Checking the hard disk for errors on your primary drive is very, very rarely required in GNU/Linux, most checking is automated on start-up if it is required. If you do need to check the hard disk for errors you will first need to unmount it. Then use the file system checker, fsck.
| fsck.file_system_type | 
If you had an ext3 file-system then it would be:
| fsck.ext3 | 
|  | Also try | |
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| You can also try using: 
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