Change or Delete System Drive Letter via Registry to Remove Conflict USB or FireWire Drive Letter变更或删除系统驱动器的信通过注册表，以消除冲突的USB或FireWire驱动器的信

In Windows operating system especially Windows XP, when plug in external USB or FireWire mass storage device such as USB key, flash drive, portable harddrive, the drive is not been assigned a drive letter by the system, hence the USB drive or FireWire drive is not showing in Explorer and no AutoPlay or AutoRun window pops up, although the device has been detected, in Safely Remove Hardware (show device but with no drive letter) wizard.在Windows操作系统特别是Windows XP中，当插件在外部的USB或FireWire大容量存储设备如USB密钥，闪存驱动器，便携式硬盘，驱动器是不可被指派一个驱动器号由系统，因此， USB驱动器或FireWire驱动器是未显示在Explorer和没有自动播放或自动运行窗口，持久性有机污染物，虽然该装置已侦测到，在安全删除硬件（查看设备，但是没有驱动器号）向导。 The cause is probably due to ’stupid’ behavior of XP where it won’t find an available letter from free letters pool when the USB or FireWire external drive which has previously mounted and assigned a drive letter is been inserted to computer USB or FireWire port again, but that previously allocated drive letter has been taken up and used by another storage devices.原因可能是由于'愚蠢的'行为XP的情况下它不会找到一个可用的信从免费的信件池时， USB或FireWire外接式磁碟机，其中先前已展开，并指派一个驱动器的信是被插入电脑USB或FireWire端口再次，但以前分配的驱动器的信件已采取的行动和所使用的另一种存储设备。 Another possible reason is all 26 letters in alphabet has been used, but this situation is rare and unlikely.另一个可能的原因是所有26个字母在字母表一直使用，但这种情况是罕见的和不可能的。

There is a有一个 solution to USB or FireWire drive not showing in system error解决的USB或FireWire驱动器不会显示在系统错误 . 。 However, the disconnect conflicted storage device to free up the drive letter fix may not practicable or usable by some, such as computer which are on a network or system running data transfer activity to all its drive assignments continuously flow without stopping, and thus disconnect or reassigning any mapped drives, networked drives, removable drives or other storage drives is not an option.不过，断开冲突，储存装置，以腾出的磁碟机代号修补程序可能并不可行，或实用一些，如电脑，这是对一个网络或系统运行的数据传输活动的所有驱动器的任务，不断流不停车，从而断开或重新任何映射的驱动器，网络驱动器，可移动驱动器或其他存储驱动器，是不是一种选择。

In this situation, there is another workaround hack to fix the no USB or FireWire drive issue.在这种情况下，有另一种可行哈克修复没有USB或FireWire驱动器的问题。 The workaround fix relies on the registry tweak below to change the drive letter that has been previously assigned to the mounted USB or FireWire portable mobile flash or hard disk drive.替代修补程序依赖于注册表调整下面的更改驱动器一封信中说，先前已分配给安装的USB或FireWire便携式移动Flash或硬盘驱动器中。 Or if users wish, can opt to delete any reference to the detected drives by the device so that when the storage device is plugged in again, the whole drive letter assignment will be start from fresh, and clean.或如果用户愿意，可以选择删除任何参考检测驱动器装置，因此当存储设备是在再次堵塞，整个驱动器号分配将开始从新鲜，清洁。

1. Login to Windows as an Administrator.登录到Windows作为管理员。
2. Open Registry Editor by typing regedit (or regedt32.exe in older Windows prior to XP) in Run command of Start Menu and then press Enter.打开注册表编辑器中键入regedit （或Regedt32.exe在旧的Windows XP中前）在运行命令的开始菜单，然后按下ENTER 。
3. Navigate to the following registry key:浏览到以下注册表项：

   HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices hkey_local_machine \系统\ mounteddevices

4. Optional step which not required in Windows XP or later, right click on MountedDevices , then select Permissions .可选步骤，其中不须在Windows XP或更高版本中，右键点击mounteddevices ，然后选择权限 。 You can also click Permissions from the Security menu.您也可以点击的权限从安全菜单上。
5. Optional step which not required in Windows XP or later, check the option to make sure that Administrators have full control to the registry key.可选步骤，其中不须在Windows XP或更高版本，请检查选项，以确保管理员有完全控制到注册表中的关键。 Change and revert back this setting when you are finished with the reset of the steps.变化和回复此设置，当您完成重置的步骤。

   

6. If you run above 2 steps in OS earlier than Windows XP, quit regedt32.exe and run regedit.exe.如果您运行上述2个步骤，在操作系统Windows XP之前，退出Regedt32.exe和运行Regedit.exe 。
7. Also in the HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices registry branch selected, in the right pane, find and locate a registry value which represents the troubled USB or FireWire drive.此外，在HKEY_LOCAL_MACHINE \系统\ mounteddevices注册表分支选中，在右窗格中，找到并找到注册表值代表的困扰USB或FireWire驱动器。 The registry key should have the name that resembles the format of \DosDevice\X: where X can be any alphabet letter which corresponding to your physical system drive letter.注册表项应该有名称类似于格式\ dosdevice \ x ：其中X可以是任何英文字母排列的信相应到您的物理系统的驱动器号。

