Why does emergency mode appear in CentOS 7?

Question

linux

Installed Centos 7 on an Asus laptop. Faced with the problem of loading the OS after turning on the laptop.
After switching on, the text Emergency Mode appears. When you try to boot in standard mode using the Ctrl + D combination, the following message flies again.
I installed the OS on the entire disk, there are no neighboring OSes. Before that there was Windows 7, demolished it.

Answer 1

Usually these are problems with the file system. In the issued diagnostic messages, he reports with which. You need to check this file system with fsck with error correction (for example, fsck -y /dev/sda1).