## Virtual Device Driver Reference for OS/2

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### VDHPhysicalDisk Parameter - Function

Function (ULONG) Type of partitionable disks' information to obtain.

Possible values are:

VDHPHYD_GET_DISKS Obtain the total number of partitionable disks
VDHPHYD_GET_HANDLE Obtain a handle to use with the Category 9 IOCtls
VDHPHYD_RELEASE_HANDLE Release a handle for a partitionable disk