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.
that means it has been deleted
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.
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
df df - report file system disk space usage du du - estimate file space usage
Almost all Linux installers will allow you to choose which disk is used when one partitions the disk (choose manual to choose which hard drive to use)