Re size a Partition for Free in Windows Vista
Windows Vista
includes a built-in functionality in Disk
Management to shrink and
expand
partitions. No more 3rd party utilities
needed!

To
get to this utility, open up Control Panel, and type in
partition into
the
search box.. you’ll immediately see the link show up:

Shrink a Partition
In the Disk Management screen, just
right-click on the partition that you want to shrink, and select “Shrink
Volume”
from the menu.
In the Shrink dialog, you will want to enter
the
amount you
want to shrink by, not the new size. For example, if you
want to
shrink your
50gb partition by roughly 10gb so that it will now be
roughly
40gb,
enter 10000
into the box:

Extend a Partition
In the Disk Management screen,
just right-click on the partition that you want to shrink, and select
“Extend
Volume” from the menu.

On this screen, you can specify the amount that you want to
increase the partition by. In this case, I’m going to extend it back to the
roughly 50GB size that it was before.
Note that the extend partition
feature
only works with contiguous space. [HowToGeek]