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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
This commit is contained in:
Pete Batard 2020-04-13 17:05:33 +01:00
parent 129aa64394
commit 2dd538b7cb
No known key found for this signature in database
GPG key ID: 38E0CF5E69EDD671
9 changed files with 60 additions and 57 deletions
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65
src/ms-sys/inc/mbr_msg_rufus.h
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@ -1,6 +1,6 @@
/*
* Rufus message MBR - Displays an ASCII text message contained in the
* next 4 KB of sectors that follow.
* 4 KB of sectors starting at LBA 34 (i.e. after the primary GPT if any).
* See https://github.com/pbatard/rufus/tree/master/res/mbr
* Copyright © 2019-2020 Pete Batard <pete@akeo.ie>
*/
@ -11,36 +11,35 @@ unsigned char mbr_msg_rufus_0x0[] = {
0x89, 0x07, 0xC1, 0xE0, 0x06, 0x8E, 0xC0, 0xB7, 0x07, 0xB8, 0x7F, 0x00,
0xCD, 0x10, 0x31, 0xDB, 0x31, 0xC9, 0xBA, 0x4F, 0x18, 0xB8, 0x00, 0x06,
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};