USMT 4.0- space estimate


  • I will be using USMT 4.0 for our upcoming XP to Win7 migration and would like to use the space estimate switch to have an idea of how much space will be needed for our profile backups. However, I do not understand the output of the file when I run this command. The command to retrieve a space-estimate for a computer is scanstate.exe /p:filename(txt or xml) /(migxmls).

    An example of a txt or xml file is below and I do not understand this because my backup sizes have been 1.6GB, 750MB and others. This does not appear to match anything in the output file. I think that this estimate is supposed to reflect space needed for the source and destination but the reported sizes still do not match. Can anyone explain how I am supposed to read this space-estimate file?



    <?xml version="1.0" encoding="UTF-8"?>
        <size clusterSize="4096">16572416</size>

    Wednesday, June 22, 2011 1:02 AM


  • Hi,

    First, I would like to share the following article with you.

    The <temporarySpace> value shows the disk space, in bytes, that USMT uses to operate during the migration—this does not include the minimum 250 MB needed to support USMT. The <storeSize> value shows the disk space, in bytes, required to host the migration store contents on both the source and destination computers.

    The steps of this procedure also depends on how many users you have. It will estimate the data under the users' profile. So please check how big these profiles are.

    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”
    Thursday, June 23, 2011 10:05 AM