Expand Windows Partitions using Extpart.

[adrotate banner=”16″]

If you have run out of space on your boot drive on a Windows server, you can expand the partition after the fact.

Extpart Unable to Connect to C: Utility

Thank You: Works on any hardware!

Expert Tip: Use the Dell Extpart Utility to expand your Windows boot volume.

If you are running your servers in a VMware environment then you can expand the boot volume with zero downtime.

Here is a list of common error messages encountered, the most common causes of these errors is leaving the VMware Disk Management Console open. Remember to close the VMware Disk Management Console to avoid these errors.

Common Error Messages & Variations

  • extpart unable to connect to c: or it does not exist
  • extpart unable to connect to d:
  • extpart “unable to connect to volume”
  • extpart “unable to connect to drive”
  • extpart “unable to connect to <drive letter> or it does not exist

Step 1: Download ExtPart Utility.

[adrotate banner=”26″]

  1. Download extpart utility from Dell
  2. Run the self extracting exe, it will create two files, extpart.exe and extpart.txt.


You can only add space to the partition to the extent that there is free space available on disk directly after the partition you wish to extend.


Step 2: Find Out How Much You Can Expand The Volume

If you already know how much space is available to expand your volume you can skip this step. Detailed instructions on finding the available free space to expand your volume prior to using extpart are here.

Step 3: Expand the Windows Server Boot Volume using the Dell Extpart

Usage:  extpart [ volume . size ]

volume – volume to expand (only basic volumes)
size – size in megabytes to expand  (minimum 8mb)

extpart - expand windows boot partition

Using Extpart Utility to Expand Windows Boot Volume

For example to make the C: drive 4GB bigger:

extpart c: 4096

note: If you get the error Unable to connect to c: or it does not exist then try restarting Windows in safe mode.  If the Disk Management Console is open or VMware tools are running, close them because they are the primary causes of this error.

NOTE: If using VMware remember to expand the boot volume using Virtual Infrastructure Client first before running extpart in your VM.



The DisplacedGuy
(aka Rich)

9 Responses

  1. I was gettiing the:
    “extpart unable to connect to c: or it does not exist”

    Disabling the indexing service worked for me

    Dunno why the indexing service locks the drives, but stopping the service allowed me to use extpart & extend the drives (C: and D:) that previously errored out.

    then restart the service & all was well.

  2. Hello,

    I’ve found this sometimes happens with Extpart too.
    I’m not sure but I believe the ‘free space’ needs to be contiguous to the partition that is being extended.

    Typically if your 1 HDD has multiple partitions (C: System, E: Data for example) you can extend the E: but receive a ‘no free space’ message when trying to extend the C: partition.

    There are tools that can correct this but it’s a pain, its slow, and it will typically require a reboot.

Leave a Reply

Your email address will not be published. Required fields are marked *