Hi.. thanks guys for the firmware info..
I already updated mine (the 500GB ST3500320AS SD15 one).. works perfectly fine..

to update the firmware (from the readme file) :

Basic instructions:
1) Create the FreeDOS bootable floppy or CD-ROM.
2) Use a standard desktop PC with an integrated SATA controller, or
a common SATA add-in controller like a Promise SATA150-TX2.
3) Disconnect all PATA or SATA devices from the system, except the
device needing the firmware update.
4) Boot the system using the update floppy or CD.

...and after that u need to select ur HDD version such as A, B or C (ex: A => ST3500320AS)