Apple Service Diagnostics 3S156 And Earlier (2013) (Mac OSX) | 38.1 GB Apple Service Diagnostic tests the hardware for correct operation. Apple Service Diagnostic (EFI) performs low-level tests of hardware directly and does not require an operating system to run. Apple Service Diagnostic OS tests use an OS X operating system to perform tests. Building the bootable USB drive Refer to Creating a ASD USB Bootable Drive.pdf document.
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