1. Right click on the my computer icon in the desktop.
2. Now select 'manage' option from the pop up menu.
3. Computer Management window opens.
4. There in the left panel select the 'storage'.
5. Then select the 'Disk Management'.
6. Then your computer displays the logical drives connected to your PC.
7. Now you can delete or add a partition from a drive.
8. While adding you can specify the size of the particular newly created drive.

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Dear,
Yes partition sizes can set manually by using partition Magic Software
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