hi all,
this is my permenent error.how to clear this error permenently...
please help me out. here is my error output.
please tell me clearly as i am very new to Linux(beginner)
hda: packet command error: status=0x51 { DriveReady SeekComplete Error }
hda: packet command error: error=0x50
thanks in advance.
It sounds like you have a bad disk drive. Make very sure that you have a backup of any data that care about. If the drive is bad you will need to replace it.
Depending on your disto, you should look at the kernel source, and do a deep troubleshooting, only if you want of course 
Like Perderabo said, it's possible that this is a bell for bad HD, and you are advised to do backup in case of HD crash.
Here is an article describing the similar issue, HTH.