"sd card is blank unsupported file system"

[AC Question]

Hey guys,

I got home from work this afternoon and out of no where this message ""sd card is blank unsupported file system" appears on my Samsung Galaxy S4.
I can't access or see anything on the card. Even when I connect my phone to the computer the drive doesn't show up.

Anyone know if there's a fix to this or if I can recover my data? I have all my photos from my recent US trip on there

Thanks