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how come 4.7 gb dvd-r can't not back up 4.5 gb movie?

Discussion in 'DVDR' started by hart94109, Jun 13, 2003.

  1. hart94109

    hart94109 Member

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    i try to back up a dvd which content 4.5 gb movie. but when i try to copy, it pop out a mesage that show the dvd-r doens't have enough space to back up , and it will take my own risk.
    Also when i use mouse right click the properties of the dvd, it show that original dvd has 4.5 gb, but when i try to burn it ,it tell me that this dvd is about 4.75 gb big. so which size is correct?
     
  2. Discmania

    Discmania Active member

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    The movie is probably 4500Mb which is not the same as 4.5Gb - it is as it says nearer to 4.75 Gb. A blank DVD disc described as 4.7Gb capacity can be misleading because it is infact 4380Mb(or 4.38Gb if you prefer). When it comes to blank discs just remember 4.38 and not 4.7!
     
  3. Oriphus

    Oriphus Senior member

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    I thought it was 4.38GB as well, but i have been reading that it is closer to 4.43GB. Anyway, the principle is the same.
     
  4. Discmania

    Discmania Active member

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    Yes you may be right at 4.43Gb but Nero will not burn a disc a fraction more than 4.38Gb (I've tried it).
     
  5. herbsman

    herbsman Moderator Staff Member

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    even though the red bar in Nero is at 4.5 Gb : )
     
  6. golden_35

    golden_35 Regular member

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    It is because in one kilobyte there are 1028 bytes. KILO = 1028 not 1000. The higher the numbers, the more the difference. Do the math. It kind of sucks i know!!!
     
  7. ken0042

    ken0042 Regular member

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    Actually it's 1024, not 1028. (Must be a number divisable by 8)

    A DVD-R holds 4 700 000 000 bytes. (Or actually 4 680 000 000, but you get the idea.)

    4 680 000 000/1024 /1024 /1024 = 4.38 GB
     
  8. golden_35

    golden_35 Regular member

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    sorry yes 1024 bytes in a kilo
     

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