA3 NAS N300 7200RPM internal bulk Buy
£47.75 £381.98+0.0% 24h8 TBHDD3.5"New
Western Digital WD Purple 8TB Surveillance 3.5" Internal Hard Drive, AllFrame Technology, SATA 6 Gbit/s, 180TB/yr, 128MB CacheUsed £328.36 · £41.05/TB Buy
£48.21£674.9014 TBHDD3.5"New
Seagate IronWolf 14TB NAS Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage (ST14000VN0008) Buy
£48.26£772.2016 TBHDD3.5"New
Seagate IronWolf"Internal Hard Drive 3.5 16TB HDD 3 Year Warranty 256MB 7200rpm 24 Hours Operation PC NAS For RV Sensor ST16000VN001 Buy
£48.43 £290.57-1.2% 24h6 TBHDD3.5"New
WD Red 6TB NAS 3.5 Inch Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, CMR, 64 MB Cache - WD60EFRX Red WD60EFRXUsed £189.99 · £31.67/TB Buy
£48.50£194.004 TBHDD3.5"New
WD Red Plus 4TB NAS 3.5" Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, CMR, 256MB Cache Buy
£48.75 £975.00+32.7% 24h20 TBHDD3.5"New
Seagate IronWolf Pro ST20000NE00 RV sensor 8.9 cm (3.5") NAS 20TB HDD (CMR) Buy
£48.88 £488.81-0.3% 24h10 TBHDD3.5"New
WD Red Pro 10TB NAS 3.5" Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR Recording Technology, 512MB Cache Buy
£49.00£147.003 TBHDD3.5"New
WD Red 3TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD30EFRX Buy
£49.00£195.994 TB3.5"New
Seagate IronWolf Pro ST4000NT001 3.5" 4TB SATA Buy
£49.30£493.0010 TBHDD3.5"New
Seagate IronWolf Pro, 10 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST10000NE0004) Buy

3.5" drives: the best value per terabyte

3.5" is the standard desktop and NAS hard drive size, and consistently gives the lowest cost per terabyte on the whole site. The table above ranks every 3.5" drive by real £/TB.

  • Desktop internal: the cheapest bulk storage available — ideal for backups, media libraries and archives.
  • NAS-rated: WD Red Plus/Pro, Seagate IronWolf, Toshiba N300 — built for 24/7 multi-drive use.
  • Renewed enterprise: Seagate Exos and WD Ultrastar pulls often show the single lowest £/TB on the site at large capacities — see what to check first.

If you need portability instead, browse 2.5" drives or ready-made external drives.

Frequently asked questions

How does disks.co.uk rank 3.5" drives?

We rank every 3.5" drives by real cost per terabyte (£/TB) — the live Amazon.co.uk price divided by capacity — so the best value appears at the top. Prices refresh several times a day from Keepa, with 24-hour movement and all-time-low flags.

What is the cheapest 3.5" drives right now?

The top of the table shows the cheapest 3.5" drives by £/TB. Prices update daily, so check back for new all-time lows.

How do I choose the right 3.5" drives?

Compare £/TB for the capacity you need, check the price history for a genuine deal, and weigh up speed and warranty. Our buying guides explain the trade-offs.