Boot Mac OS X off external drive?

Discussion in 'iMac' started by Raima, Mar 3, 2010.

  1. Raima macrumors 6502

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    Jan 21, 2010
    #1
    I Got an external raid enclosure that consists of 4 x 1.5TB HDDs configured in raid 5. Is it possible to use the external raid enclosure as the start up disk on an iMac i7 and use the internal drive as a time machine backup drive?

    I'm just wondering if this is possible?
     
  2. spinnerlys Guest

    spinnerlys

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    #2
    Theoretically and practically yes, but as the fastest interface on your Mac is the Firewire 800 port, you won't experience any speed advantages the RAID might offer you, if that is what you are after.
     
  3. Raima thread starter macrumors 6502

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    Jan 21, 2010
    #3
    The external enclosure will be connected via firewire 800. How would this compare to the internal sata 300 connection?
     
  4. spinnerlys Guest

    spinnerlys

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    #4
  5. Raima thread starter macrumors 6502

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    Jan 21, 2010
    #5
    Oh so firewire is 800 megabits transfer, not 800 megabytes transfer?

    Are there are disc benching utils available on the mac? I wouldn't mind running the test and giving the enclosure a bit of a work out.
     
  6. spinnerlys Guest

    spinnerlys

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    #6
    Yes. As USB 2.0 does not transfer with 480MB/s, but with 480 Mbit/s, which it does not do either anyway.

    S-ATA 1.5Gbps and S-ATA 3.0 Gbps, and soon S-ATA 6.0 Gbps, also use bit as data transfer measurement.


    Disk Benchmarking tools:

    AJA System Test found here: http://www.aja.com/products/software/

    and XBench.
     
  7. Raima thread starter macrumors 6502

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    Jan 21, 2010
    #7
    You were spot on with the Firewire 800 results. I'm getting inconsistent results with the SSD tho. The performance degrades as the number of tests increase.
     

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