92GB transfer in 32 min = mbps?

Discussion in 'Mac Pro' started by LarryJoe33, Aug 10, 2017.

  1. LarryJoe33 macrumors 6502a

    LarryJoe33

    Joined:
    Jul 17, 2017
    Location:
    Boston
    #1
    Just fired up my new Fw 800 external hard drive and did a clone of the internal SSD to it. 92GB in 32 minutes. Is this at 800 speeds? What’s the math?
    --- Post Merged, Aug 10, 2017 ---
    Sorry meant to put this in the MacBook Pro forum. I’m sure a mod will but still applicable I guess.
     
  2. blomadam macrumors newbie

    blomadam

    Joined:
    Jul 10, 2017
    #2
    92 GB x (1024 MB / 1 GB) x (8 bit / 1 Byte) = 753,664 megabits
    32 min x ( 60 s / 1 min) = 1,920 seconds

    753,664 megabits / 1,920 seconds = 392.5 mbps

    I don't have all that much experience with FW800, but it seems to me that this is faster than typical FW400 speeds.
     
  3. SteveJobzniak Suspended

    SteveJobzniak

    Joined:
    Dec 24, 2015
    #3
    https://techinternets.com/copy_calc?do

    Type 92GB, select firewire and click the speed you wanna check. spoiler: It ran at FW400 speed (35 minutes).

    The actual link may really have been fw800, but you got fw400 transfer rate over it. That may be due to controllers, harddrive speeds etc.
     
  4. LarryJoe33 thread starter macrumors 6502a

    LarryJoe33

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    #4
    Outstanding detail. Thanks so much.
     
  5. dollystereo macrumors 6502a

    dollystereo

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    #5
    FW 800 it is in theory 800mbps, but in practice is more like 500-600 mbps.
    The maths are correct, a hard drive is full of small files, so 400mbps / 50MB/s is reasonable in average.
     
  6. LarryJoe33, Aug 10, 2017
    Last edited: Aug 10, 2017

    LarryJoe33 thread starter macrumors 6502a

    LarryJoe33

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    #6
    Thank you. I understand there are lots of variables. I should also note that this was using CCC and I am sure the software is analyzing, comparing etc. A better test would be a straight copy and paste of a large file.

    I’ll take it though. The same transfer using CCC and a USB 2.0 2.5 inch spinner used to take more than 1.5 hours.
     
  7. InuNacho macrumors 65816

    InuNacho

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    In that one place
    #7
    I have a NewerTech Raid 1 box with some Seagate 7200 drives, and the speeds are in the 650 mbps range. In my experience CCC is slower than copy & paste but it never screws up.
     
  8. MacUser2525 macrumors 68000

    MacUser2525

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    Location:
    Canada
    #8
    Nor should it the files copied using it should be bit for bit identical as it uses rsync as the engine for the transfer. It does a file checksum comparison on each and every file copied ensuring you get no errors once it says it has completed, that is something a simple copy and paste will never do.
     
  9. LarryJoe33 thread starter macrumors 6502a

    LarryJoe33

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    Jul 17, 2017
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    #9
    Well that makes me feel good about my 400 speed given all CCC is doing and the quality of my CCC clone.
     

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