how to get data size of a machine in hard disk

Hi All,

I am working with windows 7 migration.

I need to get the hard disk detials of a machine sucah as :

1.how mauch data in hard disk

2.total hard disk capcity

3.users and thier data in the  machien

how to do inventry for geting above details in MAp 8.0

thanks in advance

shinu