Highest capacity HD for 2nd drive in MBP?

i'm thinking replacing suerdrive in 13" mid 2011 mbp second hd (already replaced main drive 500gb seagate hybrid). i'd external super drive rare occassions when need dvd or cd accessed.

anyway, largest capacity, reasonably fast hd plug in slot (probably using owc kit)? know of real deals out there? i'd drop in bigger 500gb hold itunes movies , music.

 

2.5" hard drives go 2 tb these days.

 

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