the message further says it's blank or has unsupported filesys, there is an unrecognised image that i'm unable to delete, and I'm not able to delete any other of the images in my gallery.
Welcome to Android Central! Which device do you have? Go to Settings>Storage--does the SD card register there at all? Are you able to Unmount it? If so, then go ahead and Unmount, then remove the SD card. Insert it into your computer's SD reader, and run chkdsk to look for bad sectors: http://forums.androidcentral.com/am...guide-using-chkdsk-fix-corrupted-sd-card.html