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I want two drives to appear as one continuous volume on OSX

how would this be done?

they are both connected via sata

ultimately this will be shared over a network from the OSX file server. And even more ideally, this will function as a time machine backup.

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Check out apple.stackexchange.com/questions/69538/…, which is instructions for creating a Fusion Drive via OSX Core Storage. I'm no expert, but I see no reason why this shouldn't work with two HDDs instead of a SSD and a HDD. –  zpletan Nov 8 '12 at 16:30
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1 Answer

Here are Apple's instructions for using Disk Utility to create a RAID set.

Of course, knowing more about your hardware (the computer we are talking about, etc) could improve answers and how specific they get.

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okay, so I can combine partitions across physical drives? I speculate that I'll have a slimmed down OSX partition on one of the drives, and then combine a large partition of storage on the rest of that drive, and the entire partition of the second drive. If this is how I understand it –  cqm Jun 13 '12 at 21:50
    
@RD sounds like you would follow the instructions for Create a concatenated disk set on that page then, and since it doesn't come with any warning about needing to boot to a separate disc to be able to include the boot drive in the set... apparently you can set up that array the way you describe. –  Bon Gart Jun 13 '12 at 22:18
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