In article , tony sayer
writes

Are these more reliable now

Yes. Early ones were a bit dodgy.

or was it a problem with the number of read
write cycles they had a problem with?..

No longer an issue due to a feature called wear levelling, which
distributes data around the flash chips so no one chip gets an excessive
number of writes.

The firmware also allocates about 7% of the capacity as spare sectors
(hard drives do the same thing), so as flash cells fail they can be
replaced on-the-fly.

All this is transparent to the OS and the user.

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