沒有驅動器字母為USB或火線驅動
當您連接您的USB或IEEE 1394年(火線)存貯設備(硬盤或USB驅動)到您的計算機，窗口將突然出現顯示USB大容量存儲器設備，驅動器然後被發現的通知消息。 然而，您就是不可能簡單地訪問驅動，并且沒有自動「Autoplay」提示，如果您使能它。
USB或火線存貯驅動在Windows Explorer或我的計算機窗口沒出現(不可利用和不容易接近)，雖然它被查出了，即使驅動在同一臺計算機以前適當地使用了。 在設備管理程序，一切包括USB插孔和USB根插孔，顯示適當工作。 在某些情況下，它也顯示它運作的USB或火線存貯驅動附上的和驅動，并且USB或火線驅動在Microsoft Management Console (MMC)也是將出現於計算機管理的盤管理。
另一種症狀到問題是您插入USB或火線驅動， 「安全地取消硬件」像將出現在窗口通知區域(系統盤子)。 當您在像時雙擊，驅動出現於名單，但，當您顯示盤的細節(然後由雙擊在驅動或選擇驅動點擊中止)時，沒有驅動器字母附有驅動。
起因為這個問題是所有驅動器字母已經沒有被分配到其他設備或被映射的聯網驅動器，使另外的驅動器字母可利用。 或它也許由早先分配到驅動由一個被映射的聯網驅動器或其他存貯設備佔去了的驅動器字母造成。
決議是分開被映射的聯網驅動器或其他存貯設備，釋放驅動器字母或早先被分配的信件分配到輔助存儲器設備。 如果您在MMC盤管理能看驅動，用鼠標右鍵單擊對此和選擇變動驅動器字母和道路，則點擊變動。 選擇是未使用和點擊OK的一個驅動器字母。 USB或IEEE 1394驅動可能現在是容易接近的。
它也是可能的 改變驅動器字母到一自由一個通過登記.
重要: 這是現狀提供，不用保單的機器翻譯的頁。 計算機翻譯也許是難瞭解。 參見 原始的英國文章 每當可能。
分享并且貢獻或者得到技術支持并且幫助在 我的數字式生活論壇.
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Entries (RSS)
August 15th, 2008 18:00
Anthony Maw post #31 - thank you, you’ve fixed my problem. Am on Vista and updated to Vista SP1 when a previously recognised external USB drive doesn’t show in Explorer anymore. Followed your instructions re: Show Hidden Devices and it worked! So thanks again.
August 6th, 2008 10:24
Funny thing is that I went into MMC and accessed the drive via right click / explore… never thought to look for a conflicting drive letter. But you were right on the money. Thanks!
July 22nd, 2008 23:22
This was exactly the information I was looking for. I knew what the problem was but I didn’t know where to change it. Thank you.
June 11th, 2008 04:27
the article described my problem to the t but the solution was one i had already attempted and which had failed. after going through disk mgmt and assigning a drive letter i am able to explore it ONLY through disk mgmt, it still will not show up in my comp or explorer. furthermore, when i disconnect my usb drive and reconnect it later i have to follow the same procedures to access it, additionally, the letter i had previously assigned to it is no longer available in the drop down menu of available letters. the device works fine on all other computers and OS’s, i’ve had this problem for almost a year with no solution. and no, i have no other drives interfering, just the c: and a cd drive. any help would be appreciated
May 26th, 2008 08:09
Great article. It is well written, gets straight to the point, and best of all, solved my problem. Thank you.
April 30th, 2008 03:22
No Drive Letter for USB or Firewire Drive article…Thank you. This article really helped. Have a great day!
April 17th, 2008 03:46
The problem has two possibilities: One is that a mapped drive letter supercedes the physical drive letter that Windows wants to assign. The solution is to change the highest mapped drive letter, like E: or F: drive to a letter lower down like G: or H: and then remount the USB drive. This issue is documented on a M$ KB. The other possible cause of the problem is that the volsnap.sys driver does not recognize the external USB device volume and thus does not assign it a drive letter. The solution is to open Device Manager, click View and then Show Hidden Devices. Down the list under Storage Volumes there is an Unknown Device. Right click on it, select Update Driver and let it automatically search. It should reinstall the drive as a Generic Storage device and then correctly assign a drive letter after that.
April 17th, 2008 03:44
The problem has two possible causes and different solutions:
One is that a mapped drive letter supercedes the physical drive letter that Windows wants to assign. The solution is to change the highest mapped drive letter, like E: or F: drive to a letter lower down like G: or H: and then remount the USB drive. This issue is documented on a M$ KB.
The other possible cause of the problem is that the volsnap.sys driver does not recognize the external USB device volume and thus does not assign it a drive letter. The solution is to open Device Manager, click View and then Show Hidden Devices. Down the list under Storage Volumes there is an Unknown Device. Right click on it, select Update Driver and let it automatically search. It should reinstall the drive as a Generic Storage device and then correctly assign a drive letter after that.
Anthony Maw, Vancouver, Canada
mailto:anthony@maw.bc.ca
tel/sms +1 604 318 9994
March 18th, 2008 13:00
This information really helped. My TSonic 610 MP3 player was not getting assigned a drive letter on Windows XP. I followed the instructions and went to Disk Management and assigned a different drive letter to the MP3 player. The problem was that the drive letter was already in use by a mapped network drive. Thanks a lot for sharing this information.
March 15th, 2008 20:01
I had a similar problem and I was able to resolve it. I found that the USB port connecter was not making complete contact with the hard dsik drive. I pressed it a little hard until all the pins were inserted completely. Then I plugged the USB cable to my computer and was able to see it in device manager in “Not initialized” status. To initialise it I had to format the drive and lose all the data in my external hard disk.
If I can remember correctly I noticed this issue after my computer crashed and after restarting my computer, it was running the disk check program which was deleting some indexing or something like it. These files were part of my external hard disk.
December 1st, 2007 12:46
I installed a new 120 gig Seagate hard drive with OEM install CDs from IBM/Lenovo for my Thinkpad. I’ve spent three days trying to solve this problem; I have tried the registry solution presented here, the disk management solution, using Acronis Disk Director Suite, and anything else I could find on the web TO NO AVAIL. I tried to delete the keys and that worked, but once I try to plug in any type of non-hard drive based device Windows XP Pro acts like a blind man with Alzheimers: it thought my USB flash drive was a PCI MODEM!
If I switch back to my trusty Fujitsu (which used the same system restore CDs by the way) everything is detected with no problems. WTF. Seriously Microsoft, go poke your eyes out with a stick. You won’t even stand behind your own product- charging $99.99 - $550 for incident support is worse than highway robbery. It’s like selling cars without a steering whell and charging for brakes. Keep it up and this life-long PC user who has less and less time for foolishness will buy a Mac. That’ll teach you. (yeah, I know it won’t, but it felt good saying it…).
November 29th, 2007 04:24
Ok, here is my usb problem
I have a user that when you insert his USB device it assigns it to a network drive. I go into the computer management and change it to another drive. It see it fine. I then plug in a new usb device and it once again reverts to the network drive. I does not keep the setting for the USB that I had assigned to it. It is on a windows XP environment and the system is locked down so that users cannot access the internet without prior approval. The user has had access with the usb drive in the past and I can change it but only for that USB drive. I have gone into administrative tools, computer management, service applications, services, MSsoftware shadow copy provider, then start-up type: set to “automatic” and the service status I clicked start thinking that this might work. It did not. Anyone with a suggestion as to how to solve this I would greatly appreciate it.