How can I transfer my entire Hard drive data to another hard drive bay on a Mac Pro?

I have a Mac Pro with 3 different hard drives. Is it as simple as just clicking and dragging all of the files from the default HD? I would like to use my larger HD for my main hard drive to boot/startup on, how can I transfer everything on HD1 to HD3 and make it startup on it?

Thanks in advance for any help!

Mac Pro best answer:

Answer by The Future is Fusion
if a mac’s file organizer works anything like a windows PC, then you’ll have to copy the entire hard drive by clicking copy on the icon, not dragging the files
this is due to hidden files taking up about 15GB or so on the drive, those things you cant just drag and drop

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