Finding files in external hard drive
I have sometimes been able to find files in my external hard drive, but mostly not, to the point where I have to wonder whether having one is worthwhile. The situation might even be worse than I know, since I've only looked for certain E-mail messages and images/photos in iPhoto. Anyway, I've decided to try again. Before I do, I'd like to know: (1) E-mail messages: are they stored throughout the external hard drive, or is there an E-mail section where all E-mail messages are kept? If they are scattered throughout the EHD, is there a way to consolidate them? (2) Moving files by dragging. Are there disadvantages to moving files this way rather than by highlighting and clicking? I may be wrong, but it seems to me that dragged files do not become consolidated with other files of their kind. They exist separately. Is this correct?
Where can I find a good guide for using an external hard drive, no, make that, to find and retrieve files from external hard drives?
iMac (27-inch Late 2009)