My seagate hdd is showing rt instead of st on asus motherbaord

I was using Seagate 320 Gb Hdd ST-3320820A since my last shutdown of computer it is showing RT3320820A capacity 0 GB.
I am using Asus Motherboard with Amd Cpu Socket Am2
I connected this hdd to another pc but there is no problem is shows the orginal model and capacity of 320 Gb.
please help me to sort out the problem.


thanks is advace,

my email is raja_sidd@rediffmail.com