There exist an ample of data recovery software which can recover the inaccessible, corrupted, or damaged data that you really need. These software are applicable for all the storage devices including hard drive ,external drive, CD , pen drive etc.
In a Windows system, the command for recovery is chkdsk. This command also ensures whether the hard drive is in healthy condition or not. This can find, repair, or recover lost information. For those who have Mac systems, then Disk First Aid is the software to use. In UNIX, there is fsck.
In case , if these commands are not able to fix these issues then the user should go for some third party partition recovery software. These hard drive recovery software are able to fix the issue of missing partition and missing operating system also.
The HDD Recovery software can get back data even after a hard drive crash. Even if you don't know programming language, you can use it with its advanced user friendly features. Finally, the Undelete program can get you back those files that were deleted unintentionally.
Perhaps one of the most excellent data recovery software out there is Stellar Phoenix Windows Data Recovery Software V4.2 (The latest and advanced version). It is so powerful, in whatever way the file was deleted, it can still be recovered. Even a windows re-installation cannot prevent this program from recovering the files deleted this way. It is also fine tuned enough to recover about 185 file types.