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I'm absolutely blown away by how impossible this task appearing to be. I've been through probably a hundred separate Google search results, every single one explaining how to "right click the volume and click extend". Well guess what, the extend button is greyed out. Here's a screenshot of Disk Management:

Screenshot

I can't use the Windows snipping tool with a context menu open (and my keyboard lacks a print screen button), but believe me when I say that the extend button is greyed out when right clicking the Windows 8 partition. I've tried using DISKPART.exe too:

Screenshot

Would anybody care to fill me in on why Windows is refusing to extend the partition? What will I have to do in order to extend the partition with the remaining 140GB on the drive?

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I used to use "partition magic"(not free) for all that stuff. it would run from windows, or boot off floppy disks(rescue disks), a dos version. very easy to use with a gui. not sure what people use now. –  barlop Jan 5 '13 at 22:01
    
    
I really recommend Paragon's free partition manager. It's not the fastest algorithmically speaking (it will move all your data in the partition, so be prepared to wait a few hours), but I've never had problems with it corrupting anything. (And yes, I've gotten corruption from quite a few other partition managers... even from Windows's own Disk Manager.) –  Mehrdad Jan 5 '13 at 23:02
    
Before attempting to use a third-party tool to relocate the partition, make sure you (a) have a backup and (b) have a Windows recovery or installation disk (USB or DVD) you can boot to. Check that it boots. –  Harry Johnston Jan 7 '13 at 2:23

4 Answers 4

up vote 5 down vote accepted

Windows 7 "Extend" feature works only if the unallocated size is to the right. Yours is to the left. You will need to use a 3rd party partition application (PartedMagic/GParted).

Before messing around with partitions, backup everything first.

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So is it impossible to extend the partition from Windows 8? –  Hubro Jan 6 '13 at 6:34
    
Windows only allows basic partition editing. In your situation I believe you can not Extend the partition because of where the unallocated space exists. You could create a backup system image of the C partition and use a recovery cd/dvd and to combine those two partitions and then restore the system image back onto the merged partition. But it would be simplier and far easier to use a 3rd party application/os to just move the partition/resize. –  Logman Jan 6 '13 at 20:41
    
+1. It might be possible to extend the volume if you first convert the disk to dynamic. But IIRC the system volume can't be extended that way, because it isn't allowed to be fragmented, so that won't work either in this situation. –  Harry Johnston Jan 7 '13 at 2:20

From my experience with dealing with partitions I would suggest 2 options:

  1. GParted - a free linux distribution which can be operated from a live CD and hence removes the limitation cause by manipulating partitions from within the system. - it has very thin GUI but helpful.

  2. EaseUS Partition Master Professional Edition - An amazing tool which can do almost everything and resize/merge/delete partitions without any problem. I really like this program since you dont have 'step outside' of windows, you just give the orders and then it does everything by itself.

Good Luck.

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The extend button is greyed out: that's because the Volume that you are trying to resize is a system partition which is in use so you can not do a change on it,

you can resize the Volume with Partition Wizard!

Download Partition Wizard boot able .ISO image then burn it to a CD and boot it.

here are the links below:

ImgBurn

Partition Wizard Boot able .ISO image

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Actually these days Windows can extend a volume that is in use. –  Harry Johnston Jan 7 '13 at 2:19

you can use this free application

its really simple and very fast to work with partitions

As Partition Magic alternative, EaseUS Partition Master Professional Edition is an ALL-IN-ONE partition solution and disk management utility. It allows you to extend partition, especially for system drive, settle low disk space problem, manage disk space easily on MBR and GUID partition table (GPT) disk under 32 bit and 64 bit Windows 2000/XP/Vista/Windows 7 SP1/Windows 8. The most popular hard disk management functions are brought together with powerful data protection including: Partition Manager, Disk & Partition Copy Wizard and Partition Recovery Wizard. Moreover,

Top Benefits:

Affordable disk management & PC performance optimization utility costs less than competitors with more robust features.
Easy-to-use wizard allows implementation of professional and reliable disk management in minutes.
Set up partitions for when installing dual boot Windows 7 and Windows 8.
Safely merge adjacent partitions into one without data loss.
Copy Wizard to upgrade system disk to a bigger one or copy partition to another with one-click.
Extend system partition to maximize computer performance on dynamic disk.
Better disk management & PC performance optimization utility under Windows & WinPE based bootable disk.
Use with EaseUS Todo Backup to ensure PC's performance and data security.

Main Features

Resize/Move partitions to avoid data loss, like extending NTFS system partition without reboot to maximize PC performance.
Support dynamic disk - resize volume (including resize system volume) and copy volume, convert dynamic disk, etc.
Hot! Safely merge two adjacent partitions into a bigger one without data loss.
Create multiple-partitions, delete partition, or directly delete all partitions.
Hot! Wipe data on unallocated space.
Wipe disk or wipe partition to permanently wipe sensitive data on disk.
Convert dynamic disk to basic disk and Convert FAT to NTFS file system.
Convert primary partition to logical partition and vice versa: convert a primary volume to logical to create a fifth volume on a disk with 4 existed primary volumes.
Speed up your computer by defragmentation.
Disk surface test to check and find bad sectors and rebuild MBR to boot system again.
Linux partition management: delete, create, format, recover EXT2/EXT3 partition, etc.
Built-in WinPE 3.0 based bootable CD/DVD.
Support all hardware RAID, multiple removable storage device, hard disk and GPT disk (support up to 2TB partition on MBR and 4TB partition on GPT).
Support under Windows 2000/XP/Vista/Windows 7 SP1/Windows 8 (32 bit & 64 bit).

you can learn more here :

http://www.partition-tool.com/easeus-partition-manager/

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