USB flash drives lose data over time due to NAND flash degradation — here's how to protect your files
By
Christine Persaud
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Summary
USB flash drives use NAND flash memory which degrades over time due to charge leakage, especially when not powered on regularly. Data stored on USB drives can become corrupted within months to a few years depending on the type of NAND flash (SLC, MLC, TLC, QLC), with consumer-grade drives (TLC/QLC) being most vulnerable. Environmental factors like heat and humidity accelerate degradation. The article explains that unlike SSDs which have controllers that periodically refresh data, USB drives lack this feature. It recommends regularly plugging in USB drives to refresh the charge, using high-quality drives for long-term storage, and not relying on USB drives as a primary backup solution — instead using cloud storage, external HDDs/SSDs, or optical media for archival purposes.
Key quotes
· 5 pulledThe USB drive in your drawer is slowly losing your data right now
If you have a drawer full of USB drives you transferred who-knows-what to over the years, check them because your data could slowly be degrading.
Consumer-grade USB drives typically use TLC or QLC NAND, which have lower endurance and shorter data retention periods compared to SLC or MLC NAND used in enterprise-grade drives.
Unlike SSDs, which have sophisticated controllers that periodically refresh data, most USB drives lack this feature, making them more susceptible to data loss over time.
The best way to protect your data is to follow the 3-2-1 backup rule: three copies of your data, on two different media types, with one copy stored off-site.
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