Missing write-velocity specification of the HDD in use as USB-station at 32PFL9606H12.

After installing a new portable HDD ( Western Digital 'MyPassport' 500GB) on a side USB and complete the formatting procedure of the HDD by the TV I received the message ' isn't usable by lac of write-velocity' .
The user-manual only specify 32 or 250GB not any speed, how to solve this problem?