An optical disk is an article in which optical information is stored and used to store data, and is classified into non-rewritable optical disks such as CD-ROMs, DVD-ROMs, and the like; and rewritable optical disks such as CD-RWs, DVD-RAMs, and the like. The optical disc is a device that reads and writes using the laser principle. It is a rapidly developing auxiliary memory that can store various digital information such as text, sound, graphics, images and animations. Disc definition: that is, a high-density optical disc (Compact Disc) is an optical storage medium developed in modern times different from a complete magnetic carrier (for example, a magneto-optical disc is also an optical disc), and a method of processing a recording medium by using a focused hydrogen ion laser beam to store and reproduce information, Also known as laser disc. So, what is the capacity of a CD?
    How big is the capacity of a CD? The current DVD is generally 4.7GB, and a DVD-9 can reach a capacity of about 9GB, but the price is slightly more expensive. The small reunion DVD (a small-diameter disc) has a capacity of 1.2GB.
    The CD has a fixed capacity of 720MB and a small reunion CD capacity of 240MB.
    The capacity of the optical discs is fixed. The so-called ultra-high compression serial DVD on the market actually compresses the video size by reducing the video resolution and image quality, so that a DVD can hold multiple episodes of the TV series. It's not what advanced compression software you use.
    In fact, this practice is very contrary to the development of the backlight. The original intention of the DVD is actually to provide higher quality than the VCD, and the playback time is unchanged (both 120 minutes), but now it is used by many people to load low-quality, long-term (such as multi-set series) video. went.
    The above is the introduction of the CD and the content of a CD, I hope to help everyone.
Large Baby Booster Seat,Rocking Baby Chair,Baby Outdoor Chair,Baby Dining Chair
Zhejiang Lamon Technology Inc. , https://www.baby-chair.com