They're cheap and the vendors like to pretty up the speed charts by ensuring any speed test will mostly hit the cache, even if it comes at the cost of loosing d

They're cheap and the vendors like to pretty up the speed charts by ensuring any speed test will mostly hit the cache, even if it comes at the cost of loosing data during a power loss. Some enterprise SSD/HDD do have large enough capacitors to quickly commit the cache to a flash version or write it out, though usually you have a battery backed RAID controller for that.