Hi Experts
i wanna know the difference between
Samsung 850 EVO 500 GB M.2 3.5-Inch SSD
Samsung 850 EVO 500GB 2.5-Inch SATA III Internal SSD
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Gerwin Jansen, EE MVETopic Advisor Commented:
m2 is a form factor for internal mounted SSD devices

where 2.5 inch has a traditional hard drive form factor
Gary CaseRetiredCommented:
For those two units, the only difference is the form factor => one is a traditional 2.5" drive; the other is an M.2 unit that mounts on a motherboard M.2 slot.    Both use the SATA-3 interface and they have the same specifications.    Most likely they're electrically identical and differ only in their packaging.

HOWEVER, M.2 slots also support SSDs that have PCIe interfaces instead of SATA.    These can have FAR faster transfer speeds.    For example, this relatively inexpensive unit  reads at 770MB/s, compared to a max of 540MB/s for the Samsungs:

... and this Samsung unit reads at 1170MB/s and writes at 930MB/s:

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Gary CaseRetiredCommented:
I presume it's self-evident, but you can only use an M.2 unit if your motherboard has an M.2 slot :-)
MASWORLDAuthor Commented:
WOW thanks
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