cd-disc refers to the disc. DISC-RAND means random playback within the disc, DISC-SCAN means sequential playback within the disc, DISC-PRT means repeat playback within the disc, RAND means all random playback, and PRT is the single-song repeat playback button. Press the RPT button to repeat the current track, and press it again to cancel the RPT function. The SCR button is used for MP3-WMA files with long song names. Press SCR to display the latter part of the song name in stages on the LCD screen. Here is more information about CDs: 1. CDs are on the path to obsolescence. This is not limited to cars but reflects a broader trend in storage media innovation. CDs are a type of storage medium, and fundamentally, there is no difference between CDs, flash memory, or even tapes. The situation CDs face now is similar to what cassette tapes experienced before. Just as cassette players disappeared from cars, CDs will eventually become obsolete due to their low storage density and large size. Record companies could easily replace CDs with write-protected USB drives or even SD cards for distribution. In the realm of portable music players, portable CDs disappeared long ago, which is a telling sign. 2. Optical discs as a storage medium began to decline after the emergence of high-capacity USB drives and portable hard drives, as seen even in Sony's PSP. Nowadays, optical drives are no longer standard in laptops, with many people replacing them with SSDs. Blu-ray, in fact, has never truly gained widespread adoption, especially in China, where there is almost no demand for purchasing Blu-ray discs.
