USB Flash not recognised

SecureAccess version 3 resolves the issue with El Capitan IIRC. You will need to get to a windows or older version of Mac OSX and decrypt you files. Then update to SA v3 and reencrypt the file. After the update it should work with El Capitan.

http://kb.sandisk.com/app/answers/detail/a_id/2399/ 

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