Mac OS X contains a variety of tools for repairing disk, partition, and file system errors. These options work like chkdsk on Windows, checking for disk and file system errors and repairing them. You can perform a check from within Mac OS X, but it may sometimes be. Jan 01, 2009 OS X automatically defrags files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X. Disk Drill is the free top data recovery app for Mac OS X. Disk Drill Basic, in addition to having previewing capabilities for recovered files, contains several other functionalities, such as Recovery Vault and Guaranteed Recovery, lost partition restoration, boot disk maker and so on, which make it one of the best Mac data recovery software applications available.
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Modern versions of Mac OS X no longer need you to repair disk permissions. However, that’s not the only issue that can occur with a disk or file system. Mac OS X contains a variety of tools for repairing disk, partition, and file system errors.
These options work like chkdsk on Windows, checking for disk and file system errors and repairing them. 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.
Use “First Aid” in the Disk Utility
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You can perform a disk health check from the Disk Utility application included with Mac OS X. Apple updated this utility’s interface on Mac OS X 10.11 El Capitan, so it’ll look a bit different from the screenshots below if you’re still using and older version of Mac OS X.
To launch it, you can press Command+Space to open Spotlight search, type “Disk Utility”, and press Enter. Or, you can navigate to your Applications folder, double-click the “Utilities” folder, and double-click the “Disk Utility” shortcut.
In the Disk Utility application, select the disk or partition you want to check — the system partition is named “Macintosh HD” by default — and click the “First Aid” button.
You can either run the First Aid function on an entire disk, or an individual partition on that disk. It depends which you select in the sidebar.
Click “Run” and your Mac will check the disk you selected for errors. If it finds any errors, it will attempt to automatically fix them for you.
You can click the “Show Details” drop-down message to view detailed information about any errors it encounters. You’ll 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.
Boot into Safe Mode
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One simple way to fix such errors is to boot your Mac into Safe Mode. Safe Mode, sometimes called “Safe Boot,” contains an automatic startup check and repair that can fix these problems.
To do this, restart your Mac and hold “Shift” while it’s booting. Sign 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.
When it’s done logging in and you see a desktop, the disk check is done. You can reboot your Mac at this point.
Run First Aid in Recovery Mode
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Ideally, that should be the end of it — especially if you used the safe mode trick above. 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 it’s running in “live mode” — examining the disk while the operating system is running from it. It can’t make changes to that system drive while it’s running from it.
The solution is to boot into a special recovery mode. From there, you can use Disk Utility in the same way. Your Mac will be able to fix errors on your system drive from recovery mode.
To do this, restart your Mac. Press and hold the “Command+R” keys while it’s booting. You’ll 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 doesn’t appear, restart your Mac and try pressing the keys again.)
In OS X Recovery, click the “Disk Utility” shortcut to launch the Disk Utility here. Select the drive or partition you need to repair and click the “First Aid” button. The Disk Utility interface is the same one you’ll see on your Mac OS X desktop, but run it from here and it’ll be able to repair problems with your system drive.
Use fsck in Single-User Mode
In some cases, even Safe Mode or Disk Utility in OS X Recovery won’t be enough to fix problems. You may need to boot your Mac into single-user mode and run the fsck (file system check) command the old-fashioned way. You don’t need to do this if any of the above steps worked. This is the thing you should try last, as Disk Utility in the recovery environment may work better and be more capable.
To do this, start your Mac in single-user mode. Restart it, and then press and hold the Command+S keys while it boots.
You’ll enter single-user mode, which will provide you with a text-mode terminal. Type the following command into the terminal and press Enter to start a file system check:
/sbin/fsck -fy
The command will run through several phases of checks. When it’s done, you’ll see a message saying “** The volume [name] appears to be OK” if everything is fine. https://bucksgenerous647.weebly.com/threat-modeling-tool-for-mac.html.
If it found problems, you’ll see a “***** FILE SYSTEM WAS MODIFIED *****” message. 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.
When the fsck command says your disk is okay, type the following command at the terminal and press Enter:
reboot
Your Mac will reboot, returning you to the usual login screen.
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The above steps should only be necessary if you’re experiencing errors with your Mac. Assuming everything is fine, you don’t need to regularly perform disk first-aid checks. However, if you do want to run a check, you can just do it with Disk Utility from within Mac OS X. You don’t need to reboot into any other environments unless there’s an error on a system drive you need to fix.
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If your Mac is only displaying the blue screen when you start up, or you can log in but the desktop fails to appear, you may have a problem with your startup drive. The usual course of action is to run Disk Utility to attempt to repair the startup drive, but you can't do that if your Mac doesn't start, right? Well, here's what you can do.
When a Mac fails to start up normally, one of the common troubleshooting practices is to verify and repair the startup drive. A startup drive that is experiencing problems is likely to prevent your Mac from starting, so you may find yourself in a catch 22. You need to run Disk Utility’s First Aid tools, but you can’t get to Disk Utility because your Mac won’t start.
There are three methods of getting around this problem.
- Booting from a different device: This can be another drive that has a bootable system on it, or your OS X Install DVD, which also contains the Disk Utility tools or the Recovery HD which is a special partition on your startup drive that has been present since OS X Lion and later.
- Safe Mode: This is a special booting method that forces your Mac to perform an automatic disk check and repair as it tries to start up.
- Single User Mode (fsck): This is another special startup method that allows you to run command line utilities, such as fsck, which can verify and repair hard drives.
Boot From Alternate Device
The easiest solution by far is to boot from a different device. The three most popular options are another bootable startup drive, an emergency startup device, such as a bootable USB flash device, or a current OS X Install DVD.
To boot from another hard drive or a USB flash device, hold down the option key and start up your Mac. The Mac OS startup manager will appear, allowing you to select the device to boot from.
To boot from your OS X Install DVD, insert the DVD into your Mac, and then restart your Mac while holding down the letter c key.
To boot from the Recovery HD, restart your Mac while holding down the command (cloverleaf) and R keys (command+r).
Once your Mac finishes booting, use Disk Utility’s First Aid feature to verify and repair your hard drive.
Boot Using Safe Mode
To start up in Safe Mode, hold down the shift key and then start your Mac. Safe Mode takes a while, so don’t be alarmed when you don’t see the desktop right away. While you’re waiting, the operating system is verifying the directory structure of your startup volume, and repairing it, if necessary. It will also delete some of the startup caches that may also be preventing your Mac from starting successfully.
Heidelberg speedmaster 74 for sale. Once the desktop appears, you can access and run Disk Utility’s First Aid tool just as you normally would. When First Aid is finished, restart your Mac normally.
Please note that not all applications and OS X features will work when you boot into Safe Mode. You should use this startup mode only for troubleshooting and not for running day-to-day applications.
Boot Into Single User Mode
Start your Mac and immediately hold down the command key plus the letter s key (command+s). Your Mac will start up in a special environment that looks like an old-fashioned command line interface (because that’s exactly what it is).
At the command line prompt, type the following:
Press return or enter after you type the above line. Fsck will start and display status messages about your startup disk. When it finally finishes (this can take a while), you will see one of two messages. The first indicates that no problems were found.
The second message indicates that problems were encountered and fsck attempted to correct the errors on your hard drive.
If you see the second message, you should repeat the fsck command again. Continue to repeat the command until you see the “volume xxx appears to be OK” message.
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If you don’t see the volume OK message after five or more attempts, your hard drive has serious problems that it may not be able to recover from.