I have two Sony 4GB USB and they are of the same model. I connect one of them to my xperia sp via a USB otg cable and it can be successfully recognized. However， when i connect another USB to my sp，the phone was unable to recognize。I have checked both of them on my PC and they function normally. Anyone knows what's wrong? Thank you
I think your unrecognized usbs file system is differentto other so you must check them o pc.one of them file system can be FAT other can be NTFS.if the problem is this,you must recovery and change file system of other one
