who makes your laptop ?
don't matter it's in your first post.
goto their website and see if they have a firmware update for that drive, unlikely as 2.40 is further up than nec version 2.25
this your laptop LIFEBOOK C1320
there seem to be a few people having problems with the 2.40 firmware, I emailed fujitsu asking where the other firmware is for this drive, they may reply, they may not.
Other people have used firmware 2.25 original firmware, search google on how to go to 2.25, liggy&dee