The tear down on the A1302 should be the same as they were only made 6 months apart.
[[Topic:Apple Time Capsule Model A1302]]
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Here's how to change the hard drive out: https://www.ifixit.com/Guide/Apple+Time+Capsule+Model+A1302+Hard+Drive+Replacement/2750
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Here's how to change the hard drive out: [guide|2750]
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You may need to see if it has the Apple priority heat sensor that Apple started using in mid 2009. If so, you can stay with the same brand of drive or probably use the sensor cable for your specific brand, Seagate, Hitachi and Western digital that were used in the iMacs.