How much slower would a full SSD get?

[nr0003]

People say that you should leave 20% of your storage free on an SSD. But with some SSDs that's a lot. For example, if you had a 250gb it would only be 50 GB but if you had a 1TB that would be 200 GB so I was wondering how slow would it make the SSD if I filled it all the way up? Would it slow down to the point that HDDs would be faster than them?

 

[kanewolf]

Reads would still be fast, but writes would be VERY slow. 50% speed hit wouldn't be unexpected. Some disks had a firmware bug that slowed them when they reached 50% full.

 

[kanewolf]

If I cram a bunch of videos and games on an SSD would the loading times be the same if it is full vs half full?

Up to about 90% full, yes. After 90% (the number I have always heard) your write times could get slow because the SSD needs unused pages to write partial pages to in addition to new data.