137GB limit on Laptop

The 80GB drive on Sony VGN-B3XP was about to die, so I purchased a new
160GB drive. Cloned the old one, fitted new one and works fine except
for the 137GB limit. The boot up BIS says 137GB IDE for the drive.

I contacted Sony and they said there was no BIS firmware update to
break the 137GB limit

Without a firmware update, do I just accept that I have 23GB I cannot
access? Not a big issue, just rather annoying.

Does anyone know of a reliable firmware update for the problem?

Michael