[CentOS] input/output error while copy

Fri Jan 14 09:01:52 UTC 2011
Ritika Garg <ritikagarg25 at gmail.com>

When I give the command "cp file1 file2" then the error comes:
cp: cannot create regular file `file2': Input/output error

This occurs sometimes and it occurs when I am giving the command inside a
external hard disk which is mounted by "ntfs-3g" manually.
Why does this error come?
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