=====Convert MBR -> GPT=====
[[http://sourceforge.net/projects/gptgen/|gptgen]]. \\
Usage example: [[http://bramp.net/blog/2010/08/converting-mbr-to-gpt-without-deleting-your-partitions/|bramp.net - Converting MBR to GPT without deleting your partitions]]

In short: 
  - BACKUP YOUR DATA!
  - Determine the number of the disk with Disk Management (diskmgmt.msc). (Disk1 is used in the examples below.)
  - Use gptgen without the -w parameter (dryrun), but with the \\.\\physicaldriveX parameter (where X is the disk number):<code>gptgen.exe \\.\\physicaldrive1</code> Sample output: <file>gptgen.exe: Partition table converter v1.1

Boot: 0, Type: 0x7, Start: sector 2048, Length: 4093634560 sectors

Writing primary GPT and protective MBR to primary.img...
Writing secondary GPT to secondary.img...
Success!
Write primary.img to LBA address 0.
Write secondary.img to LBA address 4093640671.
</file> 
  - This will have created a primary.img and secondary.img in the working directory both containing what gptgen.exe would have written to disk when provided with the -w parameter. Determine the size of primary.img and secondary.img:<code>dir *.img</code><file>28-07-2012 10:44 17.408 primary.img
28-07-2012 10:44 16.896 secondary.img
</file>
  - Calculate the count= value needed for dd.exe for each .img. In this example:
    - primary.img: 17408 / 512 = 34
    - secondary.img: 16896 / 512 = 33
  - Create a backup with dd.exe of the disk locations that will be overwritten by gptgen.exe. You can get the value for skip= from the gptgen output line: <file>Write secondary.img to LBA address 4093640671.
</file><code>dd if=\\.\\physicaldrive1 of=primary-backup.img bs=512 count=34
dd if=\\.\\physicaldrive1 of=secondary-backup.img bs=512 count=33 skip=4093640671
</code>
  - Use gptgen with -w parameter to write the changes to disk:<code>gptgen.exe -w \\.\\physicaldrive1</code>
  - If all went well: rescan disks with Disk Management (diskmgmt.msc).
  - Done.

If something went wrong, you can try to write the backup .img files back to the disk with the if= and of= values switched and seek= instead of skip=:
<code>
dd if=primary-backup.img   of=\\.\\physicaldrive1 bs=512 count=34
dd if=secondary-backup.img of=\\.\\physicaldrive1 bs=512 count=33 seek=4093640671
</code>