What hard disk drive should I have to buy and maximum what gb I can upgrade to mid 2011 21.5 inc mac?

what hard disk drive should I have to buy and maximum what gb I can upgrade to mid 2011 21.5 inc mac? Also do you think I can replace myself at home or I need to take specialist?

Hi, I take it you mean the Optical drive?
If so, here's a few...
http://eshop.macsales.com/shop/optical-drives/superdrives/

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    Message was edited by: Texas Mac Man

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