Apple Repair Service
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iMac Introduced in Late 2012
iMac is distinguishing by it ultrathin design,and having No DVD drive.
One way to improved the speed of the computer
Install SSD drive defin speeds up the computer, because SSD drive is expensive and storage size is smaller,therefore Apple introduce a FUSION DRIVE
At Present Fusion drive only work on Mac Mini & iMac introduced late 2012
Fusion drive manages your data in the background,and automatically move frequently used data to SSD drive for quicker access, and infrequently data to the larger storage Hard drive.