Will a Fusion Drive help?
Benefit from a hard disk’s capacity and an SSD’s speed at the same time
Fusion Drive is the friendly name Apple came up with for a flash storage and hard disk arrangement that behaves as though it’s just one drive. OS X decides what data should be stored on each. Data that’s accessed frequently and will make the biggest difference to your
Mac’s performance – system files and
anything used at startup, say – is stored on the flash drive, along with anything OS X notices you use often. As its free space dwindles, data you use less often is moved to the hard disk.
Installing an SSD inside suitable Macs is involved work, so the easiest way to set up a Fusion Drive is to add the SSD externally over Thunderbolt or USB 3 – you’ll need the speed of those interfaces to benefit from the SSD’s performance (the latter’s easily more affordable). Otherwise, recent portables and some desktop Macs require major hardware mods, using kit like OWC’s Data Doubler range, to keep the SSD connected at all times.