Difference Between Disc and Disk

Difference Between Discs and Disks : 

Disc :  A disc refers to optical media, such as an audio CD, CD-ROM, DVD-ROM, DVD-RAM, or DVD-Video disc. Some discs are read-only (ROM), others allow you to burn content (write files) to the disc , and some can be erased and rewritten over many times (such as CD-RW, DVD-RW, and DVD-RAM discs).All discs are removable, meaning when you unmount or eject the disc from your desktop or Finder, it physically comes out of your computer.

Disks : A disk refers to magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive. Disks are always re-writable unless intentionally locked or write-protected. You can easily partition a disk into several smaller volumes, too.Disks are usually sealed inside a metal or plastic.

Types of Discs : 

      • Compact Disc (CD)
      • Digital Versatile Disc (DVD)
      • Blu-ray Disc

CD : The CD is a disc that can store digital data. It is limited to 700 MB. 
There are two main types:

      1. CD-R
      2. CD-RW

CD-R you burn data, so that ultimately you can not erase the CD.
CD-RW you can erase the disc and rewrite data on it.
we can distinguish the audio CD used for music industry and the CD-ROM can store any data. This disc can be read on CD players.

DVD : The DVD (Digital Versatile Disc) is another disc that has the same features as the CD but it requires appropriate player and it can hold more data. A normal DVD can hold 4.7 GB, it has the possibility of being double-layered or double-sided rising capacity to 8.5 GB It may also be twice which provides about 17 GB but it is the maximum.This disc is used to distribute the Movies.

Blu-ray Disc : There is also the new Blu-ray which allows even greater capacity of 50 GB. It can store HD videos (High Definition Videos) that take up space. It is necessary to have readers those are expensive right now.
CD-R : A CD-R is a writable disc, (the R stands for Recordable). This type of disc can have data burnt to it once only. If the disc is not finalised or closed with burning, then additional content can be added to the disc, until it reaches its full capacity. A CD-R does not allow for existing content to be deleted off the disc.

CD-RW : The RW stands for Re-Writeable. This type of disc can have data added to it, and once the data is no longer required, this can be deleted and new data added to the disc. In this way, the disc can be used multiple times. A CD-RW can be written to up to 1000 times. A CD-RW can be compared to a flash drive where the content can be wiped and then re-written with new data.

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