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I have heard that NAND flash can wear out over time. What happens if the NAND component in the Toshiba SSHD reaches its endurance limit? Will data be lost?

Should the user exceed the endurance limit of the NAND flash, the Toshiba SSHD will continue functioning as a conventional HDD. However, before the NAND flash component reaches the endurance limits, its performance will gradually decline. Due to Toshiba’s NAND flash caching algorithms and data protection mechanisms, Toshiba does not expect an increased risk of data loss resulting from aging of the NAND flash on the Toshiba SSHD during the expected lifetime of a PC.

其他網也有類似討論，我的結論是：當效能降低，而 SMART 又沒有任何錯誤訊息，就有可能是 SSD cache 已經有足夠多的損壞，導致快取容量減少，進而影響效能。

詳細請參考 SSHD will function as normal Hard Drive when the SSD Cache wear out