Maxtor USB Drive

I just bought a new system with Vista Home Premium and my only problem has
been writing to my Maxtor One Touch II USB external drive in Quicken. When
I had my drive on the old system, one of the things I used it for was a
backup copy of my quicken file. After I installed Quicken on the new
machine, I pointed the Quicken software to the USB drive in order to use
that file. It did it fine. It read the file and opened it up for me. When
I went to backup my file it tells me "unable to access the disk in drive J,
be sure the disk is not write protected". There really isnt a disk in drive
J because drive J is a disk, the one touch USB disk. Im not sure why it is
doing this. I can write to the USB one touch using other applications. Is
this a quicken problem? Any help would be appreciated. Thanks.

Thomas