need help with parallels really badly!

Discussion in 'Windows, Linux & Others on the Mac' started by theimp, Feb 14, 2007.

  1. theimp macrumors member

    Oct 12, 2006
    Ithaca, NY
    i just realized that i didnt allocate enough memory for the virtual hard drive in parallels. so i went to image tools and tried to increase it. in the regular parallels screen it reflects the change, but when i log into windows it still thinks the hard drive is small, what do i do?? i am trying to install matlab for a big project and need to fix this asap! thanks!
  2. Mitthrawnuruodo Moderator emeritus


    Mar 10, 2004
    Bergen, Norway
    Did you run through all of the steps from the faq?

  3. theimp thread starter macrumors member

    Oct 12, 2006
    Ithaca, NY
    oops, i didn't read that, i was convinced this was just a weird issue. thanks so much.
  4. rogercohen macrumors newbie

    Mar 6, 2008
    Method to Expand Parallels Disk Image

    The Parallels disk image size and location is setup during installation. I was conservative, and set it to about 7.8 GB. It turned out that that disk image size was too small, after I installed more software.

    Parallels offers the Parallels Image to "expand" the Windows XP disk image, but after running the application, the Windows XP disk image does not appear to be larger. Nor does that disk image "expand," as Parallels says it will.

    The problem appears to be that the image "can grow" in size, but neither Parallels nor Windows knows how to use the extra space that was allocated.

    There are many procedures posted on the Net for expanding the Parallels Windows disk image size, but most rely on using extra partitioning software. The method suggested by Parallels results in Windows seeing a new partition, not in expanding the existing partition's size.

    I found the following simpler procedure, which worked like a charm.

    Reproduced here, with the grammar and instructions cleaned up a bit.


    Expanding a Parallels Disk Image. What They Don’t Tell You.

    On the initial install of Windows XP under Parallels, I was very conservative in the disk space I allocated to it. After Windows repeatedly yelling at me to do something about the lack of disk space I figured I would.

    When setting up the Windows Virtual Machine, I had the image set to “Expanding.” A bit deceiving, for there is a procedure that is not “included” in the help file for accomplishing this. This procedure allows Windows to see the extra space that Parallels has allocated:

    1. Find your hard disk image file on the host machine (in this case Mac OS). Run the Parallels Image on it and expand it to the desired size.

    My Parallels disk image is located in:

    ~/Library/Parallels/Microsoft Windows XP/winxp.hdd

    These days, Parallels is installing that image in:


    2. Use the Finder to duplicate the hard disk image you wish to expand.

    3. Open Parallels but do not start Windows. Open the Parallels Preferences for the virtual machine. Change the hard disk image path to the duplicate image. (Note, this is not the "Default Folder for Virtual Machine" setting you first see. It is the Hard Disk setting, lower on the Preferences screen.)

    4. Add a new hard disk via the Add button at the bottom of the screen. Set the new hard disk's path to the original image. The purpose of this and the above step is to boot from the duplicate disk, so that Windows can have full access to the disk (original image) you wish to expand.

    5. Boot up Windows. Windows will report that it has identified new hardware. After that is finished, then navigate to Start -> Run. Type <DISKPART> (no <chevrons> and no quotes), and press Run/Enter.

    6. In the new window that appears type: <list volume> <return>

    7. After that process runs, a list of disks appears. Notice that Volume 1 and Volume 2 look identical. Note: Volume 2 should be the original hard disk image.

    8. Select Volume 2 by typing: <select volume 2> <return>. Then extend it by typing <extend> <return>. Once that is complete type <exit> <return>. Then shut down Windows.

    9. Before starting Windows, clean up the Virtual Machine preferences by using the Parallels preferences to delete the second hard disk, and to switch the Hard Disk 1 path back to the original hard disk image. You can put the duplicated Win XP hard disk image into the Mac Trash.

    10. Restart Windows. Rebooting may be necessary if Windows "detects new hardware."

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