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How to convert a FAT32 & HFS partition to a GPT partition?

Is there any freeware / tool running on Win XP that could convert an FAT32
& a HFS partition to a GPT (Global Partition Table) filesystem?  Pls provide
 the link / url.

Reason is I formatted my external USB HDD to a mix of
FAT32 & HFS partition to take "Disk Utility" backup but it
complained the destination (ie the USB HDD) is not a
GPT.
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Thanks chaps; why didn't I think of doing it on the Macbook.

The Macbook belongs to my kid & I never get to use the Macbook
& I'm a dummy when it comes to Apple products.

  I only uses Windows laptops.
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ASKER

Need more help:

From the Macbook (Retina model) Disk Utility, when I select
the HFS or FAT partitions & then click "Erase" tab,
followed by "Format: " field, it only give options 1, 2, 5, 6 :

1. Mac OS Extended (journaled)
2. Mac OS Extended (journaled, Encrypted)
3. Mac OS Extended (Case-sensitive, journaled)
4. Mac OS Extended (Case-sensitive, journaled, Encrypted)
5. MS-DOS (FAT) : I suppose this is FAT32 ?
6. Ex-FAT

When I select the entire USB HDD, it gave all the above
6 options.  However, I don't see any GPT (or GUID Partition
Table) ?  Am I missing something?

I recall I've seen it in Win 2008 Enterprise R2
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Ok, tried that & under Options button, there's GUID.
However, when I click "Apply" it says the entire USB
HDD (ie all the four partitions) will be erased.

is there anyway to convert only one partition to GPT
/GUID without affecting the remaining 3 partitions?
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ASKER

ie have a mix of GPT partition as well as Mac OSX HFS as well
as FAT32 partitions on that USB HDD
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gptgen is great & free as well.

Care to share with me the exact syntax & some examples on how
to use gptgen as it's rather cryptic.  After that I'll close this thread

D:\gpt\gptgen-1.1>gptgen.exe
gptgen.exe: Partition table converter v1.1

Usage: gptgen.exe [<arguments>] <device_path>
where device_path is the full path to the device file,
e.g.\\.\physicaldrive0.

Available arguments (no "-wm"-style argument combining support):
-b <file>, --backup <file>: write a backup of the original MBR to <file>
-c nnn, --count nnn: build a GPT containing nnn entries (default=128)
-h, --help, --usage: display this help message
-k, --keep-going: don't ask user if a boot partition is found
-m, --keepmbr: keep the existing MBR, don't write a protective MBR
-w, --write: write directly to the disk, not to separate files
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On my Win XP Professional laptop (32 bit), I don't see the USB
HDD (which is currently in GPT format).

But on a Win 2008 Enterprise R2, I saw it:

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          298 GB   228 GB
  Disk 1    Online          931 GB   508 MB        *

DISKPART> select disk 1
Disk 1 is now the selected disk.
DISKPARt> exit

Somehow, still run into difficulties:

C:\gptgen11\gptgen-1.1>gptgen.exe \\.\physicaldrive2
gptgen.exe: Partition table converter v1.1

Unable to auto-determine the block size of the disk.
Please enter the the block size by hand to continue.
>quit
Block read failed, check permissions!

Next I try with physicaldrive1 :

C:\gptgen11\gptgen-1.1>gptgen.exe \\.\physicaldrive1
gptgen.exe: Partition table converter v1.1

Not enough space at the beginning of the disk (need at least34 sectors before
the start of the first partition).
Re-partition the disk to meet this requirement, and run this utility again.

Not enough space at the end of the disk (need at least
33 sectors afterthe end of the last partition).
Re-partition the disk to meet this requirement, and run this utility again.

C:\gptgen11\gptgen-1.1>
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