PS3 uses proprietary file system. And if you do no have tools that came with your PS3 I afraid there is nothing you can.
Overall damaged files are next to impossible to recover or restore. There are exceptions but not that many.
You might want to call the manufacture and ask for help. Also try to use Google, I have not found any helpful information.
It looks like your hard disk has corrupted file or the hard disk has crashed.
A corrupted file is a file which has been altered or distorted in some unwanted way. This is usually caused by faulty storage media (a failing hard disk or scratched CD for example) or a virus. It can be extremely difficult if not impossible to retrieve data from a corrupted file.
A file system allows the operating system to store and organize files on a hard disk.
Hard drive corruption is typically caused by sudden PC shutdown and connectivity issues, viruses, file system errors, or bad sectors. There are ways to fix a corrupted hard disk, whether an internal or external hard drive.
Sector is the smallest unit on Hard disk identified & addressed by File System.
disk defragmenter
A file system is used to organize a hard drive. This is part of the operating system that deals with how files are written to and read from the disk, and how the disk is organized.
physical file system
Hard disks are same the file systems have many diferences !
Formatting prepares the file system - it writes certain data structures to the disk, which are required to maintain the file system.
It may not be a virus. It could be a faulty hard disk or fault ram or a corrupted operating system
Disk cloning is the copying of the contents of one hard disk to another hard disk. In the alternative, a cloning copy can also be saved as an "image" file; a compressed file containing a "snap shot" of the hard drive's contents.