On 2016-12-08 16:39 , David J Brooks wrote:
oh another question. Am i getting into any troubel if i go more then 2TB for the drive, say a 3 or 4. its an older computer, 2011 iMac 21.5" with OS 10.11.6
8 petabytes (8000 TB) is the biggest drive OS X can handle; some cheap old USB cases can only support up to 2 TB drives, but good USB 2 and probably all USB 3 chipsets can theoretically handle 8 zettabyte drives (8,000,000 TB), if you can find an OS that can handle them
with your Mac, you can use the Thunderbolt-to-USB 3 adapters Larry spoke of ($70-80) and get a big advantage in transfer speed with (USB 3) external drives — it won't make a difference if copying directly from your CD/DVD drive, but it will make a difference for use with Lightroom, etc.
if you are using the drives as a deep archive and rarely intend to access them, 5400 rpm/USB 2 is fine, otherwise 7200 rpm/USB 3 would be substantially faster
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