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My machine is windows 7 ultimate 32-bit with the HDD like this (from left to right);

C: / unallocated space (about 40GB) / D: / E:

Now I want to add this unallocated space into my E: drive without repartitioning the C or D drives. Is there any solution for this?

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(In reply to your comment under Brad Patton's answer:) Step 4 of my answer explains how to move the D drive. –  Dennis Feb 27 '13 at 11:50
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4 Answers

You can do this in Windows.

1) Open Control Panel and go to System and Security.

2) Select Create and format hard disk partitions (you will need admin access).

Control Panel

3) In the Disk Management Console select the partition you want to increase in size and right click to open a pop-up menu.

4) Select 'Extend Volume...' and enter the amount you want to increase the partition by.

Disk MGMT

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I was just typing this answer in. You beat me to it! +1 –  BenjiWiebe Feb 26 '13 at 21:18
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Thank you for all you guys. The trivial extend and shrink is simple for many users. But you didn't noticed that unallocated space is not next to E: drive. –  fly hipy Feb 27 '13 at 6:32
    
@flyhipy just tested this with a blank disk and disk mgmt will extend the e: drive into the unallocated space with the caveat that it will convert the disk to a dynamic disk. –  Brad Patton Mar 5 '13 at 21:44
    
Additionally the free version of Partition Wizard (partitionwizard.com) could be used with the same steps Dennis outlines. –  Brad Patton Mar 5 '13 at 21:45
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You can simply do 1 of 2 things. Either render it as another partition or use gparted to expand your partition to use that space.

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for changing the size, move , reallocate your hard disk partition without delete any partition simply you can use easeus partition master the is free from personal use. external info from here, and download link from here.

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Thank you for all you guys. The trivial extend and shrink is simple for many users. But you didn't noticed that unallocated space is not next to E: drive. –  fly hipy Feb 27 '13 at 6:33
    
no problem anyway!!!! you can move D nearby c with that application then add unallocated space to E –  Kaveh Feb 27 '13 at 11:56
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To accomplish this, you have to move the D drive to the beginning of the unallocated space, then resize the E drive. Many third-party partition managers are able to perform both tasks.

You could, e.g., download the Ubuntu 12.04 (or GParted) LiveCD, burn it to a DVD or create a bootable USB stick and do the following:

  1. Boot from your Live CD and click Try Ubuntu when it asks whether to try or install it.

  2. Press Win, type gparted and click GParted Partition Editor.

  3. Right-click your D and E drive and select Unmount if it's available.

  4. Right-click your D drive, select Resize/Move, place the mouse cursor over the slider, drag the partition all to the left and confirm.

    Now, you have

    C: / D: / unallocated space / E:

  5. Right-click your E drive, select Resize/Move, place the mouse cursor over left arrow of the slider, extend the partition all to the left and confirm.

  6. Click the green checkmark labeled Apply All Operations.

Whenever you resize or move a partition, there's a certain risk of data loss (failing HDD, power outage, etc.). Make sure you backup your most important files.

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