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[xboxmods2977]

Why would you want to remove a modchip in favor of a softmod??  
That is almost sacrilege.

Your modchip does not determine the size limit of HD you can put in your xbox. The bios on the chip does.
Furthermore, your xbox HD upgrade task will be much easier with the chip left installed.

I am not that familiar with the apple x but a quick google search turned up that it (AppleX VI Pro) has 2 256k sized banks. So to be sure, you could just flash the latest iND bios to one of the banks and be done.

Then, it would be just a matter of installing the new HD into the xbox, booting up unleashx from a cd/dvd and formatting the new drive. Done.

Then put on the finishing touch by formatting your F partition with xbpartitioner and then FTP xbmc to the new drive.

That's it.

As a side note, you do not need to dump the eeprom for an HD upgrade if you have a modchip installed, tho it is good to do so in case the modchip ever dies, it is not required.