CHOOSING THE RIGHT NAND FOR YOUR MISSION

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NAND selection can significantly impact SSD endurance, performance, reliability, capacity, lifespan, and behavior across temperature. Understanding the differences between SLC, MLC, TLC, and QLC is critical when selecting storage for demanding Defense + Aerospace applications.

There is no universally “best” NAND. The right choice depends on your application, workload, operating environment, mission life, and capacity requirements.

Let's start with the basics:

Flash memory is a type of non-volatile memory that retains data without power. It stores information using an array of floating gate transistors, also known as memory cells.

NAND Flash is a specific type of Flash memory where read, write, and erase operations are performed in blocks, similar in concept to how hard disk drives (HDDs) manage data.

There are four primary types of NAND Flash, classified by how many bits are stored per memory cell:

SLC — SINGLE-LEVEL CELL | 1 bit per cell

• Maximum endurance, performance, and operating margin. Best suited for write-intensive, extreme-environment, and long-life applications where reliability takes priority over capacity and cost. 
• Current NAND technology 50,000 - 100,000 Program/Erase Cycles (PEC)

MLC — MULTI-LEVEL CELL | 2 bits per cell | EOL in 2026

• MLC NAND historically provided a middle ground between SLC and TLC. However, as NAND manufacturers have transitioned production toward higher-density technologies, MLC availability has become increasingly limited.
• For new designs and programs, MEMKOR evaluates SLC or high-endurance TLC based on the application's endurance, capacity, performance, environmental, and lifecycle requirements..

TLC — TRIPLE-LEVEL CELL | 3 bits per cell

• Higher density enables significantly greater capacities while trading some write endurance and operating margin. Well suited for capacity-intensive applications when paired with an appropriate controller, ECC, NAND management, and workload.
• Current technology offers 3,000 Program/Erase Cycles (PEC)

QLC — QUAD-LEVEL CELL | 4 bits per cell

• Maximum storage density and lower cost per bit, but with substantially lower native endurance and tighter operating margins. Generally better suited for read-intensive and controlled-environment applications.
• Current technology offers 500-1,000PEC
• QLC IS NOT appropriate for the demanding write endurance and environmental requirements MEMKOR targets.

As more bits are stored per cell, voltage thresholds become more granular, reducing design margins and increasing complexity. While this boosts storage density and reduces cost per gigabyte, it also introduces trade-offs.

Selecting the right NAND flash technology is critical for meeting application-specific requirements in performance, endurance, and reliability for defense and aerospace applications.

TEMPERATURE CHANGES THE EQUATION

NAND behavior is highly dependent on operating temperature. As NAND density increases and the number of voltage states per cell grows, maintaining reliable data placement and retrieval becomes increasingly demanding.

At temperature extremes, SSD controllers may require more aggressive error correction, NAND management, and thermal management to maintain data integrity and protect flash life. These effects can impact sustained write performance, latency, endurance, and long-term reliability.

This is why comparing SSDs at room temperature tells only part of the story.

DON'T JUST COMPARE DATASHEETS

Evaluate storage under the temperatures, workloads, and operating conditions your platform will actually experience.