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Apple presents Fusion Drive, a new technology installed on the new models of MacBook pro Retina and iMac 2012. A new way of storing information!
Apple talked about Fusion Drive: what is it about?
At the time when hard drives became a "bottleneck" for the powerful circuitry that Apple computers nowadays mount, here came a new technology created to remove this hitch …
The peculiar characteristicsi of an SSD (Solid State Disk) are undoubtedly the speed in reading and writing and the minimum response time, as regards HD instead they are capacity and price.
Fusion Drive is not a common hybrid drive
very evident that they are complementary to each other and here is where Apple merges the two technologies creating a new one: Fusion Drive!
Two distinct physical units, one SSD and a HDD, are presented to the user as a single volume. The 128GB solid disks will presumably be the recently used Toshiba and Samsung classics while the HDDs will be in the 1TB or 3TB cut.
The end user won't have to worry about anything, no preference or configuration screen. The operating system will be installed by default on the SSD as well as the apps, while the documents will be placed on the HDD. The SSD will be completely dedicated to the system swap, while a process will take care of "scheduling" those files or apps that go well on HDD, perhaps based on their static or user use!
Fusion Drive Apple: what and how it works
On the page of the site Applededicata ai nuoveiMac, we read:
The new iMac brings with it a revolutionary storage option: it's called Fusion Drive, and it combines a large hard drive with a high-performance flash memory unit. Fusion Drive intelligently manages your data, and does it automatically. In the flashiest memory, it stores the apps, documents, photos and everything you use most often. Everything else moves it to the hard drive. In this way you start your iMac in an instant, and it takes less and less time to open the applications and files you use the most, because the system slowly learns to know your habits.
If you thought it was a common hybrid drive with the SSD acting as a cache, you are wrong. MacObserver explains it better:
To be clearer, this is not a caching concept, at least not in the most used meaning of the term. Saying cache would also mean that data on the SSD is duplicated, but this is not the case. If you own 1TB of mechanical drive next to a 128GB SSD, you have a 1.12 TB storage platform. This truly is the fusion of all available space on two separate disks.
For example, data cloning caching is what Intel offers its enterprise customers with Automated Tiered Storage. The technology adopted by Apple, however, is different; this time the explanation of Ars Technica:
In a cache solution, such as Intel, the files live on the hard disk and are only temporarily copied to the SSD cache depending on usage. With Fusion Drive (), data is actually copied from one level to another, rather than just being copied to cache.
And the beauty of the technology infused in the OS does not depend on the underlying hardware: the two physical units are displayed on the Mac as a single logical unit; this means that if you break lHD, you can replace it with a third party drive andreconfigure it as Fusion Drive.
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