   

   Here’sa guidelines that you can follow to quickly determine which registry key is linked to your conflicted drive letter:以下是指引，您也可以按照迅速确定哪些注册表项是连接到您的冲突，磁碟机代号：

   • Exclude \DosDevice\A: and \DosDevice\B: which normally reserved for floppy disk drives.排除\ dosdevice \一：和\ dosdevice \ B组：通常保留给软盘驱动器。
   • Exclude \DosDevice\C: which normally is the system root drive.排除\ dosdevice \ c ：通常是系统的根驱动器。
   • If you have more than one fixed hard disk drives, then any drive letters that are using by them is not possible linked again, UNLESS the additional hard disk drive is added AFTER you first use the USB or FireWire device that now unable to show.如果你有一个以上的固定硬盘驱动器，那么任何驱动器号正在使用他们是不可能再次联系，除非额外的硬盘驱动器是补充后，你第一次使用的USB或FireWire设备，现在无法显示。
   • Same case with CD-ROM or DVD-ROM optical drive as above reasoning.同一案件具有CD - ROM或DVD - ROM光盘驱动器作为上述推理。
   • If you have inserted and mounted a lot of thumbdrives, USB flask drive, or external hard disks before, you will likely still see a lot of remaining registry values that you won’t know which is which.如果您有插入，并采取了很多thumbdrives ，瓶的USB驱动器或外置硬盘前，您可能会仍然看到了不少，其余的注册表值你不会知道哪个是哪个。 In this case, double click on each remaining registry key values to view its binary data.在这种情况下，双击对每个其余的注册表项的值，以检视它的二进制数据。 Inside the binary data, there will be trace of the name of the device that this registry key represents.内二进制数据，将有微量的名称，该装置此注册表项的自觉性。 For example, figure below shows a Sandisk Cruzer micro USB flash drive.举例来说，下面的数字显示， SanDisk的Cruzer Micro盘USB闪存驱动器。

     

     With this information, search for a registry value that contains name of your USB or FireWire drive brand and model that having problem showing up in Explorer.与这方面的资料，寻找一个注册表值包含的名称，您的USB或FireWire驱动器的品牌和型号，考虑的问题，显示在浏览器。

8. Once the correct registry value is determined (for example, \DosDevices\F:), right click on the registry value name, and the select Rename .一旦正确的注册表值是确定的（例如， \ dosdevices \传真： ） ，右击该注册表值的名称，并选择重命名 。

   

9. Change the drive letter (in the example is F) to another unused drive letter that hasn’t been used by another other drives, then press Enter.改变驱动器号（在该例子是f ）向另一未使用的驱动器一封信中说，尚未使用的另一种驱动器，然后按下ENTER 。
10. Now insert and plug in the USB or FireWire device into the port again (if it’s already inserted, take it out and re-insert again).现在插入插头在USB或FireWire设备进入港口再次（如果它已经插入，采取出去，重新插入再次） 。 The drive letter for the USB and FireWire should now appear and you can use the drive normally and properly again.磁碟机代号为USB和FireWire现在应该会出现，您可以使用的驱动器通常和妥善再次。
11. For OS earlier than Windows XP which you have previously change the permissions for the registry key, quit Regedit.exe and start Regedt32.exe, and change the permissions back to the previous setting for Administrators (which should be Read Only).操作系统Windows XP之前您先前在改变权限的注册表项，退出Regedit.exe和启动Regedt32.exe ，和更改权限返回到以前的设置为管理员（应唯读） 。

It’s also possible to simply delete the devices registry keys instead of renaming it.它也可能只需删除设备的注册表项而不是重新命名它。 Deletion is helpful is users really can’t find the the registry value for the drive letter that having problem.删除是有帮助的是用户真的无法找到该注册表值为驱动器一封信中说，有问题。 But make sure that you do a backup for the registry branch by exporting MountedDevices key, as mistake may cause your system unbootable.但要确保你做了备份注册表中科出口MountedDevices项，错误可能会导致您的系统无法启动。 The delete all possible USB drives, FireWire drives and external drives which have drive letter temporarily only when inserted in the system, and DO NOT delete any of the fixed hard disk drives or CD/DVD optical drives registry values.删除所有可能的USB驱动器， FireWire硬盘和外接式磁碟机，其中有磁碟机代号暂时只有当插入在该系统中，并没有删除任何固定的硬盘驱动器或CD / DVD光碟机的注册表值。

IMPORTANT : This is a machine translated page which is provided "as is" without warranty. 重要说明 ：这是一个机器翻译网页是“按原样”提供的担保。 Machine translation may be difficult to understand.机器翻译可能很难理解。 Please refer to请参阅 original English article英文原版的文章 whenever possible.只要有可能。

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