Drive shows in Disk Manager as type Dynamic, and status of Invalid, with no drive letter. Right-click => Reactivate brings the error message "The operation is not allowed on the invalid disk pack."
I have a Seagate SATA 1TB HD I pulled functional from a Windows 7 system. When I connected it to my Toshiba Laptop with a SATA to USB adapter, also running Windows 7, the drivers installed, but no drive in Explorer. The device shows in Devices and Printers as "External", and Properties says...