[lug] FC5 Computer does not recognize Memorex 1 GB Thumb Drives

[bof]

Hello,

I have three 1 GB Memorex thumb drives that are not recognized under
Fedora Core 5 on my desktop system, and cannot be mounted using the
standard command "mount -t vfat /dev/sda1 /mnt." When this command is
issued, it returns an error message "mount: special device /dev/sda1
does not exist". The thumb drives in question can be used on the same
computer when running Windows XP, and are mountable on several other
computers running FC5 and FC6.

I can mount both a Memorex 256 MB and Memorex 2 GB thumb drive. When 
one of these is plugged in I get these messages in /var/log

    scsi2 : SCSI emulation for USB Mass Storage devices
    usb-storage: device found at 46
    usb-storage: waiting for device to settle before scanning
      Vendor: Memorex   Model: USB2 ThumbDrive   Rev: 2.00
      Type:   Direct-Access                      ANSI SCSI revision: 02
    ready
    SCSI device sda: 512000 512-byte hdwr sectors (262 MB)
    sda: Write Protect is off
    sda: Mode Sense: 03 00 00 00
    sda: assuming drive cache: write through
    SCSI device sda: 512000 512-byte hdwr sectors (262 MB)
    sda: Write Protect is off
    sda: Mode Sense: 03 00 00 00
    sda: assuming drive cache: write through
     sda: sda1
    sd 2:0:0:0: Attached scsi removable disk sda
    sd 2:0:0:0: Attached scsi generic sg0 type 0
    usb-storage: device scan complete

and I can then mount the drive using the standard "mount" command.

However, when one of the 1 GB drives is plugged in, I get these 
messages in /var/log/dmesg and in /var/log/messages

    usb 1-1: new full speed USB device using uhci_hcd and address 125
    usb 1-1: new full speed USB device using uhci_hcd and address 126
    usb 1-1: new full speed USB device using uhci_hcd and address 2
    usb 1-1: new full speed USB device using uhci_hcd and address 3

These messages go on indefinitely until I unplug the thumb drive, and
"the special device /dev/sda1 does not exist" error message occurs 
when I issue the mount command.

Any thoughts from anyone as to what is going on and how I can get the 
1 GB drives to work like the other ones?

BOF