Mac Data Recovery Guru has a “Search for embedded files” option that will make it do an exhaustive search for every file type it can recover starting from every byte on the drive, instead just searching for files starting at a block boundary. This is for use by digital forensics professionals.
macOS: HFS, HFS+, HFSX
Microsoft: NTFS, FAT
Linux: Ext2, Ext3, Ext4, XFS, UFS
Simon Jary (12 March 2012). "Mac Data Recovery Guru 2.0 review". http://www.pcadvisor.co.uk/reviews/software/3414283/mac-data-recovery-guru-20-review/ ↩
Cliff Joseph (12 October 2012). "A handy utility for recovering deleted files or files on damaged drives". http://www.macworld.co.uk/review/utilities/mac-data-recovery-guru-review-3415535/ ↩
Derek Schauland (7 May 2012). "Data Recovery Guru helps your Mac recover lost files". https://www.techrepublic.com/blog/apple-in-the-enterprise/data-recovery-guru-helps-your-mac-recover-lost-files/ ↩