I have a 13 inch Mid 2012 MacBook Pro and I want to connect my LaCie Thunderbolt hard drive and my extra 21" Monitor but the MacBook Pro has only one thunderbolt port...
How it will be possible?
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If either your LaCie Thunderbolt Drive offers more than one Thunderbolt port ([https://www.lacie.com/se/products/product.htm?id=10621](like this one)), or you have a native Thunderbolt display, you can "daisy-chain" them:
If none of your Thunderbolt devices support daisy-chaining (i.e. don't offer a second TB port), then you would need a Thunderbolt Hub.
Another possibility would be to connect the hard drive via USB, if it can, [https://www.lacie.com/se/products/product.htm?id=10599](like this one).
One caveat though: this should work for any thunderbolt display. If you want to use the DisplayPort adapter, you should check whether it works when it is not connected directly to your Mac.