I am running windows 8 on a dell xps pc. I have 2 large 3tb and 4tb external seagate drives. After a day or so they lose part of the connection. You can see the drive and folders a couple of levels deep but you can't see files. If you unplug and start again everything is there. On other machines it's not a problem. When you try to eject usb hardware it displays that something is accessing the device. So it's not the drive, it's a driver or something else.
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