It is both an input and output device
Those would probably not be considered an "output" device. CD rom and compact disc are the same thing (CD stands for "Compact Disc").
No CD-ROM means Compact Disc Read-Only Memory. CD-ROM is an input device. However, CD-RW (Compact Disc Read Write) is both a input and output device.
A CDROM drive is neither an input device or an output device. A CDROM drive is a storage device.
A normal CD drive is an input device. A CD-R or CD-RW drive would do both input and output.
A CD-ROM drive.
A CD-ROM (using a player) is an input device because it holds information that is readable. There are writable and re-writable CD's which allow you to add or remove information making it an output device (storage device) as well.
The laser in the drive is the device that actually reads or writes data from and to the CD/CDRW/CDR.
No a disk drive is neither input or output device, it is an optical disk drive (for CD/DVD's) and a disk drive (for hard drives) would be a storage device.
I would say that a CD-ROM is a form of input, as it is "read only memory" and the data on it can only be read, but not written to. If you're talking about CD-R/CD+R drives, then those would be considered both input and output, as it can read from a CD, and writes to CD.
CD/DVD-rom drive, USB Flash drive. ect
CD-ROM burners
A CD ROM drive cannot read a DVD. So it is not possible to use a CD ROM as a DVD ROM. A DVD ROM drive can work with a CD though.