>Is this the reason that my old mid/low end android devices become unusable even through they no longer get updates?
More recent versions of apps (like whatsapp, which requires to be updated regularly) are unnecessarily more demanding. Try disabling Play services, all Bloatware, all quasi-bloatware (calendar, contacts), all the way to the default keyboard. (pm disable-user --user 0)
Install FOS replacements with no internet connectivity, e.g. from f-droid and such (not affiliated)
It is easier to buy a new device, but I get attached to my pal ;)
Has Android gotten that bad? I last used it in 2018, and haven't exactly missed it since, but even back then I didn't think of Calendar or Contacts as quasi-bloatware.
Most of the memory in a phone is flash. All flash memory has limited write cycles and there's a speed/lifetime tradeoff, also. Flash devices normally actually have more memory than stated, writes go to empty pages that then replace the original, which is then wiped. Every cycle the cell grows slightly weaker until one day it's too weak.
In the best case when a page write fails the memory controller discards the page from the pool, when the pool becomes exactly equal to the official size the device goes into permanent read-only mode. (Which would brick any device it's built into. A PC you could pop in another drive, a phone you can't.) Many devices have failure modes worse than this.
The better the quality of the memory the more margin it has, and how much you write to a drive has little to do with how big it is--from a practical standpoint life expectancy is roughly linear with size.
>from a practical standpoint life expectancy is roughly linear with size.
For the flash itself (the giant mass of NAND or NOR gates making up the cells), in terms of TBW it's straight up linear with size. 2 TB flash storage has twice as many cells as a 1 TB (of the same make) therefore can eat twice as many write cycles (unless the manufacturer does something on the sly like change overprovision ratio based on capacity, change from TLC to QLC on higher capacity units and "forget" to mention it, etc., but those are factors beyond the basic logic gate arrays).
However I don't think size effects MTBF as that looks at factors unrelated to write cycles; things like catastrophic failure of a chip or a short that catches fire and burns down the server farm.
Realistically speaking, MTBF has little bearing when considering flash storage lifetime. TBW is where it's at. If the specs only give MTBF, I tend to assume the TBW is bad enough it's worth hiding and I'll avoid those . If not that, then it's either straight incompetence, recycled flash scam, or the manufacturer just doesn't give a shit (all of which are way worse than choosing to omit a low TBW rating).
It may seem like i'm nitpicking the word 'roughly' but i don't disagree with the sentiment. Depending on how you want to measure lifetime (jfc don't use MTBF), it isn't exactly linear, but it's not the flash's fault.
