Cannot change the drive letter - Vista

I'm changing the drive letter for a USB external hard drive.  I go to disk management and right click on the external drive and select change drive letter and paths.  I chose my new drive letter - click Yes to the warning - and that she fails.  Dialog box is titled - logical disk manager and the error message is: the parameter is incorrect.

Help, please.
Details:
Windows Vista Edition Home Premium SP1
Seagate 2.5 "laptop hard drive - USB
also tried with Maxtor external hard drive 3.5 "

Hello

I have two laptops running Vista. On each of them, I have an external USB or SATA drive that I use as a backup partition.
I have my own backup utility, and I like to use the letter B for the backup.

When I change sometimes the discs I've met this parameter is incorrect problem on two computers - sometimes I can change using the method above and sometimes I can't.  I tried to stop the disk cache, anti-virus etc etc etc. with totally inconsistent results so far as I can tell.

Today I tried to boot mode safe mode (F8 at startup) and tried the same steps as before and it worked on the first attempt.

Maybe it's worth a try.

Doug

Tags: Windows

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