Greets - I am trying to back up files to an external hard drive via USB. When hooked up it appeared to write some files to the HD. None of the windows files already on the drive weren't displayed. I thought Android recognized windows files. Also, didn't realize that Android would write files to the drive on connection. In an attempt to research this I connected the drive to my HP/Compaq notebook. It showed the windows files still there and accessible but after about a minute XP complained that the USB device wasn't recognized. Anybody have a clue as to what is happening here? This makes no sense to me. Have Avast on the Samsung Galaxy SM-T900 tablet with Android 5.1.1 and Avast on the HP/Compaq notebook.