The first 96 bytes may not be zeroes. It can contain trivial boot
code that merely emits an error and waits for a key press before
rebooting. The error being that extended partitions are not
bootable. The origin is presumed to be Windows 2000; Windows XP
does not do this...
For now, ignore the first 96 bytes when checking that the EBR is
(for the most part) all zeroes.
Tested by: Mario Lobo <mlobo at digiart.art.br>
Dieter <dieterbsd at engineer.com>
PR: kern/141235
Reviewed by: marcel
Approved by: kib (mentor)
Approved by: re (bz)
00e4466ce9