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Paul
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Fusion Drive- What is it?

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What IS the fusion drive?

Is it one drive enclosure with both a solid-state storage and a magnetic drive inside? Or, are there two different drives in the "fusion drive" mac mini that are individually interchangeable?

Are there two sata cables, or just one?

I looked up the part number for that drive, but found no specs, just a few for sale...

Edited by: machead3 and oldturkey03 ( )

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Dan
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Update: Here's the breakdown of a Fusion drive from a Mac Mini Arstechnica. Turns out its two devices a HD and a SSD which requires two drive bays.

It's a little early on knowing exactly whats going on inside a Fusion HD. From what has been disclosed so far its a Hybrid hard disk, a disk drive with a SSD in one device. Similar to Seagate's Momentus XT Hybrid HD. What Apple did state is some firmware in the drive that copies the OS files to the SSD. While the Seagate can also do this inherently when you first run it. You don't need to do anything for it to work so I'm not sure whats so special here other than the size of the SSD. But as I stated its too early to know for sure. Here's a writeup from Forbes and what some people are thinking.

Dan,

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Chris Kast
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Nope, it's not hybrid disk -- it's a discreet SSD along with a discreet mechanical HDD. AnandTech did a goot breakdown of what the Fusion Drive is and does: http://www.anandtech.com/show/6406/under...

Note that it looks like the SSD uses the same form factor as the one on the MBA's and the rMBP.

Chris, good catch! Still, its a quasi hybrid ;-} Granted its not just caching, is't also a linearly mapped volume across both discreet storage units within a single device. So it's a completely different approach of storage than what we have seen before within PC systems. It's almost like how LPAR's can be setup in IBM AIX systems. Where dissimilar drives can be seen as a single volume.

Dan,

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nickeditor
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Support Apple document about Fusion Drive:

http://support.apple.com/kb/HT5446

Regards

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Albert Filice
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What would happen if you took out the fusion drive and, say, tried to use it in an enclosure? Would you see the SSD and the HDD or is the software built into the drive and not OS X?

I think your pushing it here. First we're not sure if the Fusion drive is really a single device or not. Then you loose the benefit when you go thru USB or Firewire interface.

Dan,

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