The built-in partition manager (Disk Management) in Windows 7 hasn't changed much from the Vista days and is still missing some of the most important and basic features like EaseUS Partition Master. The Windows 7 built-in partition manager cannot re-partition an existing primary system partition without having to reinstall Windows. Maybe Microsoft thought that it was good enough and didn't require any update or maybe they wanted to leave such features for the third party software's to fill in.
EaseUS Partition Master Free Edition is a free partition manager software for Windows 7. This free partition manager supports 32/64 bit Windows Operating System including Windows XP, Vista and Windows 7. Home users can perform complicated partition operations by using this powerful yet free partition manager to manage their hard disk. You can use this partition manager freeware to resize, copy, create, delete, format, recover, convert, explore, hide, change, set active partition, merge partitions under your Windows 7 64 bit operation system.
Before you take action, I suggest you to use Partition Copy to backup the data on that partition.
The following is step-by-step instruction to extend system partition (C: drive).
1. Launch EaseUS Partition Master.
If there is no unallocated space behind the system partition, please follow the below steps. If there is unallocated space behind the system partition, please directly go to step 4.
2. Select partition E:, right click it, select "Resize/Move partition" and drag the partition handle leftwards to resize E drive. Then there will be unallocated space behind E: drive.
3. Move E: drive rightwards to let the unallocated space be behind the system partition (C: drive) and click OK.
4. Select the system partition (C: drive), right click it and select "Resize/Move partition", drag the partition handle rightwards to extend system partition (C: drive).
5. Click Apply.
For more detailed information, please visit resizing and moving partitions.
EaseUS Partition Master provides different editions to meet different users' need:
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