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It is quite common for two microSD cards of the same nominal size to have slightly different capacities. The "SD card copier" function that's part of the "Accessories" sub-menu will compensate for differences in card sizes provided the destination card has room for all the data on the source card. In your case, that should be no trouble at all. For ...


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Given that you are time-constrained, I'd suggest that using the "SD card copier" function in "Accessories" is the path of least resistance. In the future, you probably want to plan to build a "master image" and use some other tool to duplicate the image. I have had pretty good success with building my images on 8GB cards, then flashing them to bigger cards....


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Unsurprisingly, the bus supporting SD cards is called SD bus. There is a spec for it if you're interested. The SoC of RPi 3 implements two controllers for this bus: one is connected to the microSD slot, and the other one to the WiFi controller in SDIO mode. The Linux driver for SD/MMC/SDIO devices is called mmc, and it does provide access to the hidden ...


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Cloning an image is quite acceptable. Indeed I use this to make images for my various Pi (although I use other techniques to keep them in sync). The Answer discusses the merits of 4 different approaches. The SD card copier is one of these, but not a method I would use to make 6 copies. The technique I use is to make an image which can then be used to ...


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any changes to this file are lost when I remove the SD card This may be a sign of your SD card reaching end of life. Well-behaved cards become read-only when this happens, so that you can recover the data that's already on them, instead of trashing that data with failed write operations. If you are absolutely positive you can't write to the SD card any ...


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