Originally Posted by janakiramulu
By doing that
1q) did i reformatted the partition? i think the new filesystem(ext4) has no knowledge of the data that was on it when it had a FAT filesystem.
Yes, you reformatted - and certainly ext4 has no knowledge of the prior data.
2q)how to do undo operation,i tried to change the filesystem type to fat/ntfs in terminal using command --sudo mkfs -t FAT /dev/sda5.
result:its showing text message-'mkfs.FAT: No such file or directory'(not in single quote)
i had very imp data in d:drive
plz provide good solution for this
The only "good" solution is to restore from your most recent backup. Being "very imp data", you of course have a recent backup.
Other than that, search LQ for testdisk, photorec and forensic. This comes up all the time.
Recovery won't be simple, or probably complete.