The Definitive Guide toAI Data Centers
Ask the GuideAboutAccount
Guide › Glossary › QLC

QLC · Quad-Level Cell

Flash storing four bits per cell, offering high density and low cost at the expense of write endurance and speed.

Current numbers

~7 GB/s vs ~300 MB/sQLC SSD vs HDD sequential read; 20–100 µs vs ~4 ms latencyas of 2025 · register ↗

← All terms