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What Disk Utility Shows for Fusion Drive

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StevenT42

macrumors 6502
Original poster
Jun 9, 2010
371
0
I am copying my post from another thread, since this seems to be coming up.

Disk Utility shows a single volume for the Fusion Drive, not the SSD and the HD. When highlighting the first Macintosh HD in the list, it shows Type: Logical Volume Group.



When highlighting the second Macintosh HD in the list, it shows this:



Using iStat Menu's Disk Activity, it shows that there are two separate disks:



They would appear to be a Samsung 128GB SSD and a Hitachi 5400RPM HD.

You CAN use USB 3.0 and FireWire 800 hard drives on the 2012 Mac mini (I am using them now), you just can't add them to the Fusion Drive logical volume.
 
K

kgian

macrumors regular
Jul 17, 2011
187
8
If you load up the recovery to reinstall mountain lion does it show the two different disks?
 
S

StevenT42

macrumors 6502
Original poster
Jun 9, 2010
371
0
There is a recovery partition in Disk Utility during recovery mode, but it does not distinguish between SSD or HD:

 
S

StevenT42

macrumors 6502
Original poster
Jun 9, 2010
371
0
The Fusion Drive is two physical drives, but the OS treats them as a single, logical drive.
 
S

StevenT42

macrumors 6502
Original poster
Jun 9, 2010
371
0
stoca01 said:
Can somebody run blackmagic test on it ?
Click to expand...

Already posted in another Fusion Drive thread, but I'll repeat it:

Black Magic Disk Speed Test:

2011 MacBook Air 256gig SSD: 242.0 MB/s write, 258.8 MB/s read (this is a Samsung drive.)
2012 Mac mini, 1TB Fusion Drive: 284.6 MB/s write, 441.8 MB/s read
 
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