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Current version by Dan,

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Yes you can upgrade the HD to a 4 TB disk [guide|5954|IFIXIT HD replacement guide]
 
But you do have an issue here that you may need to deal with depending on the HD you put in. This is the first generation of systems that Apple started using the internal thermal sensors of the drives (using modified HD firmwarefirmware via the power connector).
But you do have an issue here that you may need to deal with depending on the HD you put in. This is the first generation of systems that Apple started using the internal thermal sensors of the drives (using modified HD firmwarefirmware via the power connector).
 
Depending on the HD you get you may need to either apply some software to over-ride the systems cooling system or splice in an external sensor (B&W wires) to the power harness cable. So the fans don't run wild as the HD sensor input would be missing. Some of the newest drives now work correctly without any add-on software or modifications.
 
Another option here is to add-in a second, yes I did say second HD using the [guide|6434|IFIXIT 2nd drive kit]. While you'll need to use the smaller laptop type of HD you won't need to deal with the thermal sensor. Or it you really want some speed you could put in a SSD here while you have it opened up.

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Original post by Dan,

Text:

Yes you can upgrade the HD to a 4 TB disk [guide|5954|IFIXIT HD replacement guide]<br /> <br /> But you do have an issue here that you may need to deal with depending on the HD you put in. This is the first generation of systems that Apple started using the internal thermal sensors of the drives (using modified HD firmware).<br /> <br /> Depending on the HD you get you may need to either apply some software to over-ride the systems cooling system or splice in an external sensor (B&W wires) to the power harness cable. So the fans don't run wild as the HD sensor input would be missing. Some of the newest drives now work correctly without any add-on software or modifications.<br /> <br /> Another option here is to add-in a second, yes I did say second HD using the [guide|6434|IFIXIT 2nd drive kit]. While you'll need to use the smaller laptop type of HD you won't need to deal with the thermal sensor. Or it you really want some speed you could put in a SSD here while you have it opened up.

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open