Windows Vista Forums

Dynamically expanding virtual hard disk?

  1. #1


    Bo Berglund Guest

    Dynamically expanding virtual hard disk?

    I just would like to know if anyone here can explain *how* the
    dynamically expanding disk grows?

    If I compare to an SQLServer database (which I am familiar with) where
    one specifies by how much it will expand the database file when
    needed, I don't find such a setting for a VHD.

    So what is the principle used when the guest needs to store more data
    in the disk? A fresh VHD file is very small, like 35 kbytes or so,
    what happens when the guest adds data, for example when an operating
    system is installed?

    Is there a specific amount of host disk space added when it expands?

    --

    Bo Berglund (Sweden)

      My System SpecsSystem Spec

  2. #2


    Steve Jain [MVP] Guest

    Re: Dynamically expanding virtual hard disk?

    On Sat, 29 Nov 2008 23:45:04 +0100, Bo Berglund <boberglund@xxxxxx>
    wrote:

    >I just would like to know if anyone here can explain *how* the
    >dynamically expanding disk grows?
    >
    >If I compare to an SQLServer database (which I am familiar with) where
    >one specifies by how much it will expand the database file when
    >needed, I don't find such a setting for a VHD.
    >
    >So what is the principle used when the guest needs to store more data
    >in the disk? A fresh VHD file is very small, like 35 kbytes or so,
    >what happens when the guest adds data, for example when an operating
    >system is installed?
    >
    >Is there a specific amount of host disk space added when it expands?
    Previously, its been in 2MB chunks.

    --
    Cheers,
    Steve Jain, Virtual Machine MVP
    http://vpc.essjae.com/

      My System SpecsSystem Spec


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