ioctl(6, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[10]=[52, 01, 00, 00, 00, 06, 00, 00, 20, 00], 
      mx_sb_len=64, iovec_count=0, dxfer_len=32, timeout=0, flags=0x3, 
      data[32]=["\0&\6\1\0\4a\1\0\310\4@\0\310\4@\0\252\343\300\0\0\0 \0\252\343\300\0\0\0\0"], 
      status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=4, info=0}) = 0

SCSI Call :

  cmd[10]=[52, 01, 00, 00, 00, 06, 00, 00, 20, 00]
  52		  READ TRACK INFORMATION
  01		  Open false, LTN Flag (Logical Track number)
  00, 00, 00, 06, Get Infos for Track 6
  00 		  Reserved
  00, 20, 	  32 bytes Additional Length
		  Track Information Block bytes 
  00		  Control Byte

SCSI Response :

  data[32]=["\0&\6\1\0\4a\1\0\310\4@\0\310\4@\0\252\343\300\0\0\0 \0\252\343\300\0\0\0\0"]
             00  01  02  03  04  05  06  07  08  09  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31
  data[32]=["\x00\x26\x06\x01\x00\x04\x61\x01\x00\xc8\x04\x40\x00\xc8\x04\x40\x00\xaa\xe3\xc0\x00\x00\x00\x20\x00\xaa\xe3\xc0\x00\x00\x00\x00"]
  	Free Blocks from 16 to 19 : \x00 \xaa \xe3 \xc0
	Free Blocks               : 11199424
	dvd+rw-mediainfo reports  : 11199424