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

By rodion15
Sep 23, 2015
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  1. 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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