2 Replies Latest reply: Oct 26, 2010 5:38 PM by Beddo
Udder Level 1 (25 points)
Hello All,
I've got a first Gen 24 inch 2.33 Ghz iMac maxed out with 3GB of RAM.
I started paying attention to how fast I can transfer about 2.5 Gigs of data to my Firewire 400 and Firewire 800 drives, as well as a local copy on my internal 500gb disk. I look at Activity Monitor when I do the copies. I'm not looking for a huge explanation, I just wanted to know if the numbers I'm seeing are expected for an iMac like mine that has a bus speed of 667.

Copy of 2.5gb file from internal disk to Firewire 400 drive
Result: 16 mb/s read (peak), 16 mb/s write (peak)

Copy of 2.5gb file from internal disk to Firewire 800 drive
Result: 31 mb/s read (peak), 31 mb/s write (peak)

Copy of 2.5gb file locally from one folder to another
Result: 41.5 mb/s read (peak) 41.5 mb/s write (peak)

Now I've seen some numbers out there where Firewire 800 transfer speeds beat my local file transfer speed. Is the performance I'm seeing expected for my hardware, and if I were to upgrade to a current 27 inch iMac, can anyone comment on the increase of Firewire & local disk performance I may see?

Thank you!

PowerBook G4 Ti 867, 24 inch iMac 2.33, Mac OS X (10.6.4)
  • baltwo Level 9 (62,215 points)
    When using Carbon Copy Cloner to make backups, I'm getting 1.5 GB/min with a 27" iMac i7 w/12 GB RAM over FW 800. About half that for FW 400 and half again w/USB 2.0. Older and less capable machines will take longer.
  • Beddo Level 1 (25 points)
    On my 2008 iMac I noticed that my FW800 drive will connect at 400 sometimes. I usually need to unplug the FW cable from the iMac, power cycle the drive and plug it in after it's ready, then I will see Connection Speed at 800.

    If you are having problems in Bootcamp, you need to use different drivers.. Legacy 1394 drivers, not the default ones.