Hardware :: Unable To Label USB Flash Drives (Cannot Initialize)

Using Debian Lenny. I'm trying to label my usb flash drives. I checked on the Internet and found a page, but I can't get it to work: [URL]. I umounted the usb drive. I checked it with
Debian:~# blkid
/dev/sda1: UUID="B1CC-3C4F" TYPE="vfat"

But when I try to make a label I get this message:
Debian:~# mlabel -i /dev/sda1 ::VFAT_DOC
Can't open /dev/sda1: No such file or directory
Cannot initialize '::'
mlabel: Cannot initialize drive

If I try mlabel -i /dev/sda1 ::VFAT_DOC when the drive is mounted
I get this output:
Debian:~# mlabel -i /dev/sda1 ::VFAT_DOC
Total number of sectors (7855032) not a multiple of sectors per track (62)!
Add mtools_skip_check=1 to your .mtoolsrc file to skip this test but no label is attached to the drive.

I added this to /etc/mtools.conf:
drive p: file=/dev/sdb1
and ran this command:
mlabel p:VFAT_DOC
and still can't get it to work
Can't open /dev/sda1: No such file or directory
Cannot initialize 'P:'
mlabel: Cannot initialize drive