questionscan you use an external hdd on the zmodo system…

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I don't know which one you're referring to, but I haven't seen any zmodo dvrs that allow this. Unless, of course, you're able to crack open the external hard drive case and it's just a standard hard drive. In that case, you can just install it inside the zmodo dvr box and format it to be used as a normal HD.

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Official answer from Zmodo (found copying and pasting your question into Google), is no.

http://kb.zmodo.com/index.php?action=artikel&cat=1&id=59&artlang=en