Recently I’ve had to bring to work a Flash Drive I normally keep permanently installed at home. To keep the personal files separate from purely business I created a folder I named Holder. I then moved every private file and their folders into it. On the base of the Flash Drive I then had the Business Only files as well as Holder. But when I plugged the Flash Drive into a Windows machine I not only saw the several Business Only files and Holder, I saw several private files that started with “._”. File HBAR524.txt might, for example, would be have a twin named ._HBAR524.txt. In fact I saw several files I thought I had long deleted. This was embarrassing. I regularly delete trashed files, but here they were on a Dell using Windows 7. I could see dozens of private files. Of course I then re-deleted the many files I had long thought were deleted. You could see many normally hidden/invisible files with Windows but were hidden with Snow Leopard. What was going on? And another thing: When I plugged the Flash Drive back in at home and went back to my normal setup I suddenly found had double the picture files I rotate as Wallpaper. Every wallpaper picture suddenly had a twin: Wallpaper.101.JPG suddenly had ._Wallpaper.101.jpg. Then the system wanted to use the new files instead of what was normally setup. 300+ empty files were being tasked for displaying a wallpaper picture. In the end I deleted the corrupt wallpaper folder and used backup pictures to replace it. When I was using my Dearly Departed Apple ][ GS I had an option to see directory information files that were normally hidden. All of a sudden I’m finding hundreds of files that are normally hidden under 10.5 and 10.6. What I think is happening is that Temp files are not being properly deleted even though I usually use Secure Delete. Now I understand the need for Temp files, what I DO NOT understand is why they aren’t being deleted or why I cannot see them. I can see them very plainly in Windows. Why are these "deleted" Temp files showing up on Windows and not Snow Leopard? Why weren’t these files deleted in the first place? Why do I find, when copying files from one drive to another drive, these ._(Blank)Files (?) as well as their original Files are copied? Why can’t just the original Files be copied?