Files replaced by an "unreadable" found.000 folder

Hello,

I have a Stor.E Canvio Toshiba 500Gb external NTFS hard drive. It was working fine like ten minutes ago and now all my files have been replaced by a folder named "found.000" that I cannot open. I tried to retrieve my data using the software mackeeper but it says the disk cannot be read and run Testdisk to try to fix it or retrieve my data but I do not know how to use Testdisk very well.

The TestDisk analysis shows this :

Disk /dev/rdisk2 - 500 GB / 465 GiB - 976773168 sectors (RO)
Current partition structure:
Partition Start End Size in sectors

Warning: number of heads/cylinder mismatches 255 (NTFS) != 1 (HD)
Warning: number of sectors per track mismatches 63 (NTFS) != 1 (HD)
1 P HPFS - NTFS 2048 976771119 976769072 [TOSHIBA EXT]

Warning: Bad starting sector (CHS and LBA don't match)
No partition is bootable
0 D FAT32 715093261 1896786745 1181693485
FAT32 715093261 1896786745 1181693485
check_FAT: can't read FAT boot sector
Invalid FAT boot sector
0 D FAT16 LBA 2125262773 5909813675 3784550903
FAT16 LBA 2125262773 5909813675 3784550903
check_FAT: can't read FAT boot sector
Invalid FAT boot sector
0 D FAT32 LBA 1365415759 2816414404 1450998646
FAT32 LBA 1365415759 2816414404 1450998646
check_FAT: can't read FAT boot sector
Invalid FAT boot sector
0 D FAT12 2873871126 2963834879 89963754
FAT12 2873871126 2963834879 89963754


Can I fix it and retrieve my files?.