Maybe what the super-vague Toshiba chart is showing is 0 percent chance of losing data retention up PE cycles = rated, increasing chance up to 2x MWI, and a greater chance (greatly reduced retention time) between 2x and 3x rated PE cycles. Once a drive hits 3x rated PE cycles, the chance of retention failure is very high (and or the amount of time rapidly decreases)...
But I don't think it works like that. And the chart could be referring to SLC which is probably quite different from MLC in that respect.
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