We help IT Professionals succeed at work.

OS Partition Size in Windows Server 2008?

gateguard asked
Last Modified: 2012-06-21
I popped in the Server 2008 CD and I expected to be able to choose a partition size on my 750gb hard drive in which to install the OS.

But it doesn't appear to give me that option.  I only get the choice to install on one or the other of my two 750gb hard drives.

Am I doing something wrong?  Am I missing something?  Is it wrong of me to even WANT to install the OS on a smaller partition (as I'm used to doing with other versions of windows)?

If I want to use Hyper-V, is it BETTER for the OS partition to be as large as possible?

Any ideas on this?

Watch Question

tigermattSite Reliability Engineer
Most Valuable Expert 2011

When you are given the option to select the partition, there should be a button you can press - "More" I believe it says - which gives you the option to rearrange your partitions, create a new, smaller partition and then format it ready for installation.

Personally, I usually recommend splitting the drive half-and-half. I use one partition for OS and system-specific data, and the other for data which affects the network - user profiles, documents, Shared storage etc.



Thanks, tigermatt.

That "more" button did present more options but they were all greyed out.

There was a delete, a format, and a couple of other options (I'm not in the screen at the moment).

But what about the issue of hyper-v?  Is it possible that I WANT to give the OS all available space on the drive?

Do hyper-v partitions only work inside the OS partition, or can they be on other partitions?

Site Reliability Engineer
Most Valuable Expert 2011
This one is on us!
(Get your first solution completely free - no credit card required)


You were right.  I had a 750gb unallocated space and under "more" I could click "new" and create a partition in that space, which I was free to make any size I wanted.

Then I formatted and was ready to go.

Thanks for the help.


And thanks for the info on hyper-v.

I took your advice and made the OS partition small.

Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.