Your Mac failed to display the login screen after booting.As the command line suggests, you need to run fsck manually. If the Mac boots up partially and then shows a message asking you to run fsck, then this usually displays a command-line prompt, indicated by a number sign (#).So if you notice the following signs upon startup then your Mac may have encountered issues with the file system and it needs repairing. The Mac will signal the use of fsck if it has run into issues and needs your attention to fix them. As any command can make changes to a file system, so you need to be careful when using the fsck command.

However, running fsck requires the familiarity of the command-line interface. So you can run fsck manually to check your Mac internal disk or external hard drive and repair it if any problem has been found. The main function of fsck is to check and repair file system problems. And there is a similar command named CHKDSK existing in Microsoft Windows and its ancestor, MS-DOS. How to use fsck on Mac to repair a hard driveįsck (file system consistency check) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux and macOS. This post tells you how to run fsck on Mac to repair the internal and external hard disks and related information about the fsck command. Is this annoying you sometimes? Your MacBook fails to boot or Mac is stuck on the loading screen due to a corrupted startup volume or your external hard disk can't work normally because of file system issues.ĭon't panic.

Mac terminal commands for check disk