16-year-old SATA II SSD survives 1 petabyte of writes — 25x more than the drive's endurance rating

At a glance:

• A 2010 Sandisk P4 64 GB SSD was written with 1 PB of data, 25 × its rated 40 TBW endurance.
• The drive logged over 60,000 power‑on hours and more than 1,100 power‑cycles and still operates.
• The experiment, documented by YouTube channel WolfyTech, shows older 32 nm MLC NAND can outlive modern TBW specifications.

What happened

The YouTube channel WolfyTech set out to stress‑test a 16‑year‑old 64 GB Sandisk P4 SSD. Over several months the team wrote a continuous stream of data until the cumulative total reached one petabyte (1,000 TB). Despite the drive’s advertised endurance of 40 TBW, the SSD survived the test without any catastrophic failure. In addition to the massive write volume, the drive accumulated more than 60,000 hours of power‑on time and was powered up and down over 1,100 times, mimicking a real‑world usage pattern rather than a single, uninterrupted write burst.

Why it matters

Manufacturers typically quote a TBW (terabytes written) figure to define warranty limits, but the Sandisk P4 experiment demonstrates that the TBW rating is a conservative guideline rather than a hard cutoff. The drive’s 32 nm multi‑level cell (MLC) NAND, though considered archaic compared to today’s 3D TLC or QLC stacks, is physically larger and tolerates more program/erase cycles. This longevity suggests that many older SSDs in legacy systems may still be viable, potentially extending the useful life of equipment that would otherwise be discarded.

Background on SSD endurance

SSD wear is driven by the number of program/erase (P/E) cycles each NAND cell endures. Early generations, such as the 32 nm MLC used in the P4, have a higher per‑cell endurance than newer, denser technologies. Modern drives often trade raw endurance for capacity and cost, resulting in lower TBW numbers on paper. However, manufacturers deliberately engineer a safety margin; the P4’s 40 TBW rating was set to ensure warranty compliance, not to define the absolute failure point. The WolfyTech test aligns with other independent endurance studies that have repeatedly shown SSDs operating well beyond their rated limits.

Implications for consumers and enterprises

For hobbyists maintaining vintage laptops or netbooks, the findings provide reassurance that a functioning old SSD can still serve as a reliable storage medium. Enterprises with legacy hardware can consider refurbishing rather than replacing drives, especially when the cost of replacement outweighs the risk of unexpected failure. Nevertheless, the article cautions against deliberately pushing any SSD to its theoretical limit, as wear does accumulate and can eventually lead to increased error rates.

Looking ahead

As the storage market continues to shift toward higher‑density NAND, the industry may need to revisit how endurance specifications are communicated. Transparent, real‑world testing—like the WolfyTech experiment—could become a valuable complement to manufacturer datasheets, helping buyers make more informed decisions. Meanwhile, the resurgence of interest in older MLC NAND may inspire niche manufacturers to re‑introduce robust, high‑endurance SSDs for specialized applications such as industrial controllers or edge devices.