I have 3 X 4TB Seagate backup plus USB drives that I want to rotate for backup on our new windows server 2012 system. The server is a dell poweredge T320. When I plug in a drive for the first time it works fine. However, If I unplug the drive and plug in the next drive then the drive is not recognized until I reboot the system. These drives worked fine on the old Windows 2003 server. If I go to device manager there is an exclamation mark over the USB Attached SCSI (UAS) Mass Storage Device and in the properties the device status is "Windows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory. (Code 38)"
I have tried unistalling, deleting...etc. If I try to update the driver it says that I have the latest. Any help would be appreciated.