Question mark folder after reboot and cannot detect other boot option! My mac froze during some heavy hard disk activity which forces me to power down the machine.

It's a 13 inch MacBook Pro with mountain lion which I bought roughly last year but updated the OS.

But after starting again, all I can see is a folder with a question mark flashing.

I try to reset the nvram but it's the same.

When I click on option button on restart and go into disk utility, I do not see any other disk besides the disk-0 which have 1.39GB space.

Does this means my partition is corrupted or something?

Please advise.

Thanks!
just to update.

the hard disk actually crashed!!!

omg, can't believe that actually happened.

and the guys at the service center told me my data was unrecoverable...

guess i learn my lesson the hard way.

so what i did was after they renew my mac with a new hdd, 

i bought myself two external hdd,

one for time machine backup

and one for all my other files,

so i don't keep any master copy of data on my mac hdd anymore.