What is the diameter in centimetres (a whole number) of a CD (not a mini-CD)?
Portable CD player track the amount of time you hold the button down. The liquid crystal display provides a visual of how much battery is left, what track (number) is currently playing, and the amount of time elapsed on the track. Some portable CD players can play CD-R/CD-RW discs and some can play other formats such as MP3-encoded audio. The 8 cm CD provides a smaller alternative to the normal 12 cm CD (although with a lower capacity). Miniature players exist that only play this format. Like a full-size CD player, a portable CD player reads the bumps and grooves using a laser.
Mini CD or very careful placement of the CD in the exact middle of the tray. Not until after the major record labels discontinued them, did the CD Players start to have the 80 mm circular indentation as standard. Since the mid-1990s, all tray loading players have a circular indentation for the Mini CD. Mini CD-R, Mini CD-RW: As of 2007, many manufacturers offer 80 mm CD-R and CD-RW discs for sale in retail electronics and office supply stores. These are sometimes marketed as "Pocket CD-R/CD-RW" (Memorex) or "Mini CD-R" (TDK). Most of the blank discs available in retail hold either 185