When running ProDiscover Basic from a Bart PE Boot Disk, you may find some systems where the local disk is not shown in ProDiscover (or the PE environment). This is normally caused by missing disk drivers.
The following links should help to create a PE Disk that can read the system.
http://www.nu2.nu/pebuilder/help/english/drivers.htm
http://www.nu2.nu/pebuilder/drivers/