>>>> Doesn't this affect the expected lifetime for an SSD?
>>>    Little.  AFAIK this used to be a more serious concern on the first
>>> generation of SSDs, because they suffered strongly from write-wear and
>>> because firmware, drivers and filesystems did not support write-levelling.
>>> Today this is much less of a concern.  SSD cells can stand many more write
>>> operations before wearing (not so so called 3D SSD units, however) and
>>> unit's firmware today apply algorithms to write operations that attempt
>>> to spread writes as evenly as possible to cells avoiding impinging too
>>> many times on the same ones.  Which means that, even if you're writing
>>> several times on the same filesystem's blocks (e.g., the FS's log on a
>>> journalled FS), these blocks are mapped to cells spread here and there on
>>> the SSD that are generally different from write operation to another,
>>> transparently to the filesystem's driver and block allocator.  Plus,
>>> SSD-aware filesystems (designed, among other things, to reduce the impact
>>> of write amplification of cells being rewritten) further help prolonging
>>> the unit's life, regardless of how it is used.

>> "SSD-aware filesystems" are flesystems mounted with no atime
>    They do more than that: