Search for:

Available article translations:

How to give more hard disk space to Windows Virtual Machine

  • Parallels Desktop 10 for Mac
  • Parallels Desktop 9 for Mac
  • Parallels Desktop 8 for Mac
  • Parallels Desktop 7 for Mac


You are running out of free space in your Virtual Machine and want to increase the virtual hard disk size.


Even if you have an Expanding virtual hard drive - it would not expand above the limit which is set in Virtual Hard Drive Configuration. You need to increase it manually in order to allow disk to expand further.


Warning! We strongly recommend to check your Virtual Machine's hard disk for errors and back up your data before following the steps below.

NOTE This article will not apply for Boot Camp Virtual machine. The primary partition size cannot be increased.

In order to increase Virtual Hard Drive size, please do the following:

  • Start Parallels Desktop but do not start your Virtual machine or shut it down if it is running;
  • In Parallels Desktop menu bar please click on Window menu to open the drop-down list;

  • Click on Virtual Machines List;
  • In the Virtual Machines List that shows up right-click on your Virtual Machine and choose Configure;

  • Go to Hardware tab, open Hard Disk 1 and click Edit;

  • Please select the new size of the virtual machine. Check "Resize file system" and click Apply.

A progress bar will appear and then your virtual hard drive will be resized.

To make sure the changes were applied successfully please check:

  • The size of the Virtual hard drive (Hard Disk 1) was changed;

  • Start Windows, go to Start ► Control Panel ► Administrative Tools ► Computer management ► Disk Management;

The size of the main partition (the partition Windows boots from; it is (C:) by default) should be equal to the size of the Virtual Hard Disk (Hard Disk 1)

  • Go to Start ► Computer. Right-click on Local Disk (C:) and choose Properties. Check the size of the Local Disk (C:) - it should be equal to the size of the Virtual Hard Disk and (C:) partition in Disk Management (see above).

If the File system was not resized:

NOTE: We strongly recommend to backup your Virtual machine before following the steps below.

If Resize File System option is greyed out for some reason or you cleared its checkbox or for some reason Windows did not accept the changes to the file system you will notice that while the size of the Hard Disk 1 (Virtual hard disk) has successfully changed, the size of the Local Disk (C:) in Windows still remains unchanged.

Please do the following:

Start 'RUN' in Windows with keys Windows+R and type in »(Edit-Box) "diskmgmt.msc" (without quotes) and press Enter to open the Disk Management in Windows. The Disk Management reports you now have an extra partition on the hard drive which is marked as Unallocated:

You can manually add this Unallocated partition to your main (C:) partition:

  1. Right-click on the main (C:) partition and choose Extend Volume from the list

  2. Extend Volume Wizard will open. Click Next.

  3. On the Select Disk page you may choose how much extra space should be added to the main (C:) partition. By default the whole Unallocated partition will be added. Click Next.

  4. Click Finish on the next page and the Unallocated partition will be added to the (C:) partition.

  5. Now go to Start ► Computer to verify the Local Disk (C:) has accepted the changes you have just made and has been actually resized.


Search words:

I need to get this reduced, as I have no space left on my HDD.

No errors, need to install more programs that will nor run on an Apple product

My VM is 64GB and I need to expand that to 128GB. I have an iMac 1TB Fusion drive so I have plenty of space. I cannot find how i expand this VM size

1e0c43ccf6ca78fa6744efc9edbc0659 1e5db16426987d561060acdf56d947b4 33c4522b6fa9ca8e050f19b889fb58f1 790d27220dd34433ff172f45c18cfb98 48e7cf384e3b46432e32e6040476f122 fb0e3c3e2247964007f03acae43ffd0d

Was this article helpful?
Tell us how we may improve it.
Yes No
Desktop Virtualization
- Parallels Desktop 9 for Mac
- Parallels Transporter
- Parallels Desktop Switch to Mac Edition
- Parallels Desktop for Mac Enterprise Edition
- Parallels Management-Mac for Microsoft SCCM
Server Virtualization
- Parallels Cloud Server
- Parallels Containers for Windows 6.0
- Parallels Virtuozzo Containers
- Parallels Automation
- Parallels Automation for Cloud Infrastructure
- Parallels Business Automation Standard
- Parallels Virtual Automation
- Parallels Plesk Panel Suite
- Web Presence Builder
- Parallels Plesk Automation
- Parallels Small Business Panel
- Value-added Services for Hosters
- Parallels Partner Storefront
Services & Resources
- Cloud Acceleration Services
- Professional Services
- Support Services
- Training & Certification