agree with the sandisk model but not with the rest.
windows can and will use the extra memory, it just has to be setup correctly
second, if you have a slow emmc, chances are cloning the whole emmc to the usb and the make it the primary boot drive will make the pc faster since most fast usb3 outperform slower emmc.
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks