Older external hard drives were large, noisy, and required power. New ones are just like SSDs. So how can you tell them apart?
SSD
Why El Capitan needs an SSD or Fusion Drive, and all about their care and maintenance.
Do I need any additional software to support it?
Most of the computer-like devices that you use now store their data on solid-state disk (SSD) rather than traditional hard disk (HD) components. Are they also the best way ahead for regular computers?
RAID arrays used to be the preserve of serious servers and high-end workstations. Should they now be on your shopping list?
Can you squeeze more from your existing Mac, or must you replace it to improve performance?
The Eclectic Light Company 