However, if you do want to run a check, you can just do it with Disk Utility from within Mac OS X.However, thats not the only issue that can occur with a disk or file system.
Sierra For Coding Mac OS X![]() You can perform a check from within Mac OS X, but it may sometimes be necessary to use recovery mode to fix problems. In a worst-case scenario, you may have to manually run fsck commands from a terminal in single-user mode. Or, you can navigate to your Applications folder, double-click the Utilities folder, and double-click the Disk Utility shortcut. If it finds any errors, it will attempt to automatically fix them for you. Youll see messages like Storage system check exit code is 0 and File system check exit code is 0 here. An exit code of 0 is a good thing, and means no errors were found. Safe Mode, sometimes called Safe Boot, contains an automatic startup check and repair that can fix these problems. Sierra For Coding Password And YourSign in with your password and your Mac will then check your disks. This will make the login process take longer than normal, so be patient. However, in some cases, your Mac may find disk or file system problems and be unable to repair them when you perform the above steps. This is because its running in live mode examining the disk while the operating system is running from it. It cant make changes to that system drive while its running from it. Your Mac will be able to fix errors on your system drive from recovery mode. Youll see a progress bar appear, and you can release the keys after you do. Your Mac will load straight into recovery mode. If recovery mode doesnt appear, restart your Mac and try pressing the keys again.). Select the drive or partition you need to repair and click the First Aid button. The Disk Utility interface is the same one youll see on your Mac OS X desktop, but run it from here and itll be able to repair problems with your system drive. This is the thing you should try last, as Disk Utility in the recovery environment may work better and be more capable. Restart it, and then press and hold the CommandS keys while it boots. Type the following command into the terminal and press Enter to start a file system check. When its done, youll see a message saying The volume name appears to be OK if everything is fine. This indicates the fsck command found and fixed problems. The fsck command may find additional errors after repairing the first batch of errors, so Apple recommends you run the fsck command again if it found and fixed problems. Run the above fsck command over and over until you see a The volume name appears to be OK message. Assuming everything is fine, you dont need to regularly perform disk first-aid checks.
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