Why drive letter external for the reasigns Windows Vista and how to stop it from happening

I have Windows Vista Home Premium with the latest service packs and updates installed on my machine.
From time to time, when I connect the external USB HDD, previously assigned letter of Exchange to another.
After that the media library files and setup do not work properly. I have to manually assign.

Why this is happening and more important How to stop from happening at all in the first place?

Thanks in advance

Windows assigns the next available drive letter when you connect an external drive. During his previous letter assigned is no longer available it will be assigned the next drive letter. I have an external hard drive with three partitions, I assigned the letters X, Y and Z, whenever I connect the drive on my laptop, it will display the letters that are always available.

Change, add, or remove a drive letter
http://Windows.Microsoft.com/en-us/Windows-Vista/change-add-or-remove-a-drive-letter

Tags: Windows

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