Iswhatitis
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It is possible to upgrade the original drive and also add a second drive to an iMac, but it's not for the faint-hearted (see guide below). By going internal you may gain a little speed too - up to 550MB/s (externals tend to be slower).I have an iMac with no ability to add an internal drive beyond the original boot drive it came with.
...The only SSD drive I've ever had fail was an OWC Mercury Extreme Pro 6G.