Offset Size Name Description
-------- -------- ------------ ---------------------------------
0x00 2 HeadCRC CRC of block header
0x02 1 HeaderType Block type = 0x73
0x03 2 Flags Block flags:
MHD_VOLUME (0x0001)
MHD_COMMENT (0x0002)
MHD_LOCK (0x0004)
MHD_SOLID (0x0008)
MHD_NEWNUMBERING (0x0010)
MHD_AV (0x0020)
MHD_PROTECT (0x0040)
MHD_PASSWORD (0x0080)
MHD_FIRSTVOLUME (0x0100)
0x05 2 HeadSize Block size = 0x000D
0x07 2 HighPosAV
0x09 4 PosAV