Changes between Initial Version and Version 1 of Ticket #16, comment 3


Ignore:
Timestamp:
May 30, 2014, 9:19:10 AM (10 years ago)
Author:
Ben Rietbroek

Legend:

Unmodified
Added
Removed
Modified
  • Ticket #16, comment 3

    initial v1  
    1717> Thanks!
    1818[[BR]]
    19 This software stores a copy of the MBR at location 0x7000.
     19Hi T(h)om,
     20
     21Yep, this software stores a copy of the MBR at location 0x7000.
    2022This location is in the middle of AiR-BOOT's Internal Partition Table.
     23(Which is CRC-protected)
    2124
    2225If this software has an option to disable making a backup of the MBR, enabling that
    2326will probably fix the issue. AiR-BOOT also makes a copy of the MBR, so you don't
    2427lose recovery possibilities.
     28
     29If is does not have such an option, then the question is where they make the MBR backup.
     30It could be they modified the win7-loader in the PBR, in which case you can probably
     31disable it by restoring the original win7-loader.
     32
     33To determine if they patched the win7-loader you can do the following:
     34- boot win7
     35- make a backup of track0 with winimage like you did for this ticket
     36- install the software
     37It could be that they already make a copy of the MBR at this point.
     38So make another image of track0 with winimage and see if location 0x7000
     39contains an MBR copy. If so, replace track0 with the image you made before
     40installing the software. This will restore AB.
     41
     42- now reboot
     43AB should work because either it was untouched by the software or
     44you restored it with winimage.
     45
     46- start win7 and when it is loading immediately press hard reset
     47So you need to time this reset to happen just after the win7-loader passed
     48control to the kernel loader.
     49If they patched the win7 loader, AB is now corrupted.
     50
     51This means you can probably solve the issue by restoring the original win7-loader.
     52However, there is a possibility that this software checks for this and reinstalls it's patch.
     53
     54If AB still works, they make the copy of the MBR at some other level, maybe a win7 service
     55you can disable.
    2556
    2657You're lucky this software did not store the copy at the last sector of track0.