External Firewire HDD Cannot Support > 137GB

[morpheus]

Hi,
I recently bought a 200GB HDD and swapped it for the 80GB HDD that was
in my Maxtor external firewire enclosure.  However, FDISK only sees this
as a 137GB HDD.  I have another firewire enclosure (IO Data) with the
same 200GB HDD and it works fine, so I don't think the problem is with
my kernel, motherboard or firewire controller.
I've done quite a bit of Googling and discovered that this may be a
problem with the HDD controller in the enclosure itself.  I bought it
four years ago with the 80GB Maxtor drive preinstalled.  Maxtor offers
some patches for Windows to see larger drives, is there anything I can
do on Linux to make it work, or is it just a limitation of the
controller hardware? Is there a way to upgrade the firmware in the
enclosure?
hdparm doesn't want to return much, but here it is (sdb works fine, sda
doesn't):
# hdparm /dev/sdb
/dev/sdb:
 HDIO_GET_MULTCOUNT failed: Invalid argument
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 24792/255/63, sectors = 203928109056, start = 0

# hdparm /dev/sda
/dev/sda:
 HDIO_GET_MULTCOUNT failed: Invalid argument
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 16709/255/63, sectors = 137438952960, start = 0

-m

PS:
Using FC3, 2.6.9-1.667 on an IBM Thinkpad R32