How to convert MBR to GPT without data loss?

Question

Hard disks

How to convert MBR to GPT without data loss?
I only found how to make it from under Linux, but I'm not entirely sure that without data loss: howto-press.blogspot.ru/2012/08/mbr-gpt_6.html
There is a 2TB hard drive. It has 2 partitions, 1-ntfs, 2-hfs+.
It is necessary to convert MBR to GPT so that one of the partitions (which is hfs+) will work well in Mac OS X to create a Fusion Drive.
Available Windows 8.1 and Mac Os X 10.9.5.
There is no free flash drive for Linux. DVD drive too.

Answer 1

You need something low-level, capable of working only with the partition table, moreover, with addressing by sectors, not megabytes. Under mac for certain there is something.
The trick is:
deleting and adding partitions changes information only in the GPT or MBR tables and does not touch the rest of the disk at all.
if you delete the partition, then create a new one with the same initial and final LBA sectors, then neither the FS nor the data will notice at all that something has changed.
GPT occupies 40 sectors at the beginning and at the end of the disk
MBR - 63 at the beginning of the disk.
Therefore, if after the last partition there are 40 unallocated sectors (if not, you will have to reduce the partition), then:
write on a piece of paper where partitions begin and end,
create a GPT table
create partitions in the same places

Answer 2

Made a gdisk conversion without data loss howto-press.blogspot.com/2012/08/mbr-gpt_6.html