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To a storage port driver, a storage class driver is a higher-level driver with built-in, device-type-specific functionality. In general, every storage class driver is responsible for the following:
Claiming each device represented by a physical device object (PDO) passed to its AddDevice routine by the PnP manager
For each such PDO, creating a functional device object (FDO) and attaching it to the device stack
If the driver controls a partitionable device, creating physical device objects (PDOs) to represent each partition and responding to enumeration requests
Interpreting system I/O requests (IRPs)
Mapping IRPs to SCSI class/port interface requests (SRBs with SCSI CDBs)
Establishing time-out values for requests
Limiting the size of data transfers to suit the limits of the underlying HBA
Handling error conditions that are not already handled by the storage port driver, such as check-condition status or bus resets