How do they store space past the dvd's capacity

Discussion in 'DVD' started by Ken Burkstrum, Nov 11, 2005.

  1. Ken Burkstrum

    Ken Burkstrum Stunt Coordinator

    Joined:
    Dec 19, 2003
    Messages:
    149
    Likes Received:
    0
    Trophy Points:
    0
    I noticed with every dvd I put in the comp it says it has more then then the 4.7GB of DVD capacity, sometimes anywhere up to 10, how is that? I thought you needed a double layer DVD player to play double layer DVDs so im not sure that's what it is. Do they still use 4.7GB DVDs to fit movies and if so how are they cramming so much space in there.

    It just occured to me that if CDs only have 700MB and I have CDs with more then 20 tracks running at 1411Kbps, how in the heck do they fit on there?
     
  2. Holadem

    Holadem Lead Actor

    Joined:
    Nov 4, 2000
    Messages:
    8,967
    Likes Received:
    0
    Trophy Points:
    0
    That's the problem right there, you don't [​IMG].

    Most commercial DVDs are double layer discs.

    --
    H
     
  3. Ken Burkstrum

    Ken Burkstrum Stunt Coordinator

    Joined:
    Dec 19, 2003
    Messages:
    149
    Likes Received:
    0
    Trophy Points:
    0
    and CDs?
     
  4. Jesse Blacklow

    Jesse Blacklow Cinematographer

    Joined:
    Oct 14, 2002
    Messages:
    2,049
    Likes Received:
    0
    Trophy Points:
    0
    No, all CDs are limited to either 72min/650MB or 80min/700MB.

    Also, there's several different types of DVDs, all of which are playable in any DVD player or DVD-ROM drive:
    • Single-sided single-layer (4.7GB, what most recordable DVDs come in)
    • Single-sided dual-layer (~9GB, most commercial DVDs and DL recordable DVDs)
    • Dual-sided single-layer (aka the hated "flippers" and now rarely used)
    • Dual-sided dual-layer (aka DVD-18, as in GB. Used often by Universal for long movies or TV on DVD).
     
  5. Cameron Yee

    Cameron Yee Executive Producer
    Reviewer

    Joined:
    May 9, 2002
    Messages:
    11,763
    Likes Received:
    675
    Trophy Points:
    9,110
    Location:
    Since 2006
    Real Name:
    Cameron Yee
    Playback, no; burning, yes.
     
  6. Roger_R

    Roger_R Second Unit

    Joined:
    Nov 6, 2003
    Messages:
    372
    Likes Received:
    1
    Trophy Points:
    0
    Data tracks on CDs waste a certain amount of space on error-checking, checksums and so on to make sure the data is read correctly. Audio tracks contain no such thing. The error-checking is instead done by the circuits of the CD-player. That's why you can put more data on a CD if you save it as audio tracks.
     

Share This Page