Found over 4000 deleted files on a hard drive I used it on. Let's you preview them to decide whether you wish to undelete or not.

If you don't already have such a program, download this.

Bit pricey, imo.

@TK I didn't forget to mention it, I just did not say so. You can't go through life expecting everything to be free. If it works and you're desperate, as I really was, you will be only too glad to keep executing the app if it gets your files back. With this demo, however, it doesn't expire so you can keep using it (out of fairness I recommend you should buy it if it works for you as it did for me).

I tried EasyFileUndelete and found it took ages to complete. I don't mind that quite so much if it is effective but it wasn't. It missed some files. I would only rate it mediocre. Perhaps I'm being unfair but I didn't have enough time to try it out properly before expiry deadline.

I installed Munsoft File Undelete Ver3-0. Had it a long time since 2013. No complaints.
Back to Life is interesting but costs USD$25.
Much liked SpinRite Version 6.0 costs USD$89.
If you want recovery freeware, then it matters who you listen to for recommendations.
So far I have found these to be reliable gurus who know what they are talking about.
Dottech (Ashraf)
LifeHacker
Gizmo
TechRadar

http://dottech.org/113185/windows-review-best-free-file-data-recovery-programs/

http://lifehacker.com/5237503/five-best-free-data-recovery-tools

http://www.techradar.com/sg/news/software/applications/best-free-recovery-software-1141256

http://www.techsupportalert.com/best-free-data-recovery-file-undelete-utility.htm

I was able to install this software on Win 10 Pro and register it without problem. I ran a deep scan on a 1 terabyte drive that had been formatted and was being used in two partitions which were 15% filled with new data. The program reported a wealth of MBR, old data, trash can deletes and etc. The process took 3 hours at 4.2 G-hz quad core and in the end trying to restore many of the data outside of the trash dump failed. Other offerings here were quit a bit more successful on this same drive!

Thanks for the experiment!

@whammo
You may be right about run of the mill software having a poor recovery record but it doesn't necessarily follow that expensive software will deliver the goods either. I bought one expensive piece of software as I was desperate to recover some data and mistakenly thought that as it was expensive it would have the ability to solve my recovery problems. It didn't. I had tried numerous other apps but in vain and none of them would let me even access the drive. By chance I came across Back2Life from www.grandutils.com and gave it a go and to my surprise it did access the drive and recovered every item I was interested in. I'm not naive enough to expect software to recover all lost files as that is often impossible to due system overwrites especially if disk space is low. Try Back2Life sometime as it also has a preview function and can tell you the recovered file starting cluster and the number of clusters the file has. For some this can be quite useful information. The support was excellent with my query resolved within hours, something quite unusual these days.

PS I have no links to www.grandutils.com other than being a satisfied user

Found zero files.
Re-tried same micro-SD with Puran File Recovery - found loads and reported EXCELLENT (recovery chance for many - showing preview) and POOR for others but still showed contents in preview. Proof is in the pudding. Re-ran Easy File Undelete several times with every setting I could - always said no deleted files found. Might need a PC re-load - I don't have time. I did try closing program and re-opening. Same result - nothing. Tried FAST search and COMPLETE search. File system FAT32. 32GB