On: Edge Computing at Chick-fil-A

[jessaustin]

...the card is highly likely to reuse the same sectors over and over.

One would have expected this to be an area of focus for RasPi developers? Surely some driver could be updated to avoid this?

[walrus01 → jessaustin]

The Linux kernel in raspbian treats the SD card like a normal block device. I'm not aware of any special optimization for write wear leveling at the OS level, or on the board's sd card controller.

[fenwick67 → walrus01]

SD card wear-levelling is usually supposed to be handled on the controller inside the SD card. SD cards aren't like having raw access to flash, you basically write over SPI and the controller in the SD card decides where to actually put it.

This talk about SD cards is really great and explains some of this:

https://youtu.be/r3GDPwIuRKI?t=197

[stavros → fenwick67]

Fantastic talk, thanks for the link!

[monocasa → jessaustin]

Not without making the card unreadable in other systems.

And even then I'd be surprised if you could game physical sector offsets by playing with the virtual offsets you have access to.