How do I fix boot disk/startup disk with Disk Utility in Mac OS X?

You must be aware of disk repairing app named Disk Utility that can help in deleting the corrupted disk, repairing disk permissions or scanning the connected drivers for detecting any error. When your Mac has stopped to boot or have problems while booting, you can utilize the recovery mode to undo malfunctioning startup disk or boot disk. Your Mac OS X can be booted properly, if you apply the procedure as suggested below. Here are the right steps to Repair Boot Disk or Startup Disk:

1.    You can try Starting Mac in Recovery mode: In order to start your Mac OS X in recovery mode, you need to press command and R key simultaneously. When the booting procedure completes, you will be see a utility screen. There, you must choose Disk Utility and proceed towards Menu and select Startup Disk which you want to repair. Thereafter, click on First Aid and move to the next step. And then, Disk Utility will repair the boot disk automatically. This whole process will take some time. The Apple Support Number UK will be the right option for all your problems.

2.  Running Repair Boot Disk Function will be a right option: When you are completed with booting Mac in recovery mode, you need to run the repair function. When Mac gets booted into Recovery mode, you just press Command and R keys simultaneously to boot your Mac in recovery mode, and then select Recovery HD option. For initiating the repair process, just click on Repair Disk and it will take few minutes to be completed.

3.  Go for First Aid Repair Process on your startup drive: The steps for First Aid Repair are as follows:

·   Press Command and R keys to boot from Recovery HD volume which will show up with OS X utility screen.

·       Now, choose Disk Utility and click on Continue.

·  On the Disk Utility window, click on First Aid to select that function of Disk Utility.

·   Now, click on the icon of your boot hard drive in the Disk Utility screen.

·  Click on Repair Disk button and shut down Disk Utility by clicking on “Quit Disk Utility”.

4.    Repair Disk errors when in the recovery mode: Try to repair Disk errors in the recovery mode by following the below given steps:

•      Open Apple menu and select Restart option.

·  When Mac restarts, you need to press the Command and R keys simultaneously.

·       You will be appeared with utility screen and select Disk Utility and then Continue option.

·       Now, go to the sidebar and select the volume you want to repair.

·       Thereafter, click on First Aid button and then tap on Repair Disk.

When the Issue is still not resolved, don’t get worried and try another method of calling the experts at MacBook Customer Care Number UK and get guided for all your queries. The experts are really helpful and will guide you against every confusing situation.

What is Disk Permission and How to Repair Disk Permission in Mac?

Mac disk permission keeps your files safe and secure. Permissions are file settings that decide which user and system can access that file and what they can do with it. Thus, a certain program cannot affect any other system file and modify them without asking for permission. The files and folders that your Mac has, comes with a particular set of permission, but these permissions sometimes get messed up because of installing and uninstalling of other apps. This is when the user needs to repair them otherwise they will face various issues with their system like lagging, freezing and crashing.

You can contact professional technicians on MacBook Help Number UK to troubleshoot these file permissions or you can try the given methods. We are going to discuss two different ways for this purpose.

Manual Method

For Mac OS older version, Disk Utility is a go-to tool for fixing issues. Mac operating system comes with a feature known as SIP (System Integrity performance) which can easily repair file permission which performing software update and system changes. It restricts the root account so that it cannot modify protected locations and have control on /System and /user. With it, no malware could infect your system.

If you are using an older version than EI Captain then you can follow the given steps to use Disk Utility:

• Tap on Command and Space Simultaneously to open Spotlight.
• Then type “Disk Utility” and press enter.
• Now select Macintosh from the left menu and then click on First Aid tab.
•  After that, click on verify Disk Permission. This will make Disk Utility go through the hard drive to detect any broken permission and then repair them.
• Then click on Repair Disk permission and let the tool finish fixing it. 

Easy Method

If you are using Mac OS EI captain version or newer then you can use CleanMyMac3 tool for repairing disk permission. The tool works like Disk Utility and it verifies your permission and repairs Mac’s disk.

• Download and install Clean My Mac tool. You can take help for this from our customer care executives on Apple help Number UK.
• Double-click Clean My Mac file to launch it and then go to its Maintenance tab from the left menu.
• Tick the box next to Repair disk permission and click Run.

The tool will scan your system to verify disk permission and if in case there is any flaw then it automatically fixes it. After this, your Mac will run as smoothly as it should.

Source:- 

https://moxycaster.wixsite.com/apple/blog/what-is-disk-permission-and-how-to-repair-disk-permission-in-mac