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Succeed to repair the external hard drive, use a Mac data recovery software to

On the prompt, type fsck_hfs вЂ“y /dev/disk4s1 and hit Return.ДЇsck command.

Promptly press and hold Command + S keys. Mode to repair the file system corruption issue on your Mac external hard drive.Дrive by using single-user mode are as follows: Use FSCK Command in Single-User Mode to Fix External Drive

Use the fsck command again until it says, вЂњThe volume appears to be OK.вЂќДЄlso Read: List of Top 5 Mac Hard Disk Drive Repair Software 2.

If you receive the message вЂњFile system was modifiedвЂќ, re-run the above fsck command.

The parameter -y repairs any damage that is found. If the external storage drive is in the apfs format, use fsck_apfs instead of fsck_hfs. The fsck_hfs verifies and repairs hfs containers and volumes.

Type fsck_hfs -y /dev/disk4s1 and hit Return.

This command unmounts the external drive.

Type unmount /dev/disk4s1 and hit Return.

Note down the file system identifier of the external hard drive, say /dev/disk4s1.

In the Terminal window, type df вЂ“h and hit Return.

Go to Finder > Applications > Utilities > Terminal.

System consistency check) command in the macOS Terminal. The file system corruption issue on your Mac external hard drive, run the fsck (file Use FSCK Command in Terminal to Repair External Hard Drive To repair Mac storage drive without Disk Utility. The next sections describe numerous methods Not un-mount due to running programs that are accessing the drive, forced Storage drive without proper un-mounting may result in an incomplete write Results in non-syncing of information to the file system, which results in its System of the drive turns bad, then the storage drive fails.ДЇile system space, thus crippling drive access.ДЇile-system formatted storage drive are as follows: The storage driveвЂ™s file system, which may not get fixed with Disk UtilityвЂ™sДЇile system thereby causing corruption on the disk. Storage and retrieval of data to and from the storage drive. Have multiple volumes with their file systems. Space manager area, and storage for objects and file data. The APFS container comprises Container superblock, Checkpoint area, Reserved space for GUID Partition Table, EFI System Partition, and APFSД¬ontainer. The drive and its stored data inaccessible on Mac. This logical damage of the external hard drive makes Why Mac External Hard Drive TurnsД¬orrupts the partition table, EFI partition, or APFS/HFS file system of the MacД®xternal storage drive. The Mac file system and its importance, and learn the reasons that lead to file Recovery methods, know why a Mac external hard drive turns inaccessible, appreciate Also, you can recover data from a corrupt external drive on Mac. DonвЂ™t worry, you can use alternative methods to repair your Mac external hard drive in case Disk Utility doesnвЂ™t work. But sometimes, Disk UtilityвЂ™s First Aid fails to repair your external hard drive and the driveвЂ™s data remains inaccessible. Recover Inaccessible Data Using Mac Data Recovery SoftwareДisk Utility is a useful storage drive management software that allows you to perform the external hard drive repair task with ease by using First Aid. Use FSCK Command in Single-User Mode to Fix External DriveДЈ. Use FSCK Command in Terminal to Repair External Hard DriveДў. Summary: In this blog, weвЂ™ll share a variety of alternative methods to repair your Mac external hard drive in case Disk Utility fails to fix the drive.Дownload the free-to-try Mac data recovery tool to recover data from an external hard drive.