SSD

Documentation

Cell levels

Lower-priced drives usually use quad-level cell (QLC), triple-level cell (TLC) or multi-level cell (MLC) flash memory, which is slower and less reliable than single-level cell (SLC) flash memory

QLC

Quad-level cell

TLC

Triple-level Cell

SLC

Single-level cell, bestest and fastest

Wiping SSD

• https://www.thomas-krenn.com/en/wiki/Perform_a_SSD_Secure_Erase and how SSD works

• https://www.wepc.com/how-to/securely-erase-an-ssd-drive/