Re: OT: Insight into speed of dd seeks and skips
On 19/09/2025 08:07, rhkramer wrote:
I have to read:
https://web.archive.org/web/20140806023041/https://wiki.linaro.org/WorkingGroups/KernelArchived/Projects/FlashCardSurvey
... at least once more -- i'm not sure my approach to writing something
in each GB of the card will work as there are a lot of twists and turns
that determine where things actually get written.
Concerning low level details of flash memory you may read in addition
(mutually linked articles)
<https://lwn.net/Articles/428584/>
Arnd Bergmann. Optimizing Linux with cheap flash drives. 2011
Writing at random blocks (with seed saved somewhere) might help to
discover insufficient capacity faster (alternating bunches of writes and
reads of some earlier written blocks).
However if probability to face fake capacity is high enough then be
ready to discover excessive bitrot rate. Data may be severely damaged
after a few months.
The reality is that cost of proper quality control may be comparable to
production cost. "Overprice" due to a brand may be reasonable.
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