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if your Mac has a strange behavior after sustaining a power cut or a hard restart.

Perform a thorough disk check in case any of the below symptoms become evident: Fixing these errors is important to ensure your Mac’s smooth performance. If your machine has sustained improper shutdowns, unexpected power cuts or system crashes, it may experience the system errors or disk directory deprecation.

So, why do you need to repair your Mac’s hard disk? Meanwhile, most users will launch Disk Utility if their computer won’t start properly. The Terminal-savvy Mac owners will choose in favor of the command-line fsck utility.

Users of Mac OS X have two major utilities to verify and repair hard disks or their MacBook Air/Pro and iMac: Disk Utility and fsck.