"/tempdrive:Drive_Letter" Switch Halts Unattended Setup

The "/tempdrive:Drive_Letter" unattended installation switch should direct the temporary files to the drive specified by the switch. Although the switch does work, it stops the unattended installation process to prompt you to select a drive on which to install Windows. After you select a drive, the unattended install continues.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.