$ sudo blktrace -d /dev/sdf -o -|blkparse -i -
  8,80   1        1     0.000000000  4693  D   R 36 [sg_inq]
  8,80   1        2     0.000590071     0  C   R [0]
  8,80   1        3     0.000624346  4693  D   R 144 [sg_inq]
  8,80   1        4     0.001093812     0  C   R [0]
  8,80   1        5     0.001121290  4693  D   R 252 [sg_inq]
  8,80   1        6     0.001577685     0  C   R [0]
  8,80   1        7     0.001593793  4693  D   R 252 [sg_inq]
  8,80   1        8     0.002063534     0  C   R [0]
  8,80   0        1     2.004478167  4695  D   R 36 [sg_inq]
  8,80   0        2     2.005054640     0  C   R [0]
  8,80   0        3     2.005078936  4695  D   R 144 [sg_inq]