Iihave two questions. First, can i delete all "apk" files or are some needed? I have an SD manager and it is supposed to delete all "apk" and other trash files and folders. It tells me that my SD is clean but i still have some "apk". Are these ok, or can i delete them? Second, what is the folder labled "DCIM" dedicated to. It is full of my gallery thumbs. Is that what this folder is dedicated to? Any help is apreciated.