These are just a few examples. This picture shows the front of a mini-tower IBM compatible computer. The computer case is the chassis containing the computer devices and power supply. Disk drive media refers to the things that you put inside of a disk drive to record data. Hard drives have magnetic metal oxides deposited on rigid metal disks for recording data.
Floppy disks use a flexible vinyl surface covered in magnetic oxides.
Disk drives are called non-volatile storage. Information stored on a disk drive remains when the computer shuts down. CD-ROMs record data by etching data onto vinyl disk media. A laser scans across the disk surface and produces reflections that are read by a detector. The power button turns on and off the computer.