Why does my usb show up as blank usb storage or unsupported filesystem?

[AC Question]

blank usb storage or unsupported filesystem

when i connected my usb to my phone it shows 'usb storage blank or un supported filesystem'.pls tell how fix this problem

 

[B. Diddy]

Re: blank usb storage or unsupported filesystem

Welcome to Android Central! Which phone? Are you connecting the USB drive via an OTG adapter? Do you know if your phone supports OTG?