I think this is more oriented to Windows, but the various articles will still have information that applies to a Mac Tweakers Page
Internal Sata drives are best, but if you have a USB3 or eSata connection you may use an external drive
External eSata or USB3 are both fast enough for video editing... (or Firewire?) http://forums.adobe.com/thread/1117813 - http://ppbm7.com/index.php/tweakers-page/84-disk-setup
A possibility is this USB3 dock with fan to swap drives http://www.amazon.com/StarTech-SuperSpeed-Docking-Station-Cooling/dp/B0055PL2YI or http://www.newegg.com/Product/Product.aspx?Item=N82E16820147511
And, some comparison tests http://forums.adobe.com/thread/1144620
You might want to consider upgrading that fusion drive to a SSD last time I checked it was a lousy 5400 rpm drive with a hybrid SSD front end.
Your iMac has four USB3 ports. Rather than any hard drive configuration consider the Samsung T3 SSD which is available up to 2TB on one of those ports and get performance 2 to 3 times faster than hard drives. Here is the performance on my PC laptop of my 500GB T1 which was the previous generation.
I comfortably edit on my quad-core i7 laptop with 24 GB of RAM and a good SSD for the OS/Applications and all project files on the T1. No need for multiple drive confusion. Side advantage is the very simple project portability
Bill, are you suggesting the OP change his Fusion drive on his iMac? I bought my first iMac two weeks ago with the understanding the drive is in it to stay. That being said, I'm sure someone has figured out how to change the system drive, but if that is the case won't it void the warranty?
I edit AVCHD projects in PPro CC 2015 on my Mac Pro 3,1 and am looking for "the best" drive configuration possible on my new Late 2015 27" iMac 3.3 GHz Fusion 2TB AMD M395. On my Mac Pro 3,1 I have four internal Mercury 3G drives (apps/OS, Project media, cache & exports, and backup).
Are you able to elaborate on changing an iMac Fusion drive, and advise a external drive solution should I not want to/be able to crack open my new iMac, please? Thanks.
From the Apple iMac page it leads me to believe that you should be able to take into a store for them to upgrade to an SSD
1TB (5400-rpm) hard drive
Configurable to 1TB Fusion Drive or 256GB SSD
1TB (5400-rpm) hard drive
Configurable to 1TB Fusion Drive or 256GB or 512GB SSD
1TB Fusion Drive
Configurable to 256GB, 512GB, or 1TB SSD
I just googled "upgrade imac fusion drive to ssd" and there are many options.
If you want just to add a portable USB 3 drive to use for your project and media files get the Samsung T3 that I referenced above. It can be formatted for OSX