{"id":1826,"date":"2020-01-01T09:30:46","date_gmt":"2020-01-01T14:30:46","guid":{"rendered":"http:\/\/shirishranjit.com\/blog1\/?page_id=1826"},"modified":"2020-01-01T10:34:29","modified_gmt":"2020-01-01T15:34:29","slug":"mac-os-x-references-for-restart","status":"publish","type":"page","link":"https:\/\/shirishranjit.com\/blog1\/technical-posts\/mac-os-x-tidbits\/mac-os-x-references-for-restart","title":{"rendered":"Mac OS X References for Restart"},"content":{"rendered":"

1. Try Safe Mode<\/h2>\n

To boot into Safe mode:<\/strong> Turn your computer off, then press and hold the Shift<\/strong> key while your computer boots. If your computer has hung on boot, shut it down by holding the power button until the machine switches off (around 10 seconds) first.<\/p>\n

2. Recovery Mode and First Aid<\/h2>\n

To boot into Recovery mode:<\/strong> Turn your computer off, then press and hold Cmd + R<\/strong> while your computer boots.<\/p>\n

If you have trouble booting into Recovery mode, perhaps due to problem with your drive, you can start recovery mode from the internet by holding Cmd + Option + R<\/strong> instead. Keep in mind this requires an internet connection and will take a lot longer, since macOS needs to download the image first.<\/p>\n

Once you\u2019ve booted into Recovery mode, you\u2019ll see a few options. Launch Disk Utility<\/strong> and then isolate the drive that\u2019s causing problems\u2014it\u2019s probably labeled Macintosh HD<\/strong>. Select it from the list on the left, then click First Aid<\/strong> followed by Run<\/strong>.<\/p>\n

3. Use fsck in Single User Mode<\/h2>\n

File system consistency check (or fsck<\/a> for short) is a longstanding Unix tool for checking and fixing drive problems.<\/p>\n

Depending on the size of your volume, the type of drive you have installed, and the potential problem, fsck can take a while to complete. Patience and persistence is important if you want to fix your drive this way.<\/p>\n

To run fsck, you\u2019ll need to boot into Single User mode. This boot mode allows you to make changes to shared user resources. Single User mode doesn\u2019t attempt to boot macOS; it only provides access to a Unix command line.<\/p>\n

To boot into Single User mode:<\/strong> Turn your computer off, then press and hold Cmd + S<\/strong>when your computer boots. You\u2019ll soon see a command line prompt. You can type fsck -fy\u00a0<\/strong>to run fsck.<\/p>\n

<\/h2>\n

Reference<\/h2>\n