If you will install OS or some other reasons,you need format your hard drive.But maybe there are some files that you have not backup before,then they lost.So you need recover the files from formatted hard drive.

        When drive has been formatted, encountered not formatted error,  if you just formatted your hard drive partition by or memory card by mistake, drives or card reading "the drive is not formatted, do you want to format it now?". Recovering files after formatted FAT, NTFS partition with file recovery tool to recover you reformatted file. Hard drive was formatted or crashes that occur due to physical damage to the hard drive, like, read/write heads sticking into disk platters, read/write head crash, spindle motor system failure, PCB failure etc., are very severe, and involves expertise handling. File be lost formatted damaged by these accident.

        How to get the formatted file back? The Aidfile recovery tool can help you find the formatted file on hard disk drive.
        As a best format hard disk data recovery tool,Aidfile Unformat program can give you a best solution to restore & rescue & repair missing or lost data and files after those hard drive format or damage or corrupt.such as MP4, hard disk drive Exfat and fat32 and ntfs partitions,usb flash drive,memory card,pen drive,usb stick,sd card,digital cameras,usb card,CF card,flash card,xD Picture Card,etc.

        Compare with other hard disk lost data rescue system,Aidfile lost data recovery service is easy to use and powerful. Some common symptoms of data loss are:
How to get data back from hard drive, usb, raw drive ?
        You can recover the deleted or formatted data to another free dirve. If repartition or the partition size are changed, the scaned data must be recovered to another free disk, DO NOT recover to the source disk
        Except hard drive,it also can recover data or files from many external drive after format.
        For example,usb drive,pen drive,usb pen,usb stick,usb card,memory card,memory stick,SD card,SanDisk drive,flash drive,iPod drive,iPhone drive,HDD drive,XD Card,IDE disk/drive,SSD,Smart Card.
        Aidfile recovery software also can recover HDD partition , deleted drive repartition recovery , damaged drive partition.
        Logical hard drive recovery can easily be performed using Data recovery software. Such recovery tools are very easy to use and thus allow us to have ‘Do It Yourself' data recovery in all possible logical data loss situations. Using data recovery software is the most economical and simple way to get your data back.

        The process of initializing these logical blocks on the physical disk platters is called low level formatting which is usually performed at the factory and is not normally changed in the field. High level formatting then writes the file system structures into selected logical blocks to make the remaining logical blocks available to the host OS and its applications.