Sandisk Ultra Dual USB 3.0 64G - what file format when it comes new?

New drives over 32GB are formated as exFAT, a Windows standard for at least a decade.  Vista, 7, 8, 10.  As to the Mac and Android OSs I don’t know.  Older OSs may not.

You have 2 choices imho, return the drive to the seller, or return it to SanDisk, for a replacement.

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