My Seagate ST3500320AS (firm SD35 ?) is not recognized in bios. The motor seems to run normaly and they are no clicks.
Then i use the hyper terminal with an rs232 TTL adapter i obtain such message at spin up :

F3 T>/2

F3 2>Z

Spin Down Complete
Elapsed Time 0.149 msecs
F3 2>U

Error 1009 DETSEC 00006008
Spin Error
Elapsed Time 16.672 secs
R/W Status 2 R/W Error 84150180
F3 2>

What can i do ?
I don't have data to recover and it's only a challenge to recover the disk and upgrade the firmware.