Floppy disks, both 5 1/4 inch and 3 1/2 inch can easily become scratched, contaminated or magnetically corrupted.
We have specialist hardware that enhances the recovery of data from floppy media. Hardware techniques are also enhanced by mathematical techniques, which improve on the standard error correcting and detecting algorithms.
Typically we do not require high-tech methods to recover floppies. In most cases the file system is corrupt but the data is good. You are, however, in the best "recovery" hands if your floppies need rescuing.