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How long would this download take?

Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
I want to make sure I get the maths on this totally correct

say you have a 24 mb/s connection (and got all of that)

How long would it take (in theory) to download a full 4GB of data ? (in seconds)

Just wondering cos I've seen an ISP with that speed but also that teenyweeny monthly download limit

Comments

  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    25 minutes. You'll be shifting ~150mb per minute.
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I make it 22 minutes :p
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    But I'm realistic, you're assuming everything is 100%. It never is. :p
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    But I'm realistic, you're assuming everything is 100%. It never is. :p

    Ah yes, but he said:
    say you have a 24 mb/s connection (and got all of that)

    Mind you, to get a server to upload that fast you would need to open multiple connections simultaneously via a download manager or something. And apart from major ones, most servers probably have less than that upload as their maximum capacity!

    Torrent is the way to go, for all files I think. (well, splitting files into small chunks and having lots of people seeding / distributing) A world wide hub of data, where you can get any data you want from everyone, there are no limits except what you can download at then.
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    All my servers were hooked up via 100mbit - best way to download these days is off the newsgroups. I regularly get 1.5 megabytes per second on my 10mb connection :).
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    All my servers were hooked up via 100mbit - best way to download these days is off the newsgroups. I regularly get 1.5 megabytes per second on my 10mb connection :).

    Wow, my 4 megabit at home could download at up to 480kb/s, which I thought was fast!
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I make it 22 minutes :p

    Not to sound like a school teacher but can you show your workings out .. lol
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    1 byte = 8 bits
    so 24 megabits / second = 3 megabytes per second

    1 gigabyte = 1024 megabytes
    so, 4 gigabytes = 4096 megabytes

    4096 / 3 = 1365.33 seconds
    = 22.75 minutes = 22 minutes, 45.33 seconds

    :p
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    1 byte = 8 bits
    so 24 megabits / second = 3 megabytes per second

    1 gigabyte = 1024 megabytes
    so, 4 gigabytes = 4096 megabytes

    4096 / 3 = 1365.33 seconds
    = 22.75 minutes = 22 minutes, 45.33 seconds

    :p

    I have to disagree with this...

    All of this is academic really. I presume this is LLU ADSL2+ provider in which case you'll never sync at 24meg. Also there is TCP/IP overheads which is about -5%.
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    ^Aye, so around 25 minutes. I'm always right, y'see. It's hard to be a genius, but I pull it off remarkably well... ;)

    24Mb = 2.861MB per second(or 171.66MB per minute)
    4096MB / 2.861MB = 1431.67 seconds
    1431.67 / 60 seconds = 23.86 minutes
    .86 * 60 seconds = 51.6 seconds
    Total time, assuming perfect connection and maximum throughput, no overheads, etc = 23 minutes, 51.6 seconds

    ~25 minutes would be a fair time on a perfect connection. Real world is likely to be a tad longer - especially if the speed isn't at maximum.
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    As it happens, I read an article on 24Mb connections. It's a complete con.

    What happens is that adsl2+ or whatever has the capacity to run up to that, but in order to receive it you have to be within 100m of the exchange. Only 15% of the population are within 1km of an exchange, and it said maximum speeds of 18Mb were far more likely...
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    Quoted speeds/benchmarks/real world results are rarely the same. :)
  • Former MemberFormer Member Posts: 1,876,323 The Mix Honorary Guru
    I was only interested in the theorectial speeds based on the maths, I just wanted to reply to this chap's email from an ISP boasting of their great 24 mb/s service but which only comes with a 4GB limit per month.
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