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I have bought a computer with Windows 8 installed on a 500 GB hard disk. The drive has only one "C" partition, which is around 490 GB. How can divide that single partition into multiple partitions like "D", "E" without disturbing the Windows 8 OS install.

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possible duplicate of Are there any Windows programs to resize partitions? – Keltari Jan 28 '13 at 10:19
@Keltari considering the question specifically addresses Windows 8, overlap might not be enough to warrant closing as duplicate. – kopischke Jan 28 '13 at 10:37

Well... It is pretty simple actually.

  1. Create a Bootable Windows PE RAM Disk on CD-ROM

  2. Include DISKPART on this CD-ROM. You can find it in C:\Windows\System32 on your newly purchased computer.

  3. Boot from this disc and when you get to the command prompt, type diskpart.

  4. Type list volume. Make note of the number of the simple volume you want to shrink.

  5. Type select volume <volumenumber>. Selects the simple volume you want to shrink.

  6. Type shrink [desired=<desiredsize>] [minimum=<minimumsize>]. Shrinks the selected volume to desired size in megabytes (MB) if possible, or to minimum size if desired size is too large.

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If you don't want to reinstall, you could presumably create VHDs from disk management and store files there. The advantages here are you can move the VHDs anywhere and mount it on the same mountpoint (or even use VHDs with storage pools for expandable storage), and since these are files, you don't have to reformat. The disadvantage is its probably a fair bit slower. Steps taken from the answer here, but I posted that too

Preparing a VHD

You can create a vhd from disk manager - hit start, and search for disk management. Select Create and format hard disk partitions (or go to control panel -> computer management -> disk management) enter image description here

Creating a VHD is very simple, select action, and Create VHD

enter image description here

Set up VHD to taste, I've selected a large dynamic disk on the partition I usually store VM images on.

enter image description here

This should result in a new 'disk' you can use like any other disk. Rightclick on the disk name, and select initialise, then rightclick on the partition on the right side to format. Take note of the new drive latter - here its H:

enter image description here

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MiniTool's free Partition Wizard works with Win8. I've used it happily on Win7. Much more capable than Windows partition tools. Easily resizing the boot partition to make way for more, for example.

The VHD option mentioned by Journeyman above is an interesting option though - also present in Win7.

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