1. Right click on the drive from where you want to distribute the size.
2. Click on 'Properties'.
3. Click on "Quota".
4. Enable the 'Quota Management' checkbox and 'Deny disk space to users exceeding Qota limit' checkbox.
5. Click on "limit disk space to" radio button.
6. Specify the disk space and the warning label.
7. If you want to define the different spaces to the different users then click on 'Quota Entries' button.
8. From 'Quota' menu, choose 'New Quota Entry'.
9. Click on 'Advanced'.
10. Click on 'Find Now'.
11. Select the users.
12. Click on OK / OK.
13. Click on 'Limit disk space to'.
14. Specify the disk space and the warning label.
15. Click on OK.
16. From 'Quota' Choose 'Exit'.
17. Click on 'Apply' / OK.