Transferring from PC to Mac several years ago when Ronald's PC blue screened and we lost everything on the hard drive probably cost me a lot of photos - I don't even want to think about it. Since then when we do use PCs we keep two copies of everything on external drives.
I've been digging around for some of my favorite photos and finding that I can't find them!!! Fortunately some of them are up on kodak.com (used to be ofoto.com), but now I have to pay a membership fee to download them in their original state. Also Ronald was able to download all the photos from my original photography website and so at least I have them.
But the Mac is so friendly there won't be any photos on a PC around here anyway!