SanDisk P4 64GB SSD outlasts 25x rated endurance

A 16-year-old SanDisk P4 solid state drive survived a massive stress test that far exceeded its official lifespan rating. The drive completed one petabyte of data writes, which is 25 times its rated endurance limit. This result challenges the common assumption that storage devices fail immediately after hitting their warranty threshold. Users relying on older hardware for critical data may find this durability reassuring, though gradual degradation remains a risk.

Legacy drive outlasts 25 times its rated endurance limit

The test focused on the 64GB model of the SanDisk P4, a legacy device using a SATA II interface. WolfyTech conducted the experiment to push the drive beyond its designed limits. The unit contained 32nm MLC NAND flash memory, a technology known for higher cycle endurance compared to modern 3D TLC or QLC chips. This older architecture likely contributed to the drive's ability to withstand such extreme usage without immediate catastrophic failure.

Specifications

• Interface: SATA II
• Capacity: 64GB
• NAND Type: 32nm MLC
• Rated Endurance: 40 TBW
• Tested Writes: 1 PB

The drive logged over 60,000 hours of power-on time and endured more than 1,100 power cycles during the test. Its rated total bytes written (TBW) endurance was 40 TB, making the one petabyte achievement a 25-fold exceedance. Despite surpassing this limit, the SSD continued to function and accept writes. The experiment confirms that the TBW specification serves as a warranty guideline rather than a hard failure point.

Tom's Hardware analysis notes that SSDs can continue operating after exceeding their TBW threshold, though reliability may gradually decrease. Physical wear accumulates in the NAND flash cells over time, affecting long-term stability. The publication states that everything in life has an expiry date, a principle that applies even to the best SSDs on the market. This experiment highlights the gap between warranty specifications and actual physical durability in legacy storage components.