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These SSDs were never powered off not once. that is the fail in this testing. Endurance is rated for data retention with the power off. Several of the guys who did the initial testing (that this testing is based off of) had SSDs 'die' after one second of power off after they had reached their warrantied writes. If you removed power from any of those SSDs, period, even halfway through that test every single bit of data would be gone.