When opening Recuva 1.51.1063, the program scans for my old floppy drive (drive A on my setup), which makes that annoying grind-type sound since there is no floppy disk in that drive.
What is worse is that when I try overwriting some of the files that are found on my hard drive (drive C on my setup), the program keeps scanning to the floppy drive. I am not sure if it is looking for updated files on all drives (only drive C was selected), but that grinding sound is extremely annoying.
I have a similar issue with CCleaner when clearing free space, but it only does that when I first click on the Drive Wiper button. I did not have this problem with Recuva or CCleaner until a few versions ago.