That's because the encoding of C,H,S used in the MBR maxes out at approximately 8GB. Note: I say that CHS addressing shouldn't apply. So how about looking at sector 56 and see if it contains the expected secondary boot sector? You bad drive has a partition starting at sector 56. and it's interesting to me that the "good" drive has a boot partition starting at sector 63 - which is very much the standard value from the XP era (more modern OS would use something like sector 2048). What's more important is to look at the first sector of the boot partition volume. Note that I said that the error means that a boot sector was found at sector 0, so you are not showing the important sector - we already knew that sector 0 was good. The fictional geometry is something that VirtualBox will write into the header at some point after a successful boot. Both the "good" and "bad" disks are larger than 8GB, so CHS addressing SHOULDN'T apply (see note below), only LBA addressing. I don't believe the disk geometry is significant.
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