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To unmount an image

  1. Open Command Prompt.
  2. Type:

    imgmount /unmountdriveletter:

driveletter:Specifies the drive letter of the mounted image to unmount.


  • To perform this procedure, you must be a member of the Administrators group on the local computer, or you must have been delegated 
    An assignment of administrative responsibility to a user, computer, group, or organization.

    For Active Directory, an assignment of responsibility that allows users without administrative credentials to complete specific administrative tasks or to manage specific directory objects. Responsibility is assigned through membership in a security group, the Delegation of Control Wizard, or Group Policy settings.

    For DNS, an assignment of responsibility for a DNS zone. Delegation occurs when a name server (NS) resource record in a parent zone lists the DNS server that is authoritative for a child zone.

    the appropriate authority. If the computer is joined to a domain, members of the Domain Admins group might be able to perform this procedure. As a security best practice, consider using Run as to perform this procedure.
  • To open a command prompt, click Start, click Run, type cmd, and then click OK.
  • To view the complete syntax for this command, at a command prompt, type:

    imgmount /unmount /?

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imgmount /unmount

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