Deleting GPT protected Partition

It's time to transfer all my files from Lab's Computer to my New (yes i said new) Seagate Portable Hard Drive. But i am using Microsoft's antique operating system Windows XP which do not allow us to write when the disk has GPT protection. So i had to look through the web to find out how trespass the protected disk. I found some does commands from the blog of Paul Gu.
We actually can convert a GPT disk to MBR by using the clean command in DiskPart, which will remove all data and partition structures from the disk.
The steps we need to follow are as follows:
In  DOS command prompt type “DiskPart” in command line.
c:\ diskpart
you will see
DISKPART>
then type “list disk” 
DISKPART>list disk
then select disk which has GPT protection 
DISKPART>select disk 1
you will see 
disk 1 is selected
DISKPART>
then type "clean" command to remove GPT disk from the current in-focus disk by zeroing sectors.
DISKPART>clean
Go  to Disk Management, Right click on disk info, choose “Initialize Disk”.