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Nov 28, 2010
22,670
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It works. I have an internal SSD for Mac OS X and an internal HDD for data storage in my 2009 MBP and I can use them at the same time.
Why do you think, it shouldn't work?
A Mac Pro can have up to four drives (even more when wanted) and they can be accessed at the same time too.
And an optical disk drive (ODD) is just another drive, you can access it at the same time as you can access any other drive.
 
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backinblack875

macrumors 6502a
Original poster
Aug 23, 2010
613
46
USA
so put the OS on SSD, how would you do that btw, and use the HDD for storage. But it wouldn't be as slow as an external right since its on the inside?
 
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Nov 28, 2010
22,670
28
located
so put the OS on SSD, how would you do that btw, and use the HDD for storage. But it wouldn't be as slow as an external right since its on the inside?

Yes, you put the OS on the SSD, via installing whatever OS you have or cloning it to it.
And yes again, you can use the HDD for storage and it will be as fast as an internal HDD, giving your 75 to 100 MB/s read/write speeds.

MacBook, MacBook Pro: Replacing the Hard Disk Drive, transferring data to the new HDD

the guide includes:
  • 0. Identify your MacBook or MacBook Pro
  • 1. Getting a new HDD
  • 2. Guides to replace the internal HDD with a newer one
  • 3. Transferring data from the old HDD to the new HDD
  • 4. Using the optical disk drive (ODD) slot for placing an SSD or HDD inside the MB/P (OPTIBAY)


See here:
image clickable
2012_03_16_pC1_DualHDDsetupSpeeds.png
 
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dusk007

macrumors 68040
Dec 5, 2009
3,391
63
But it wouldn't be as slow as an external right since its on the inside?
It is not limited by some slow IO port but it is not really much faster. Connected via USB3.0 or Thunderbolt is as fast. Just Apple notebooks only have the slow IO ports like USB 2.0 and FW800 which also limits somewhat.
One benefit is that it is internal. Always there, nothing to plug in. Spins up in 2 seconds if you need it.
 
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