Unrecoverable message when using free Recuva

I just accidentally deleted from my Sandisk SD card about 120 pictures that I intended to copy first to my hard drive. I installed the free Recuva, went through the guided steps but ended up with it finding photos that say unrecoverable. Rather than the typical IMG_#### that they are usually styled, they have only MG_####. It found over 400 photos, but they say unrecoverable. Any ideas of what else I can try? Please??

Your card is most likely FAT32 and when a file is deleted the first character of the file name is altered to x'E5' which is non-displayable, and the first two bytes of the file address are set to zero, Regarding the latter Recuva is probably looking in the wrong place for the files. That also explains the unrecoverable message. A deep scan might help.