感謝回答

我在wiki也找到了一段話

The other type of wear leveling is called static wear leveling which also uses a map to link the LBA to physical memory addresses. Static wear leveling works the same as dynamic wear leveling except the static blocks that do not change are periodically moved so that these low usage cells are able to be used by other data. This rotational effect enables the SSD to operate until most of the blocks are near their end of life.

寫的和你寫的"週期性"的說法是一致的
可惜找不到其它文章有說明SSD controller是如何控制這個週期性
或許是在HDD沒有什麼loading時進行？ 這可能是最不影響效能的方式吧

這個答案讓我開這串主題拿到的答案
看來是不用太擔心這些static data會有那種佔著茅坑不拉●的問題