I have a Toshiba External HDD which is not being recognized by any of my xp machines but works fine on my windows 8.1 and windows 10 machines. This started when my son "borrowed" the drive for something and plugged it into a windows 10 machine.Now it is no longer recognized y the windows xp machine I normally use it with, nor my other xp machine. It works fine on my Windows 8.1 machine and his Windows 10 machine. He said a message came up when he plugged it into his windows 10 machine and he clicked to correct the error. I think that may have started this problem. Anyone know how to correct this so I can use it on my xp machine again?