

To ensure a risk-free procedure certain measure should be taken:


It provides the user access to the contents of the internal drive, assuming the data is safe and not corrupted. Using an external source like the USB drive helps the user get around the problem. The likeliest of the reason for choosing the boot from the USB method is that your Mac won't start which denies the user access to the computer. How to Recover Data from Unbootable Macīooting the Mac from USB in a way gives the power back to the user.
