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Resizing OS partition

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I have a 1TB drive in 2 partitions....the OS is 75GB and the data partition is about 865GB. I'm not quite sure the best way to resize. I want to add 25GB to the OS partition and I do see a small, unallocated partition (7MB) at the end of this drive. If I shrink the large partition, it adds it only to the tiny, unallocated partition. So, it looks like I need to append the new, now larger, unallocated space to the OS. But, will that work?
I know of no other way to increase the OS without a total reformat and repartition which I'd rather not do.
Thanks

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Paul:

Before doing any partition operations it is recommended that you back up your data first.

What you want to do is to resize the large partition from the left, leaving 25 GB of unallocated space between the two partitions. Next, resize the OS partition from the right until it includes all of the unallocated space.

These two operations should be done from the boot CD while Windows is shut down.

Much thanks Mark. Just a little confused with where my partitions are located. Here's what my drive looks like.

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You would need to do get the unallocated space between the two partitions. This can be done by resizing the D: partition. For example, right-click on D:, select Resize volume, place the mouse cursor over the partition graphic, then hold down the left mouse button and drag the graphic all the way to the right.

Much thanks for the help. What you suggested worked fine.
If I may add my critique.....it does seem to be counter-intuitive at least to my brain but I'm sure there's some reason for that.
I do appreciate all the help.

Cheers!

There are other ways to do it, but this way is generally the least problematic (at least in my experience). Optimally, you would have done the first resize of the D: partition from the left side and then the unallocated space would have been between C: and D:. Another option (not really recommended) would have been to use the Take free space from other volumes option. The reason I don't recommend it is because the automated procedures that do many steps at once can fail and leave you with a corrupted drive (no partitions, for example). This is also why it's so important to create a backup image before making partitioning changes.