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Apple Computing Products:
macOS - Operating System
Total System Maintenance
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<blockquote data-quote="Brown Study" data-source="post: 406749" data-attributes="member: 3889"><p>A longer explanation:</p><p></p><p>The overnight cron jobs — daily, weekly, monthly — are simply text-file updates.</p><p></p><p>File repairs such as those done by Disk Utility and DiskWarrior need to be run from an external source because a running system can't perform it's own brain surgery.</p><p></p><p>fsck -fy (file-system check; force because the system is journaled; yes, do each without asking my permission whether to fix each one) is the command that Disk Utility uses.</p><p></p><p>If you have only one OS X partition, the external source to fix any errors could be the DVD. If you have a second OS X with Disk Utility on an external, bootable disk or another bootable partition, it could be run from that.</p><p></p><p>But if you boot your machine in single-user mode (holding down the Command key and "s" key as it boots), the system stops loading before the GUI comes into play. At that point, typing fsck -fy is the same as running Disk Utility's repair function from the DVD because the yet-to-be-loaded GUI is external to the repair mechanism.</p><p></p><p>The free Applejack does a host of repair and maintenance tasks this way, and is well worth the price. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Brown Study, post: 406749, member: 3889"] A longer explanation: The overnight cron jobs — daily, weekly, monthly — are simply text-file updates. File repairs such as those done by Disk Utility and DiskWarrior need to be run from an external source because a running system can't perform it's own brain surgery. fsck -fy (file-system check; force because the system is journaled; yes, do each without asking my permission whether to fix each one) is the command that Disk Utility uses. If you have only one OS X partition, the external source to fix any errors could be the DVD. If you have a second OS X with Disk Utility on an external, bootable disk or another bootable partition, it could be run from that. But if you boot your machine in single-user mode (holding down the Command key and "s" key as it boots), the system stops loading before the GUI comes into play. At that point, typing fsck -fy is the same as running Disk Utility's repair function from the DVD because the yet-to-be-loaded GUI is external to the repair mechanism. The free Applejack does a host of repair and maintenance tasks this way, and is well worth the price. :) [/QUOTE]
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Apple Computing Products:
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