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Hi there! I have a mac mini late 2014 with a HardDrive and I want to replace it to a ssd, but which version of ssd fits in the mac mini because when I googled to see prose I saw to sizes ssd: A square one:

And a thin and oblong one.

Which one fits the mac mini? Thanks in advance!!

Either one or both: Mac mini Late 2014 Hard Drive Replacement Mac mini Late 2014 SSD Replacement Of course the 2.5” is going to be much cheaper. The blade you have shown will not work well in a Mac. Get one made to run in Macs, either from OWC or Transcend. See @danj answer on the drive you pictured here: How can install a Samsung 970 EVO into a MacBook Pro 2012? What do you currently have in it?