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Failing to reset the mass storage controllers, despite being correctly configured to do so, seems to be one of SysPrep's foibles currently. There seems to be little or no information about this in the Microsoft knowledgebase, possibly because actually resetting the mass storage list is not a documented feature of SysPrep, however it is certainly the cause of much consternation in the wider support community. The problem seems to occur on every other occasion SysPrep is used. In the first instance the reset will work correctly and cause SysPrep to take anything up to an hour to do its stuff, but the next time it is used (with the mass storage reset enabled) SysPrep appears to bypass the reset and complete its work in the more usual two minutes or so. The third occasion it will work, the fourth will fail and so on. As there is no way for to predict the likely outcome of a mass storage reset a workaround for this "feature" has been added to the Image Prep Tool. After SysPrep has completed, the resulting sysprep.inf file will be examined for the correct entries and, if they are not found, SysPrep will be told to go back and try again. If it then fails a second time a warning message will be displayed.
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