It's hard to tell what the cause is for the corrupted files. If they have part of them overwritten, or if it's just a question of a fragmented disk where the repair program don't know where the file continues.
In some situations, the data recovery company may be able to retrieve partial file chains and merge them together - this depends a bit on how well they understand the file format for doing the pattern matching.
MT Stringer wrote in post #12589304
Maybe you should ask the dufus that caused this mess how deep his pockets are?

What help would that be? This is not a one-man error. It was wrong to ass-u-me that the photos had already been copied to another disk. But the main problem here was the lack of backup.
All we can hope, is that lots of people do read this thread and take note of it and go out and buy the required media to backup their files.
- A backup is not a copy to one other media. The files should be copied to at least two other media, so if the main media or one of the backup medias fails, the data is still stored on at least two media.
- A backup is not a write and forget - the backup media must be regularly tested to verify that the contents can be read back correctly.
- A backup is not a single-site storage. Fire or burglary requires that backups are stored at at least two separate addresses.
- A backup is not unordered copying. Backup volumes can quickly become so large that the cost of sorting through the backups can be unmanageable. There must be some acceptable form of indexing of the backup contents to allow specific content to be easily located.