WD Purple 4 TB Surveillance Hard Disk Drive, Intellipower 3.5 Inch SATA 6 Gb/s 64 MB Cache 5400 rpm

Price range: £36.30 through £399.99

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With IntelliSeek technology, WD Purple drives are able to calculate optimum seek speeds; this keeps power consumption low so ambient noise and vibrations are at a minimum
With a high workload rating WD Purple is designed to handle the distinct demands of contemporary video surveillance DVR and NVR systems

ORICO M200 internal SSD MSATA 256GB 3D NAND read/write speed up to 560MB / S 6Gbps internal solid state drives for PC or…

Price range: £54.66 through £139.37

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Interface: mSATA III (6.0 Gbps), Max Read Speed: 560 MB/s Max Write Speed: 516MB/s, performance may vary based on system hardware & configuration.
Mini Size: 30*51*3.3mm, saving space, Suitable for all kinds of laptop and desktop

Netac SSD 120GB Internal SSD Hard Drive Disk Solid State Drive SATA SSD 2.5 Inch SATAIII Easy to Install for Laptop…

Price range: £12.79 through £45.89

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Durable Design: Netac Solid State Drives with aluminum shell have a durable solid design which is engineered to resist vibration and shock, helping to keep your data safe over time.
Ultra Fast: This solid state drive performs up to 5x faster than a typical hard disk drive, with sequential read speeds of up to 510MB/s. You will appreciate an overall better computer experience!

Western Digital 1TB WD Blue Mobile Hard Drive HDD – 5400 RPM, SATA 6 Gb/s, 128 MB Cache, 2.5″ – WD10SPZX

Price range: £14.33 through £75.90

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Reliable everyday computing
WD quality and reliability

WD 1TB Elements Portable HDD, External Hard Drive, USB 3.0 for PC & Mac, Plug and Play Ready – WDBUZG0010BBK-WESN, Black

Price range: £30.51 through £119.00

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USB 3.0 and USB 2.0 Compatibility
Fast data transfers