Click Start > Rt Click on Computer > Select Manage
In the left pane, under Storage category, click on Disk Management Now select and rt click on the partition you wish to modify. In the context menu, you will see options to Extend, Shrink or Delete the partition. Select the option you want.
You can not merge partitions in Windows with this Utility. If your 2nd partition is empty, you can delete the 2nd partition and then extend the 1st partition, to use the freed up space. Also note that you can extend only to the right; if you are desirous of extending the partition to the left, you may have to use a 3rd party utility, like Acronis. Sometimes one or more options may be grayed out and thus unavailable. It could be that such a step may be physically not possible. How To Resize A Partition In Windows, if Disk Management fails.
Should you wish to continue, nevertheless, please first backup your important data should anything go wrong. You may have to use diskpart.exe !
Diskpart utility can do everything that the Disk Management console can do, and more! It’s invaluable for script writers or anyone who simply prefers working at a command prompt. For more information on it click
KB300415.
Enter diskpart in start menu's search bar and hit enter. A 'command prompt' like window will open. Type list disk and hit enter. This will show you a list of all your hard disks. Now type: select disk <disk number> to select the disk you want to work with.
If you want to create a partition. Type 'create' and a set of options will appear. Choose one, and type create <new option> There are 2 types of partitions you can create : Primary and Extended. Only a Primary partition can be made bootable, so if you are planning to install an OS, you will have to select this option. For backup purposes you may opt for Extended partitions.
Next, to see which number is associated with the volume you are planning to work with, type: list volume
You will get a list. To select one type: select volume <number> (or select partition <number> as the case may be) Now depending on what you want to do to the partition you can select any of the following commands. Typing help and hitting enter enumerates the options :
Example :
To extend size by 5GB : Type - Extend size=5000
To shrink the volume by minimum 1GB, upto a maximum of 5 GB : Type - Shrink desired=5000 minimum=1000
You can even delete a partition by typing - Delete Partition and hitting enter.
Windows also includes a additional command-line tool for file, system and disk management, called Fsutil. This utility helps you to change the short name of a file, find files by
SID's (Security Identifier) and perform other complex tasks.
FSUtil and Diskpart are powerful, but not for the inexperienced Windows user. So do be careful, please.
If you get the message : There is not enough space available on the disk(s) to complete this operation. Most new computers with OEM Vista pre-installs come with 4 partitions. Hard disks configured as basic disks are limited to 4 primary partitions or 3 primary partitions and 1 extended partition and multiple logical drives. And as such, if you try to shrink the OS partition, you may find that you cannot create a 5th partition due to this limit.
There could be two possible solutions for this issue: 1) As the disk pre-configured by OEM may have conflicts with disk management tool in Windows Vista, you should try some 3rd party tools like Auslogics Freeware Defrag, to repartition the disk. 2) You may try to delete a less important partition created already and merge the space together to create a new partition with proper drive letter. Deleting the partitions created by the OEM is often not possible due to the way the OEMs configure the partitions. Therefore the option then is to extend the operating system partition back to the original size to regain use of the unallocated space. If additional storage is needed, consider adding an external USB hard disk.
