PATA vs SATA: optical drive matchup... 2x burn

Discussion in 'Mac Pro' started by trancepriest, Mar 21, 2009.

  1. trancepriest macrumors 6502

    trancepriest

    Joined:
    Nov 9, 2007
    Location:
    South Florida
    #1
    Test of simultaneous burn of iso disc image to 2 SuperDrives conducted on 07 Mac Pro & 09 Mac Pro both equipped with dual SuperDrives.

    2007 Mac Pro: http://farm4.static.flickr.com/3587/3372220611_91e359f851_o.png

    2009 Mac Pro: http://farm4.static.flickr.com/3552/3372346588_a7c4c57df1_o.png

    Hardware Configurations:
    1. Mac Pro 2007 8 core 3GHz, 16GB RAM, RAID 5 (4x750GB), Optiarc AD-7170A dual 16X SuperDrive

    2. Mac Pro 2009 8 core 2.93GHz, 6GB RAM, 640GB HD, no RAID, HL GH41N dual 18X SuperDrive

    Software Configurations:
    Toast 10 Titanium v10.0.1 with 2 instances of application running per computer.

    RESULTS: SATA SuperDrive in Mac Pro 09 trounces PATA (IDE) SuperDrive in Mac Pro 07 by 6x DVD burn rate. MP 07 averaging 4x, MP 09 averaging 10x. If the disc image was larger the sustained rate on the MP 09 would have been been 13x. The iso image was of Windows 7 Build 7000, file size 2.44 GB.
     
  2. m1stake macrumors 68000

    Joined:
    Jan 17, 2008
    Location:
    Philly
    #2
    SATA vs PATA doesn't matter for optical drives. Neither bus is saturated.

    The only reason the 09 is faster is because it has a... faster drive! :rolleyes:
     
  3. trancepriest thread starter macrumors 6502

    trancepriest

    Joined:
    Nov 9, 2007
    Location:
    South Florida
    #3
    Why are both of the 07 SuperDrives going at an average 4x write rate when they are 16x DVD write drives? As demonstrated by this test, I think it matters significantly when using 2 drives simultaneously on the PATA connection.
     
  4. Dark Dragoon macrumors 6502a

    Dark Dragoon

    Joined:
    Jul 28, 2006
    Location:
    UK
    #4
    There were a few debates about the problems caused by having both drives on the same IDE connection right back to the first Mac Pro 2006.

    When I used to burn two disks at a time using two IDE optical drives on my Mac Pro 2006 there was a large increase in burn time.

    Which is why you buy your own (faster and cheaper than Apples) SATA optical drive and cable and fit it yourself. That's if you have one of the older Mac Pros.

    Once you have done that you should have similar or better performance than the Mac Pro 09 running Apples drives.
     
  5. trancepriest thread starter macrumors 6502

    trancepriest

    Joined:
    Nov 9, 2007
    Location:
    South Florida
    #5
    If the IDE bus bandwidth is adequate... what is the issue with slowdowns when 2 drives are connected?
     
  6. Dark Dragoon macrumors 6502a

    Dark Dragoon

    Joined:
    Jul 28, 2006
    Location:
    UK
    #6
    It's been a long time since I really looked into it but I seem to remember it was to do with the inability of two devices on a single IDE connection to simultaneously read or write.

    So even if the IDE connection can transfer data far faster than the optical drives can read/write, one of the drives will be waiting for the other drive to finish it's operation when both drives are active, hence the slowdown.
     
  7. m1stake macrumors 68000

    Joined:
    Jan 17, 2008
    Location:
    Philly
    #7
    Oh, I see what you're doing. Burning two disks makes all the difference as the above poster noted.
     
  8. trancepriest thread starter macrumors 6502

    trancepriest

    Joined:
    Nov 9, 2007
    Location:
    South Florida
    #8
    Dark Dragoon,

    Thank you for your explanation. With known issue it's strange that they would encourage 2 SuperDrives in the older Mac Pros with both sharing one IDE bus.

    Thanks for enlightening this thread with your presence.
     

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