To start off,

The 1TB is probably a desktop disk..

Where the 80 GB is a laptop disk... Laptop disks are smaller in size but they are better prepaired for external shocks and the like

At the time when the hardware of the Audya was designed, 80 GB was probably a medium size laptop HD...


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If hardware producers want to overcome this problem, they need to create instruments based on Intel PC archtectue.