On Tue, 23 Feb 2021 18:30:40 -0800 (PST), in gmane.comp.hardware.beagleboard.user ha ppay <andocn777-re5jqeeqqe8avxtiumw...@public.gmane.org> wrote:
>Hi Dennis Bieber > >Thank you for the detailed explanation of the SD card standard (class) and >features. > >>The SanDisk Class 4 was easily 8 times faster than the Kingston Class >>10 for regular write, rewrite, and random write, and was also faster (if >>not as much) for read/reread/random read. >We will use it as a reference when selecting an SD card. >It turns out that like SD cards, MMCs have completely different transfer >rates. >>https://en.wikipedia.org/wiki/MultiMediaCard#Table >so many version... >Is the transfer speed of MMC completely different like SD card? > I would suspect the primary factor is the on-chip /controller/ section -- which is responsible for handling the erasure/reuse of allocation units. There may be some effect if the flash memory itself is NAND or NOR type. See https://www.pidramble.com/wiki/benchmarks/microsd-cards While that site is focused on the Raspberry Pi, the benchmarks WILL run on a Beaglebone (though one test won't run on the eMMC -- the script is still trying to access the SD card for that test). -- Dennis L Bieber -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/gfkb3gh4ofeijbftq6r8ade5nc8g0mgt7u%404ax.com.
