wooky69
Android Enthusiast
Can you download "Diskinfo" from the play store and run it. In settings select, show mount path, expert mode and show unmounted partitions. Does that give you any clues? You should be able to see file system details etc and you'll see if your SD card is mountable and writable.
Also if you have enough free space can you make a Nandroid backup to internal memory, this will show that TWRP is working and you can then copy the backup to your PC.
Also if you have enough free space can you make a Nandroid backup to internal memory, this will show that TWRP is working and you can then copy the backup to your PC.