Windows 7 не добавя автоматично буква на устройство
Windows 7 64bit was recognizing the USB device when it was plugged in, and the drive was shown under Computer Management -> Storage -> Disk Management, but no drive letter was being assigned. Manually right-clicking on the drive here, and selecting Change Drive Letters and Paths… would allow me to manually assign a drive letter, but that would not solve it for any new USB devices.
The solution in my case was very simple: open up a command prompt, and type the following:
automount enable <enter>
exit <enter> (to quit diskpart)
exit <enter> (to quit the command prompt)
Now insert any USB hard drive and a drive letter will be assigned automatically.