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Given recent reports of fan issues with certain models, how does one tell if they have an SSD from Samsung or from SanDisk?

Go to the :apple: icon in the upper left, choose "About this Mac", then "More Info" then "System Report" and in the left-hand pane, choose "Serial-ATA" and it should then tell you what SSD (or HDD, if equipped) you have.
 
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