I've been backing up my HDDs using disk utility (creating images from drives). everythings been going great for a year. however, ive hit a snag. my 2 drives data drives (formatted as MacOS Journaled) mount fine on my macbook pro, but both of my backups of my main osx (10.7) drive will not mount. i get the error "no mountable file systems". how the hell is it that they are both bad? how do i fix it so i can mount one? i know the files are good, there must just be some minor issue--and i really need these files. ive read that using repair from disk utility can work. this does not work. should i try diskwarrior? ive heard this only works some of the time.