n "x" speed

Posted on 2006-03-24
Last Modified: 2010-04-26
Let us say I have a 32X CD-ROM and I am copying a file into a HDD of speed 5400 RPM. What exactly is the speed used for data transfer?

Also what is this 8x thing in the DVD specs? Why is the number low when compared to 32X and 48X CD-ROMs?
Question by:learnit_johnqpublic
    1 Comment
    LVL 69

    Accepted Solution

    1X for CDs = 150K/sec
    1X for DVDs = 1200K/sec
    DVDs have more data packed on a track, so their transfer rates are higher.

    8X DVD transfer = 9600K/sec theoretical
    32X CDROM transfer = 4800K/sec theoretical

    Your hard drive has a much higher data transfer rate, typically around 40MB/sec, so it doesn't enter into the equation when figuring out data transfer speed.  Actual rates will vary, because the location on the disc may have more or less data, and CLV and CAV play a part:

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