Sent this to Kingston tech support :

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250 GB SSD won't show in file Explorer, but does show in the Windows 7
Device Manager under "Disc drives".

Your tech indicated : "... access Device Manager, locate the drive and
perform the following... 1) Right-click on the unallocated volume and
select Initialize (use MBR to initialize). 2) Right-click on the
unallocated volume once again and this time select New Simple Volume.
Follow the new simple volume wizard to setup your drive for data
storage. Once the format process completes, your drive will appear in
explorer as a storage drive."

Where is the "unallocated volume" ? I don't see it anywhere in the
Device Manager. Probably a dumb question, but what is "... MBR ..." ?

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Informed comments most welcome & thanks.