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HTC Desire - SD card change

i have htc desire and an 4 gb sd card in it. i would like to change to 8 gb card, but i have a question.
when i connect my phone with an usb to my computer, i select something like "disk drive" and then it opens a window on my computer, actually, like a normal disk drive (like C:, D:...)
what i want to know is, if i would like to move everything from an 4gb sd card to 8 gb card, which files do i have to copy? do i copy all of them or what? because some files have a dot at the beginning of a name (for example ".quickoffice")...do i have to copy even those "dotted" files, or are these files on my phone and not on my sd card?:thinking:
 

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