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Thread: hard drive question

  1. #1 hard drive question 
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    Data is read from a hard drive at 64x10tothe6 bits/sec. How many seconds does it take to read from the drive a file of size bits? The disk in the hard drive rotates at 120 revs/sec. How many revolutions does the disc make while the file is being read?

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  3. #2  
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    Convert you first figure into bytes per second

    calculate how many bytes are read per revolution

    then compare this with your filesize to be read....

    anymore info than that and I might as well do the sum for you

    In fact there are other considerations, such as seek time, time to get the file info, is the file fragmented? not to mention data integrity, re-reads, ecc corrections.....

    The question as posed is meaningless in the real world, two identical drives in two identical ssytems using the same operating system could give very different results.


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  4. #3  
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    yes it will be good if u do a calculation of it or show your working, as i cant understand what size is the file here
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  5. #4  
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    Number of revs = filesize(bytes) / ( (bits per second read/bits per byte ) /revs per second)

    So suppose revs per second = 10
    bits per second read = 800,000
    bits per byte = 8
    filesize 30000 bytes

    put them all in and turn the handle....

    Number of revs = 3

    TIme for 1 rev = 1 second / revs per second.
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