PC operating system is windows 7 Samsung tablet operating system is android 4.4.2 I am working on my mom's tablet to get files onto an external hdd. I am connecting through usb. It says usb device not recognized. So I changed cables but no go. I tries going into device manager but still has explanation point by it. I hear the sound from my computer that something is being plugged in like normal. I have tried a hard reset on the tablet but no go. I have did this once before but now it is not working btw. I tried looking for usb debugging but there is no option on her tablet, so I am assuming she has one that there is no such option. She had malware programs to check for viruses but nothing. I tried downloading smart switch but that did not work. I know my usb is working fine on my laptop because the external hdd in the usb port works fine. But when I plug in the Samsung, no go. I am running out of options, I have no idea what I should try next. New to this forum btw.