[root@localhost ~]# lsblk
NAME  MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdb     8:16   0 222.6G  0 disk
sr0    11:0    1   1.9G  0 rom
loop0   7:0    0   1.9G  1 loop /run/mgalive/ovlsize
sda     8:0    1   1.4M  0 disk /mnt
[root@localhost ~]# 
[root@localhost ~]# lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
        |__ Port 6: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 6: Dev 3, If 1, Class=Human Interface Device, Driver=usbhid, 12M
        |__ Port 7: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 12M
        |__ Port 8: Dev 5, If 0, Class=Mass Storage, Driver=usb-storage, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
[root@localhost ~]# 
[root@localhost ~]# mount /dev/sr0 /mnt
mount: /dev/sr0 is write-protected, mounting read-only
[root@localhost ~]# 
[root@localhost ~]# df -T /mnt
Filesystem     Type     Size  Used Avail Use% Mounted on
/dev/sr0       iso9660  1.9G  1.9G     0 100% /mnt
[root@localhost ~]# 
[root@localhost ~]# df -T --block-size=1 /mnt
Filesystem     Type     1B-blocks       Used Available Use% Mounted on
/dev/sr0       iso9660 2007152640 2007152640         0 100% /mnt
[root@localhost ~]#
[root@localhost ~]# ll /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8:1.0/host13/target13:0:0/13:0:0:0/block/sr0
total 0
-r--r--r-- 1 root root 4096 Dec 20 15:04 alignment_offset
-rw-r--r-- 1 root root 4096 Dec 20 15:04 badblocks
lrwxrwxrwx 1 root root    0 Dec 20 15:04 bdi -> ../../../../../../../../../../../virtual/bdi/11:0/
-r--r--r-- 1 root root 4096 Dec 20 15:04 capability
-r--r--r-- 1 root root 4096 Dec 20 15:04 dev
lrwxrwxrwx 1 root root    0 Dec 20 14:39 device -> ../../../13:0:0:0/
-r--r--r-- 1 root root 4096 Dec 20 15:04 discard_alignment
-r--r--r-- 1 root root 4096 Dec 20 15:04 events
-r--r--r-- 1 root root 4096 Dec 20 15:04 events_async
-rw-r--r-- 1 root root 4096 Dec 20 15:04 events_poll_msecs
-r--r--r-- 1 root root 4096 Dec 20 15:04 ext_range
drwxr-xr-x 2 root root    0 Dec 20 14:36 holders/
-r--r--r-- 1 root root 4096 Dec 20 15:04 inflight
drwxr-xr-x 2 root root    0 Dec 20 15:04 integrity/
drwxr-xr-x 2 root root    0 Dec 20 15:04 power/
drwxr-xr-x 3 root root    0 Dec 20 14:39 queue/
-r--r--r-- 1 root root 4096 Dec 20 15:04 range
-r--r--r-- 1 root root 4096 Dec 20 15:04 removable
-r--r--r-- 1 root root 4096 Dec 20 15:04 ro
-r--r--r-- 1 root root 4096 Dec 20 15:04 size
drwxr-xr-x 2 root root    0 Dec 20 14:39 slaves/
-r--r--r-- 1 root root 4096 Dec 20 15:04 stat
lrwxrwxrwx 1 root root    0 Dec 20 14:36 subsystem -> ../../../../../../../../../../../../class/block/
drwxr-xr-x 2 root root    0 Dec 20 15:04 trace/
-rw-r--r-- 1 root root 4096 Dec 20 15:04 uevent
[root@localhost ~]#
[root@localhost 13:0:0:0]# cd /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8:1.0/host13/target13:0:0/13:0:0:0/block/sr0
[root@localhost sr0]#
[root@localhost sr0]# cat removable
1
[root@localhost sr0]# cat ro
0
[root@localhost sr0]# cat size
3921920
[root@localhost sr0]# echo $(cat size)*512 | bc -q
2008023040
[root@localhost sr0]# cd ..
[root@localhost block]# cd ..
[root@localhost 13:0:0:0]# pwd
/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8:1.0/host13/target13:0:0/13:0:0:0
[root@localhost 13:0:0:0]#
[root@localhost 13:0:0:0]# ll
total 0
drwxr-xr-x 3 root root    0 Dec 20 14:36 block/
drwxr-xr-x 3 root root    0 Dec 20 14:36 bsg/
--w------- 1 root root 4096 Dec 20 15:04 delete
-r--r--r-- 1 root root 4096 Dec 20 15:04 device_blocked
-r--r--r-- 1 root root 4096 Dec 20 15:04 device_busy
-rw-r--r-- 1 root root 4096 Dec 20 15:04 dh_state
lrwxrwxrwx 1 root root    0 Dec 20 14:36 driver -> ../../../../../../../../../../bus/scsi/drivers/sr/
-rw-r--r-- 1 root root 4096 Dec 20 15:04 eh_timeout
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_capacity_change_reported
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_inquiry_change_reported
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_lun_change_reported
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_media_change
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_mode_parameter_change_reported
-r--r--r-- 1 root root 4096 Dec 20 15:04 evt_soft_threshold_reached
-r--r--r-- 1 root root    0 Dec 20 15:04 inquiry
-r--r--r-- 1 root root 4096 Dec 20 15:04 iocounterbits
-r--r--r-- 1 root root 4096 Dec 20 15:04 iodone_cnt
-r--r--r-- 1 root root 4096 Dec 20 15:04 ioerr_cnt
-r--r--r-- 1 root root 4096 Dec 20 15:04 iorequest_cnt
-rw-r--r-- 1 root root 4096 Dec 20 15:04 max_sectors
-r--r--r-- 1 root root 4096 Dec 20 15:04 modalias
-r--r--r-- 1 root root 4096 Dec 20 15:04 model
drwxr-xr-x 2 root root    0 Dec 20 15:04 power/
-r--r--r-- 1 root root 4096 Dec 20 15:04 queue_depth
-rw-r--r-- 1 root root 4096 Dec 20 15:04 queue_type
--w------- 1 root root 4096 Dec 20 15:04 rescan
-r--r--r-- 1 root root 4096 Dec 20 15:04 rev
drwxr-xr-x 3 root root    0 Dec 20 14:36 scsi_device/
-r--r--r-- 1 root root 4096 Dec 20 15:04 scsi_level
-rw-r--r-- 1 root root 4096 Dec 20 15:04 state
lrwxrwxrwx 1 root root    0 Dec 20 14:36 subsystem -> ../../../../../../../../../../bus/scsi/
-rw-r--r-- 1 root root 4096 Dec 20 15:04 timeout
-r--r--r-- 1 root root 4096 Dec 20 15:04 type
-rw-r--r-- 1 root root 4096 Dec 20 15:04 uevent
-r--r--r-- 1 root root 4096 Dec 20 15:04 vendor
-r--r--r-- 1 root root 4096 Dec 20 15:04 wwid
[root@localhost 13:0:0:0]#
[root@localhost 13:0:0:0]# cat model
DVD-ROM VM 1.1.0
[root@localhost 13:0:0:0]#