## Physical Device Driver Reference

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### Adjunct Data

At times it is necessary to pass data to the Resource Manager services that can be relevant in one case but not in another call to the same service. In these cases, this optional data is passed in a linked list of structures called an Adjunct List.

The contents of the structures are determined by the adjunct types that are defined in RMBASE.H. A few of the more common adjunct types are listed as follows:

ADJ_DEVICE_NUMBER Contains the zero-based unit number for the device being created. The Resource Manager will use this number to enumerate the key for the device.

ADJ_ADAPTER_NUMBER Contains the zero-based adapter number for the adapter being created. The Resource Manager will use this number to enumerate the key for the adapter.

ADJ_SCSI_TARGET_LUN Contains the SCSI Target/Lun for the device being created. The Resource Manager will generate a SCSI type enumeration suffix as described in Device Adapter Keys.

ADJ_ADD_UNIT Contains the ADD/DM ADD Handle and Unit Handle assigned to the device being created.

ADJ_DRIVER_DATA Contains the device driver information for the detected device.