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Resize your VMware ESXi/ESX/vSphere disks (via

Posted by jpluimers on 2011/06/13

James Clements explains how to resize your VMware ESXi/ESX/vSphere disks.

You can resize the disks live when using ESXi/ESX/vShere 4 and up.

When using Windows Vista or 2008 and up, you don’t need special tools for resizing the partitions on those disks: the built-in disk manager can do it.

When using Windows 2003 Server, Windows XP or less, then you need the EXTPART tool from Dell as explained by GeekSeat:

All you need to do now is provision the extra space to the VM, then run the tool at the command line and follow the wizard:

ExtPart - Utility to extend basic disks (Build 1.0.4)
(c) Dell Computer Corporation 2003
Volume to extend (drive letter or mount point): c:
Current volume size : 66285 MB (69504860160 bytes)
Current partition size : 76285 MB (79990815744 bytes)
Size to expand the volume (MB): 76285

that’s it – job done . . zero downtime (watch out of course . . this works differently if you have a clustered disk to extend – see: )

Note the “Size to expand” is actually the number of MB you are adding to the volume as Redelijkheid explains.

Sometimes you need to do this in multiple steps as diskmgmt.msc does not always give the free partition space in megabytes.

There is no need to reboot after expanding using ExtPart.

Edit: 20111222; you can download ExtPart through the DELL web-site; there are also direct http downloads of the EXE and README, and direct ftp downloads for the EXE and README.

If you don’t trust ExtPart, there is always the GParted way as explained by



2 Responses to “Resize your VMware ESXi/ESX/vSphere disks (via”

  1. […] Windows Server 2003 and Windows 2000) require an external tool. (edit: 20111222): For me, The freeware ExtPart from DELL works best. I also have good experience with GParted (the free Gnome bootable Partition editor). A google […]

  2. IL said

    ExtPart looks nice but it can only extend logical drive.
    I ‘ve got HTTP 500 errror when trying to download from that page. There are direct links
    Or simply browse catalog or

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