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[core] fix MBR protective message overwriting the primary GPT

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* We distractedly chose to populate the message from our protective MBR
  for GPT/UEFI-only boot media into the 4KB that directly followed the
  MBR, which of course is space that is being used by the primary GPT.
* This resulted on systems having to fall back to using the secondary
  GPT, which not all appear to be designed to do.
* Alter the code to ensure the protective message is written at LBA 34,
  after the primary GPT.
* Closes #1507
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Pete Batard 2020-04-13 17:05:33 +01:00
parent 129aa64394
commit 2dd538b7cb
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9 changed files with 60 additions and 57 deletions
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res/mbr/readme.txt
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@ -15,7 +15,8 @@ the partition table lists the disk ID for the first partition as 0x81, then it
will be swapped for 0x80.
An additional MBR (msg.S) also exists in this directory, that can be used to
display an ASCII message contained in the sectors directly following the MBR.
display an ASCII message contained in the sectors following the primary GPT
(LBA sectors 34 and later).
This can be used, for instance, to display a notice for media that cannot be
booted in BIOS/Legacy mode.