Impact of changing drive letters (for external hard-disks) ?

First of all...awesome app! Thanks and I'm surely going to blog about this wonderful app once I am done testing it.

Here's something I wanted to ask...

I am planning to use the "portable" version on an external hard-disk to organize files/folders on that drive. Every time I hook up this drive to a new computer, it may be assigned different drive letters (depending upon the partitions on the computer). I was wondering if this will impact in any way the tagging.

For example, suppose my external drive is assigned "E:" on my personal machine and I tag a file under " E:\Music\*.* ". Once I have applied a tag, say "Music" to this folder, I was wondering if the application will work when I hook this drive to some other machine on which the disk might be assigned another drive letter, say "F:" ?

I hope I have articulated my problem. If not, please let me know if you want any clarifications.

PS: I was wondering if I might use relative pathnames using "..\" but the "Add Items" window only allows visual selection of files and folders, I am unable to edit the textual pathnames at all; perhaps letting users do that might solve the problem (if there IS a problem at all) ?

Keenly awaiting your response,
Thanks.