Can I recover erased MacBook files?

The write cache sprint

- by BRIAN WILLIAMS

Consumer solid-state drives (SSDs), including those Apple fits inside Macs, have a limited capacity to write data at full speed. That's set by the size of their SLC (single level cell) write cache, as once that's filled, speed drops to about a third. This works by writing single bits to memory cells in the SSD, instead of multiple bits.