When should ASD EFI and ASD OS used to test macs? What's the real difference?

rodion15

Posts: 165   +2
I know ASD OS is a sort of OS X that does extensive tests and ASD EFI is a slimmer version.
Don't both load into RAM and execute from RAM?
I can't image ASD EFI loading into the flash memory in the motherboard, why is it called EFI then?
Example: What's the difference between doing a memory test with ASD EFI and ASD OS?
 
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