Ignore a drive completely
There are some devices around which behaves strange. USBDLM can ignore such drives.
The right drives are configured by means of their device ID, see Letters by Device ID how to get it.
Sample for the Apple iPod whose iTunes-Software deals with it's drive letter too:
[IgnoreDevices]
DeviceID1=ven_apple&prod_ipod
DeviceID1 to DeviceID9 can be configured.
Ignoring the Apple iPod is already build in because the iTunes Software seems to be triggered by the iPod's drive letter and when USBDLM changes it, iTunes gets confused.
If it shall be handled by USBDLM anyway then force it by using a criterion DeviceID in its drive letter section:
[DriveLetters]
DeviceID=ven_apple&prod_ipod
Letter=X