DEV BROADCAST VOLUME

The DEV_BROADCAST_VOLUME structure contains information about a logical volume.

typedef struct _DEV_BROADCAST_VOLUME {
ULONG dbcv_size;
ULONG dbcv_devicetype;
ULONG dbcv_reserved;
ULONG dbcv_unitmask;
USHORT dbcv_flags;
} DEV_BROADCAST_VOLUME;
typedef DEV_BROADCAST_VOLUME *PDEV_BROADCAST_VOLUME;


Members

dbcv_size

Size of this structure, in bytes.

dbcv_devicetype

DBT_DEVTYP_VOLUME.

dbcv_reserved

Reserved; do not use.

dbcv_unitmask

Logical unit mask identifying one or more logical units. Each bit in the mask corresponds to one logical drive. Bit 0 represents drive A, bit 1 drive B, and so on.

dbcv_flags

Flags indicating whether drive or media.

Value Meaning
DBTF_MEDIA Change affects media in drive. If not set, change affects physical device or drive.
DBTF_NET Indicated logical volume is a network volume.


Remarks

Although the dbcv_unitmask member may specify more than one volume in any given message, this does not guarantee that only message is generated for a given event. Multiple system components may independently generate messages for logical volumes at the same time.