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I have a Seagate 320GB SATA-300 internal hard drive, model TSD-320AS. The logical geometry of the hard drive is 16,383 cylinders, 16 heads and 63 sectors per track. To my ...
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  1. #1
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    Calculating Hard Disk Size


    I have a Seagate 320GB SATA-300 internal hard drive, model TSD-320AS. The logical geometry of the hard drive is 16,383 cylinders, 16 heads and 63 sectors per track.

    To my knowledge,

    Capacity = Number of cylinders number of heads sectors/track 512 = hard disk size (bytes)

    For my specific hard disk my calculations are:

    16,383 * 16 * 63 * 512 = 8455200768 bytes (not close to being right)

    Does anybody know where I'm going wrong here?

  2. #2
    oz
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    Welcome to the forums!

    Here's a media size calculator you can use if that helps:

    Media Size Calculator
    oz

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    Thanks for the welcome and the media calculator!

    I noticed this on the media calculator page:

    WD Caviar AC28400 Drive H=16, C=16383, S=63, B=512, Size=8.4GB

    The 8.4GB WD Caviar has the exact same cylinders, as my 320GB Seagate. I guess my cylinder values are wrong...

    MaxtorDiamondMax D540 Drive H=16, C=317632, S=63, B=512, Size=160GB

    The 160GB Maxtor is exactly half of my 320GB Seagate. The 160GB Maxtor's cylinders are 317632.

    317632 * 2 should give me my Seagate's cylinders, correct?

  4. #4
    oz
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    I looked up the specs on your drive and it appears that you are correct about them in your first post.
    oz

  5. #5
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    Thanks ozar, I've been searching google too for my drive's specs and all I find is 16,383 cylinders. That would make my 320GB capacity ~8.4GB...according to these calculations 16,383 * 16 * 63 * 512 = 8 455 200 768 bytes. I'm really scratching my head here.

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