And this is hardly a good idea.
SDcards are famous for wearing down quickly.
Only very limited read/writes can be done on a single block, trust me I wore a couple down back in the days.
Also fucked up plenty of USB sticks by running OS's on them.
Generally bad idea.
These are storage devices and that is what they are good at.
SSD's suffer from the same weakness, thats also a reason not to go for the cheapo ones.