efi or gpt partition?

[robina_80]

i have a client who has a ext hard drive but when i plug it in a windows xp x86 it comes up as gpt partition but when i plug it in a windows 7 x64 it comes up as gpt partition, my question is i can see the hard drive in disk management but i cant open it, any ideas

 

[Wolfeymole]

Can you offer a screenshot of Disk Management please Robina.

 

[robina_80]

its all been sorted, the client downloaded mac drive to her pc which can access the file format