It is the second time (since a long time ago) i try on my computer to create a small partition, using the default windows 10 disk management tool. First step is to shrink my C drive, and windows asks me how much i want to shrink it: i put the bare minimum, i.e. 1 MB only. Again, as the first time i tried it long ago, after the process the disk management only shows the original C partition, with 1 MB less of space available, but there is no trace of the new small partition it should have been created. I also ran Partition Magic in order to recover lost partitions, but it did not find anything. I really do not know why this happens, and how to get back my lost space. Thank you for your help!
edit:As answerers said, that unallocated space was to small to even show up. I then proceeded to shrink my C: drive again, this time by 548 MB, and now i finally see again those 2 "lost" MB in the unallocated section. Cool, but when i try to extend my C: volume back to what it was at the beginning, the maximum amount allowed it 548 MB, not 550. It seems like i cannot touch those 2 MB, even if they are actually showing up now. Pic: dropbox.com/s/sm4qrgpos1vcg0d/Senzanome.png?dl=0