SSD Write Endurance 25nm Vs 34nm

[johnw]

Yes, but the Samsung's factory reallocation was evident in the SMART data. The M4 doesn't have any, so that's still impressive whether factory bad block invalidations are invisible to smart data or not... its still awesome.

It is a rather arbitrary choice whether to include factory failed/reallocated blocks in the initial SMART attribute values. Samsung apparently chose to include it. Perhaps Micron chose not to.

I don't think it is necessarily "awesome" compared to the other SSDs. It is likely they have similar quality of flash, but some have just chosen to fail the marginal blocks early, and others have chosen to let the marginal blocks be used until they fail, which they tend to do earlier than the other blocks. Either way, the longevity of the SSD is primarily determined by the longevity of the vast majority of the flash blocks, not by a small number of marginal blocks that may or may not be counted as reallocated sectors during the early part of the SSD's lifetime.