Transferring data from one external drive to another

HI,
I want to get a new external hard drive and transfer all of the data from my old one - which is not full, but has started to click and operate slowly. The old external hard drive is where I keep the music files for my itunes library, as well as all my personal files. I run all software on my iMac, OS 10.6.8 (i.e. the itunes Library files are on the imac's internal hard drive - the music files themselves are on the external).
Is there a link or a manual that someone can point me towards to perform this operation smoothly?
Much appreciated,
Scott

Make sure the new drive is formatted Mac OS extended. You don't need to do anything fancy with erasing or partitioning.
Kappy's brief drive formatting instructions (12/2012) - https://discussions.apple.com/message/20571091#20571091
BDAqua's Formatting instructions - http://discussions.apple.com/message/8901255
Pondini: Formatting, Partitioning, Verifying, and Repairing Disks... - http://pondini.org/OSX/Home.html, specifically http://pondini.org/OSX/DU1.html
Drag all the contents of one drive to the other. This make take some time and you may wish to break it up into groups of folders.
Once you have the iTunes folder on the new drive you will encounter a problem because you decided to keep your library files on the internal drive and your media files on the external drive (not normally recommended unless you have specific reason for not keeping them all in the iTunes folder in one place). Unless you give the new drive exactly the same name and folder structure as far as iTunes is concerned you will end up with broken links for all your tracks because iTunes will look for them on the old drive. If you keep iTunes's normal preferences for managing media but have simply redirected it to use an external drive, change the preferences in iTunes so it is now pointing to the media folder on the new drive.
Hold on, you aren't done yet. Your links are still broken. Click on a track. When iTunes asks you to find it, look for the particular file in your media folder on the new drive. Hopefully iTunes will ask if you want to find others too and will do so automatically (be patient).

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I'm going a little bit crazy trying to figure this out to be honest.
If all you read is the next paragraph that's fine, it's what I want to do. The rest is an explanation of what I've tried already, thanks:
*Here is my situation. I want currently have ~90GB of music on an 3.5" external USB drive. I now have a larger capacity 2.5" portable hard drive that I want to keep my music on so I can carry it with me anywhere. I also want to maintain playlists and play counts, etc. Seems like it should be easy, not.. haha.*
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Transferring data from one external drive to another

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