ok so i have this Maxtor one touch III external hard drive that i used to use with my XP computer a few years ago... its 500 GB. so i plug it in to my Mac and install the software and it doesn't show up on my desktop or my disk utility. although, it does show up in my system profiler. so, it didn't work for mac... then i went onto my parallels account that has windows 7 on it and it still doesn't show up. what can i do to fix this?