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.