List all block devices and look for a block device with type of ‘rom’:

user1@rhel10-vm2:~$ lsblk
NAME          MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sr0            11:0    1 816.4M  0 rom  
vda           252:0    0    25G  0 disk 
├─vda1        252:1    0     1M  0 part 
├─vda2        252:2    0     1G  0 part /boot
└─vda3        252:3    0    24G  0 part 
  ├─rhel-root 253:0    0    22G  0 lvm  /
  └─rhel-swap 253:1    0     2G  0 lvm  [SWAP]
user1@rhel10-vm2:~$ 
user1@rhel10-vm2:~$ 

‘sr0’ is the block device of type ‘rom’. There is no mount point associated with it at the moment. In the /dev directory, grep the ‘sr0’ block device: