A variable-length array of DEVICE_ANNOUNCE headers. The number of entries is specified by the DeviceCount field. Each entry is a DEVICE_ANNOUNCE header in which the DeviceType field MUST be set to RDPDR_DTYP_FILESYSTEM. The drive name MUST be specified in the PreferredDosName field; however, if the drive name is larger than the allocated size of the PreferredDosName field, then the drive name will be truncated to fit. In that case, the full name MUST also be specified in the DeviceData field, as a null-terminated Unicode string. If the DeviceDataLength field is nonzero, the content of the PreferredDosName field is ignored. There is no alignment padding between individual DEVICE_ANNOUNCE headers. They are ordered sequentially within this packet.
