Compact Disc
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The compact disc is a digital optical storage medium. A typical CD can hold around 700MB of data on a side, and can be used for the storage of audio, such as music, data, and live CD distributions.
Block Devices
On most setups, compact disc drives show up as SCSI cdrom devices on Linux systems, thus their name will start with "sr".
$ lsblk sda ├─sda1 8:1 0 256M 0 part └─sda3 8:3 0 498G 0 part sr0 11:0 1 1024M 0 rom <---
/dev/cdrom will appear as a symlink to the first detected compact disc drive. This is useful as cdrom devices are not always SCSI devices.
$ file /dev/cdrom /dev/cdrom: symbolic link to sr0