Why Do Memory Cards with the Same Capacity Have Different Prices? NAND Flash and Controller Technologies

When comparing memory cards, most buyers focus on capacity. However, two 64GB memory cards can have dramatically different prices, even though their storage space is identical.

The reason lies in the storage architecture hidden inside the card.

NAND Flash typically accounts for more than 70% of a memory card’s manufacturing cost.

Not all NAND Flash is created equal. Manufacturers may use:

• Original wafer-grade NAND
• A-grade NAND
• Downgraded NAND
• Refurbished NAND

Higher-grade NAND provides:

• Greater endurance
• More consistent performance
• Lower failure rates
• Longer data retention

This is often the biggest reason why two memory cards of the same capacity can have very different prices.

A surveillance camera recording 24/7 places much heavier demands on storage than a smartphone. For this reason, professional applications often require higher-endurance NAND solutions.

The controller manages:

• Wear leveling
• Error correction
• Bad block management
• Data transfer

A premium controller can significantly extend card lifespan and improve stability. Low-cost controllers may reduce manufacturing expenses but often sacrifice reliability under continuous workloads.