QUOTE(Bomb Bloke @ Jun 2 2010, 03:38 AM)

Never been entirely sure whether error 16 overides faulty-HDD-type errors. I assume it does
I second this, and will also assume it does. It would seem to me that most xbox bios' shouldn't be able to tell if the clock is set wrong without first running HD checks (error 7) and then checking lock status (error 5 and 6) on the drive, and in fact, accessing contents on a non-unlockable drive isn't possible so why would anyone code a bios to try it?
In conclusion, I say for sure, error 6 overrides error 16 and possibly, error 5. Not sure about error 7.
EDIT:
QUOTE(lordvader129 @ Jun 2 2010, 10:36 PM)

it depends on the bios, an xecuter bios will give 16 in that case instead of 06
This doesn't seem possible to me. How can any xbox bios check the clock on a locked (and non-unlockable) HD?
@spectrumx Check the D0 wire on your solderless adapter to make sure it is making good contact with the DO pad (or it could be touching the wrong pad for your version). Your symptom could indicate this simple fix, and in regards to the hotswap, is sounds to me like the retail kernel is re-locking the drive once error 16 is thrown. If this is the case, you can try the swap before error 16 comes up but that may not work either. The modchip should be your focus.