Hello, I have 3 interesting questions concerning MacOs X #1 Why does MacOs X produces ._DS_STORE, ._Trashes , _.901, ._myfileName files on USB Storage Key devices ? What's totaly annoying, is the fact that these files are some time as huge as the original file (eg: ._myFileName.mp3 can have the same size as myFileName.mp3). Is it a bug, a feature ? For me it's not a problem, but when you give your USB Storage Key to a Windows user, they have dozens of this kinda temporary files on the key... Not very user friendly #2 I'm asking myself how the "Plug'n Play" support is made in MacOsX. Does the "Plug'n Play" feature come from the OS or from the chip built in the USB device ? Does it mean that each device has to implement in the chip a kinda "Hello Os, I'm a USB Storage device with the name XYZ, please detect me"? In this case is this the reason why a Pocket Pc isn't directly working with Mac Os X ? #3 To this question I hope i won't have answers such as "it's illegal, you aren't allowed to " because I'm not asking a "How-to" but a "is it possible". Under Windows when installing a demo version say 30 Days trial, we know that althought we have clean up everything on the hard drive, it's impossible to reinstall the app because there are so many registry keys hidden in the registry. My question is simple : does MacOs also have a registry (i far as i know, no) or a hidden file system, or does it mean that if I have cleaned up everything on my hard drive i could THEORETICALLY reinstall the trial version and reset the "counter" ? Thanx a lot for your answers !