Generally SLC cache has almost no connection to the overall size of the drive. After finishing writing a huge portion of data (for example), the controller will start to move the written data out of the SLC section and turn them into normal TLC mode, releasing the SLC space for next turn of writing. When the drive usage becomes higher, some drive (apparantly Samsung's drive does) have a dynamic SLC capacity policy that will reduce the avaliable SLC space, so the disk can have enough space to store normal TLC data.
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