How to recover data from old unallocated hard disk

Hi, sunilkumar319!

Are you meaning that the hard disk isn't attached as part of a computer anymore or meaning something else, please?

Thanks!

Easeus should be able to help you

There is a free edition
Free Data Recovery Software to free recover deleted files and recover formatted or corrupt hard drives - EASEUS Data Recovery Wizard Free Edition.

If does not help, depending on how important data may be, there are software you can purchase but no guarantee

Then can always format the drive and have the extra space