Change Windows Network Icons & USB Drive Icons
This video briefly covers changing network drive icons in Windows, and adding custom icons to USB drives.
The relevant registry key/s that needs to be edited can be found under:
HK_CURRENT_USER\Software\Classes\Applications\Explorer.exe\Drives
Under Drives, add a new key just called the letter of the drive you want to identify (ie. "H", and under that a new key called "DefaultIcon".