jdmiles wrote:
This is out of my Canon 5D Mark IV manual
"When the card is formatted, all images and data on the card will be erased. Even protected images will be erased, so make sure there is nothing you need to keep.....
Since low-level formatting will erase all recordable sectors on the SD card, the formatting will take longer than normal formatting."
On the Mark IV low level formatting is only available on the SDHC slot.
The thing to remember is that writing on these cards is semi-destructive in that only so many writes can be performed.
This is out of my Canon 5D Mark IV manual br "... (
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It is true about the limited R/W cycles however (1) that number is high something like 100,000 typ and (2) the memory manager should be managing the memory so that all sectors see equal use. It’s really not a problem for a photographer’s SD card it’s more of a concern for memory use where there is a lot of read write activity.
There is a technical discussion and more info here if you are interested.