Slow-ish FW800 Transfer Speed

Discussion in 'MacBook Pro' started by smeg36, Nov 9, 2010.

  1. smeg36 macrumors regular

    Joined:
    Sep 16, 2009
    #1
    I purchased a FW800 enclosure for my Seagate 500GB 5400rpm HD. I just got a 2010 13" MBP. I was previously using a 2006 MBP with an ExpressCard slot, and had this hard drive connected over eSATA. According to TomsHardware the max sustained write speed of this drive is around 65MB/s, which is what I was getting over eSATA.

    So I got the FW800 enclosure now that I can't use eSATA with the thought that I'd be getting the same 65MB/s that this drive is capable of. FW800 should be able to handle up to 100MB/s. But I'm only getting around 40MB/s, closer to what I should be getting if I was using FW400. Any ideas about why I lost 25MB/s in transfer speed?
     
  2. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #2
    Maybe you have an enclosure with a bad chipset, but even though Firewire 800 has a theoretical throughput of 800 Mb/s (100MB/s), in real life it only has 65 to 75 MB/s, as even USB 2.0 with 480 Mb/s has no real life speed of 60 MB/s.

    My FW800 speeds vary from time to time, depending on file count. The more files I have, the slower the speed, but with big 10+ GB files I can have 65 to 75 MB/s via FW800 or 100 MB/s and more via eSATA.
     
  3. smeg36 thread starter macrumors regular

    Joined:
    Sep 16, 2009
    #3
    Is there any way to test that, or should I just get it replaced while I can? There aren't a whole lot of FW800 options out there for an enclosure. I got this one as an open box from Amazon Warehouse. Maybe that's why it was returned.
     
  4. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #4
    You could try to copy one large file and see how the speeds go then. Btw, what file system is the external HDD using?

    PS: If you don't have one large file (10GB +), you could use AJA System Test for that.
    [​IMG]
     
  5. smeg36 thread starter macrumors regular

    Joined:
    Sep 16, 2009
    #5
    My drive has two partitions, a HSF+ and a FAT32. Most of the time I transfer files to the FAT32 partition to play on my PS3. That's the partition that gets around 40MB/s, usually transferring 3-4GB files. I just tried transferring a 8GB file to the HSF+ partition and got 50MB/s consistently. Using the same file, drive, and partition over USB got me 27MB/s.

    I put the drive in another USB enclosure I have I did the same 8GB file transfer to the HSF+ parititon and got 30MB/s.
     

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