you should backup your data after successful access to the HDD, it is likely your HDD Damaged, don't be panic.
From Takis PuyerBray
Read Below*** If you are looking for an easy way to convert NTFS to FAT32 file system without losing data, then give Minitool Partition Wizard Free Edition a try.
From Project Phoenix Media
How to convert FAT32 to NTFS File system using cmd command 'convert' and without erasing data on the disk. Steps to do: Open cmd (command prompt ...
From Troubleshooting errors
Notice: This method doesn't work with exFat, you must format the drive, sorry. Converting File System To NTFS file system without having to format the drive .
From Hany Hamza
This Video will explain How to Convert a Local Disk or USB Drive FAT32 File format to NTFS file format Without loss in Data like Images, Videos, Audio etc.
Convert FAT32 to NTFS Without Formatting or Losing Data Today, FAT file systems are still commonly found on floppy disks, USB sticks, flash and other ...
From G-QUBE Tweak
A simple guide on how to format a External Hard Disk in exFAT, NTFS, FAT32! Formatting External Hard Drive, serves mostly to make it compatible with other ...
This is the easiest way to pertition Hard disk or sd card whatever in Windows Operating System (8,7,xp, vista) More Cool Stuff www.igoogleplay.info Samsung ...
From iGOOGLE PLAY
Convert FAT32 to NTFS (Without Format / Data Loss) in Windows 10,8,7,visat,Xp.
1. Plug in your USB flash drive to your computer. 2. Go to the start menu, type in "cmd" in a search bar, hit enter and then you can see something named "cmd.
From IT Magics