Disk problem

[eric tanguy]

I found these lines in dmesg but i don't know what it is and how to solve
this  :

hdc: command error: status=0x51 { DriveReady SeekComplete Error }
hdc: command error: error=0x50
end_request: I/O error, dev hdc, sector 787072
hdc: command error: status=0x51 { DriveReady SeekComplete Error }
hdc: command error: error=0x50
end_request: I/O error, dev hdc, sector 0
Thank you.
Eric