Hardware Reference
In-Depth Information
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SanDisk indicates that the 4 MB zones may change with future memory
capacities.
Note
Other manufacturers may not implement wear leveling at all or use a lower level
of overprovisioning. Wear leveling is not specified in the SD card standard, so no
manufacturer is compelled to follow SanDisk's lead.
Note that wear leveling applies to read/write file systems. If the file system is
mounted read-only, no erase and program operations are occurring inside the card.
So no “erase wear” is taking place. But do take into account all of the mounted partitions
on the same media.
If you are using your Raspberry Pi for educational purposes, you can probably ignore
the issue. However, using known brands like SanDisk can provide you with additional
quality assurance. Consider also the advantage of documented overprovisioning and
wear leveling characteristics.
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Some brands of SD cards have been reported not to work with the raspberry
pi, so the brand/product issue cannot be totally ignored.
Caution
