The Samsung 850 Pro is the first SSD to use a new storage technology called 3D V-NAND. Samsung claims this lets them make even more spacious SSDs. Samsung also claims that 3D V-NAND increases performance. We were initially sceptical as the 256GB 850 Pro was actually slower than other SSDs at copying small files, managing 90MB/s, although this is still a respectable score. It blazed ahead when copying large files, though, with a jaw-dropping score of 613MB/s - it's easily the fastest SSD we've seen in this test. The Samsung 850 Pro is a cracking SSD, but the 256GB model costs £140, or 55p per gigabyte. The 512GB Crucial MX100 (see our review, Issue 427) costs less (£150 or 29p per gigabyte) for twice as much storage. Although it's not as fast at copying large files, it's still outstrips the 850 Pro in copying small files.
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