[prisat rawal]

actually my hp laptop showing me hard disk 301 error in bios when i am starting pc. after i scan hard disk . in result i get some damaged sectors. i Don't understand what i do. may i replace this or repair that by any way.

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You probably need to get a new drive and clone the old one before it fails completely if you can still boot into Windows.  This is not as difficult as you might think.  Which drive (part number) do you have in it now?  If you don't know:
 

Get the free version of Speccy:

 

http://www.filehippo...download_speccy (Look in the upper right for the Download

Latest Version button  - Do NOT press the large Start Download button on the upper left!)  

Download, Save and Install it.  Tell it you do not need CCLEANER.    Run Speccy.  When it finishes (the little icon in the bottom left will stop moving), 

File, Save as Text File,  (to your desktop) note the name it gives. OK.  Open the file in notepad and delete the line that gives the serial number of your Operating System.  

(It will be near the top about 10 lines down.) Save the file.  Attach the file to your next post.  (More Reply Options, Choose File, Open, Attach This File)

 

 

Speccy will not only show us the part number of the drive but it will also give us some info on the drive's condition.

[RKinner]

You probably need to get a new drive and clone the old one before it fails completely if you can still boot into Windows.  This is not as difficult as you might think.  Which drive (part number) do you have in it now?  If you don't know:
 

Get the free version of Speccy:

 

http://www.filehippo...download_speccy (Look in the upper right for the Download

Latest Version button  - Do NOT press the large Start Download button on the upper left!)  

Download, Save and Install it.  Tell it you do not need CCLEANER.    Run Speccy.  When it finishes (the little icon in the bottom left will stop moving), 

File, Save as Text File,  (to your desktop) note the name it gives. OK.  Open the file in notepad and delete the line that gives the serial number of your Operating System.  

(It will be near the top about 10 lines down.) Save the file.  Attach the file to your next post.  (More Reply Options, Choose File, Open, Attach This File)

 

 

Speccy will not only show us the part number of the drive but it will also give us some info on the drive's condition.

[Kemasa]

As said, most likely your disk is dying, so the sooner you backup your data the better. Most likely you need to replace the disk and it is better to do so before it completely fails.

[RKinner]

OK.  I understand that after a full format and reinstall that it is working OK.  It would still be a good idea to run Speccy and post the log so we can see what condition the hard drive is in.

[Kemasa]

If it got a lot of errors, it is unlikely that a format will fix it. It might mask it for a time.