In Single User Mode(SUM) you need to first mount USB or external drive to copy data over to it. The only way your Mac can boot for sure is “Single User Mode”. But there is still a way to boot your Mac and recover data from there. You can’t boot your Mac and can’t copy the data over to an external hard drive or USB disk.
In such situations, your important data is at stake. This article is specially written for those who are unable to boot their Mac in normal mode or Mac boot process stuck at grey screen with Apple logo and a loading bar.
