Moving a ton of data (>500GB)

Discussion in 'Mac Basics and Help' started by Rafalski24, Dec 20, 2009.

  1. Rafalski24 macrumors regular

    Joined:
    Sep 27, 2009
    Location:
    Denver, CO
    #1
    So I have a uMBP 5,4 and a bunch of externals. I am going to be moving over 500 gigs of data from one external to another. They both have about the same speed read/write, but with the uMBP I only have one FW800 port. So my question is how should I connect these drives (the way I understand it you only get one 800 Mbps link to the computer and connecting multiple drives only allows them to share this through-put) Will it be fast to connect one via USB and one via FW800 or just daisy chain them using FW800?
    thanks
     
  2. moral-hazard macrumors regular

    Joined:
    Jul 27, 2009
    Location:
    Palo Alto, CA
    #2
    Not sure if someone will know this offhand. USB will limit you to about 30mb/s or so. I would try transferring one file (say, something about a gigabyte in size) both ways and see which one works faster. I know that putting multiple USB devices on a hub would be terribly slow, but I am not sure how fast daisy chaining on FW works in practice.
     
  3. Makosuke macrumors 603

    Joined:
    Aug 15, 2001
    Location:
    The Cool Part of CA, USA
    #3
    It's actually possible, according to the spec, for one Firewire device to transfer data directly to another. Pretty sure that's not actually going to happen in a file copy situation like this, though.

    Based on my admittedly limited experience, I'm going to guess you'll get slightly better real-world throughput with both devices on FW800 than FW800 for one and USB2 for the other. You could of course test, as suggested, but I'm skeptical there's going to be a big difference either way.

    If you already have the cables for a FW800 chain, I'd personally just do that, mainly on account of (admittedly rare) situations where I've had a USB drive flake out on me during a large transfer. Might've just been bad cables (or a bad drive), of course.
     
  4. Rafalski24 thread starter macrumors regular

    Joined:
    Sep 27, 2009
    Location:
    Denver, CO
    #4
    Thats about as far as I got too. Anyone else have any other insights?
     

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