Yes, the drive is toast and you will need a new one.  You may or may not be able to recover data yourself - to try, purchase a 2.5" USB 2.0 drive case of the appropriate type (SATA or PATA) and mount the drive in it.   Attach it to a working system and see what you can recover.  If you can't get the data back yourself, there are drive recovery services that can probably still retrieve your data - Drive Savers, Ontrack, etc.  They're expensive - budget $2,500 or so - but they can usually get the data from a failed drive.

what model system do you have?

2.5" USB 2.0 drive case of the appropriate type (SATA or PATA) and mount the drive in it. 

Can you please kindly explain or point out how can i mount the drive ? Currently, I am having the same error and want to try the way you explained. Thank you

Hello EJN63,

Thank you for your quick reply. My model is Dell Studio XPS 16. Please kindly let me know if you need any further details.

And is it easy to remove the drive from my notebook ? Need any manual or can we just take it out easily ? I am afraid to take it out and my place have no dell support center. That's why

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=40000092%20600006255&IsNodeId=1&Description=usb%20enclosure%202.5%20sata&name=2.5%22

You need something like this -- remove the drive and install it in the external case:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817729011

Attach to a working system and see if you can read some or all of your data.

Thanks for the answer EJN63. Just buy that enclosure and put the drive. And that enclosure comes with usb drive ? So that I can connect to another computer ? Or how's it working ? Will it be just detect when i plugin or mount mean need to do something ? Sorry for my noob question.

download a linux liveCD and  burn it

http://www.scata.org.uk/mediawiki/index.php?title=Data_recovery

shows you how

Hi to all, i am having the same problem with my dell N5110, when i tried a self test there is an error indicating

Error code 2500-0142

validation 33125

MSG: Hard Drive 0

self test unsuccessful. Status = 79

what HDD enclosure should i buy?

Thanks and regards!