The problem is the speed of non-sequential writes and reads. Writes can fall down to Kb/s in some cases, due to the way flash storage works and onboard controll

The problem is the speed of non-sequential writes and reads. Writes can fall down to Kb/s in some cases, due to the way flash storage works and onboard controllers, that are optimised for sequential loads. So can't use them as a cheap HDD upgrade options.