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Boot-US does not find SCSI or IDE disks under NT

Under Windows NT on a system with mixed disk types (EIDE and SCSI) it could happen that Boot-US detects only one disk type (SCSI or EIDE). This is not a failure of Boot-US, but it is caused by Windows NT. You could verify that NT has the same problem by starting the Disk Administrator of Windows NT. This program will also not detect the same disk type. The problem of the "apparent missing" disks is caused by non-installed or non-started drivers for the corresponding disk type. The following hints are intended to help you solving this problem.

Install (E)IDE drivers:
The driver atdisk.sys handles IDE disks while the driver atapi.sys handles EIDE disks. The instructions to install or start the driver atdisk.sys for IDE disks (see also Microsoft Knowledge Base article Q133491) are as follows:

  • The driver atdisk.sys must reside in the directory %systemroot%\system32\drivers.
  • In Control Panel / Devices set the start mode of the device ATDISK to "System". If you want that the newly added drives appear first in the Disk Administrator set the start mode to "Boot".
    Attention: changing the start mode could prevent NT from booting.
  • Start the device ATDISK.
  • Start the Disk Administrator of NT and assign appropriate drive letters to the partitions of the (E)IDE and SCSI disks. If you do not assign drive letters, Windows will choose them automatically at the next startup and they might be different from the current drive letters.
  • Restart Windows NT.

Install SCSI (and EIDE) drivers:
SCSI drivers are provided usually with the SCSI controller. The installation is straightforward:

  • Open Control Panel / SCSI Adapters and click on Drivers / Add....
  • A dialog box opens. Select the appropriate model of the SCSI controller.
  • Insert the installation CD or diskette in the appropriate drive.
  • NT copies the necessary driver files from the CD or diskette.
Remark: (E)IDE drivers can also be installed with this approach.