On 10/23/2019 07:51, Areligious Republican wrote:
> I read somewhere (forgotten where) yesterday that the SD card in a
> RPi malfunctions because log files (which nobody reads anyway)
> wear out the write count on the card and so one has to keep
> a stock of SD cards to hands with the OS already on.
>
> How true is this?

You will never wear out a uSD card from writing to it.  From the SanDisk
SD Card Product Manual.

https://www.manualslib.com/manual/587744/Sandisk-Sdsdb-016g-A11.html


> 1.8
> Endurance
> SanDisk SD cards have an endurance specification for each sector of 100,000
writes typical
> (reading a logical sector is unlimited). This far exceeds what is typically
required in almost
> all SD Card applications. Therefore, extremely heavy use of the card in
cellular phones,
> personal communicators, pagers and voice recorders will use only a fraction
of the total
> endurance over the device's lifetime. For instance—it would take over 10
years to wear out
> an area on an SD Card based on a file of any size (from 512 bytes to maximum
capacity)
> being rewritten 3 times per hour, 8 hours a day, 365 days per year.
> With typical applications, the endurance limit is not of any practical
concern to the vast
> majority of users.
> 1.9
> Wear Leveling
> Wear leveling is an intrinsic part of the erase pooling functionality of the
SD Card, using
> NAND memory. The Wear Level command is supported as a NOP operation to
maintain
> backward compatibility with existing software utilities



--

Knute Johnson

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