USB Drive Letter Manager（简称：USBDLM）是微软推出的Windows服务，此工具可控制窗口的驱动器号分配给USB设备。作为系统服务运行，使其独立登录用户的权限，所以也没有必要给用户的权限更改驱动器号。
它会自动解决了USB驱动器和网络或SUBST驱动器当前登录的用户之间的冲突。此外，您可以定义新的默认字母USB驱动器，保留驱动器字母。它可以处理非USB驱动器，当BusType或配置的DeviceID。
内含32位和64位两个版本，可按自己的系统选择使用。
下面是原版介绍：
USBDLM is a Windows service that gives control over Window's drive letter assingment for USB drives. Running as service makes it independent of the logged on user's privileges, so there is no need to give the users the previlege to change drive letters.
It automatically solves conficts between USB drives and network or subst drives of the currently logged on user.
Furthermore you can define new default letters for USB drives and much more.
When a removable drive (USB flash drive, flash card reader, portable hard drive) is attached for the first time, Windows mounts it to the first available 'local' drive letter. If there is a network share on this letter, Windows XP will use it anyway for the new USB drive because since XP network shares are specific to the current user and not visible in the context of the system where the letter is assigned. The USB drive then appears to be invisible.
You can change the letter assignments in the Windows Disk Management Console with a lot of mouse clicks but you have to do it again for every new device.
And, for USB devices that have no serial number (in violation of the USB standards) you have to do it too when you attach it to a different USB port.
USBDLM can for newly attached USB drives:
- check if the letter is used by a network share of the currently logged on user and assign the next letter that is really available
- reserve letters, so they are not used for local drives
- assign a letter from a list of new default letters, also dependend on many different criteria as the active user, drive type, connection (USB, FireWire), USB port, volume label, size and others
- assign letters for a specific USB drive by putting an INI file on the drive
- remove the drive letters of card readers until a card is inserted
- show a balloon tip with the assigned drive letter(s)
- define autorun events depending on many different criteria
- many other things, see help file, available online as HTML version too
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