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The above message doesn’t show up in normal circumstances of disk errors.
In most cases, the disk utility is vigorous enough to verify & repair your Apple hard drive.
It will help you fix Invalid B-tree node problem occurred on the disk drive.
It will further resolve errors like – 3) Fix Mac disk using Stellar Volume Repair Though helpful, fsck isn’t the sure shot method to repair corrupt external/internal hard drive.
1) Backup Data You can try copy and paste all files from the corrupt external or internal hard drive to another destination.
But doing this may also result in copying errors to another location.
To repair Mac startup drive, use steps: Step 1) Launch Stellar Volume Repair to create a bootable USB media.
You can go through the process of bootable USB creation here. Choose bootable USB created through Stellar Volume Repair.
Click Repair button to repair corrupt directory of the startup disk drive.
A word of advice: Resizing mounted boot volumes isn’t always the best idea in the world because there’s a tiny potential something could go wrong.
Before you go messing around and resizing your partitions, be sure to backup your data using Time Machine or whatever other backup service you prefer and make a recent back up.
Disk Utility is even accessible from Recovery Mode, so you can partition your Mac’s hard drive without having to create and load up any special bootable tools.
To access the Disk Utility in mac OS, just press Command Space to open Spotlight search, type “Disk Utility” into the search box, and then press Enter.
To run fsck command you have to restart Mac and log in as ADMIN. Use of df-h1 will let you know the path of the internal disk drive.