2 questions re diagnosing/replacing clicking hard drive

2 questions re diagnosing/replacing clicking hard drive

The 30gb HD on my 5th Gen iPod classic started quietly clicking and now it will not connect , etc. It only shows the apple logo, no menus or folders. I've attempted resetting it, low level formats, 'slapping' it, diagnostics menu, etc. No luck. I have no concerns attempting repairs myself. Q1. How do I determine if it is the HD vs the controller board? Q2. Can I replace the 30gb drive with a 80gb drive to increase storage space?

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