First Aid on the logical volume under the physical disk:

Running First Aid on â  Mac Backup 06â   (disk3)

Verifying storage system
Performing fsck_cs -n -x --lv --uuid B18BE0E8-F1B9-4F03-8186-A56FAF2B3A05
Checking volume
disk2s2: Scan for Volume Headers
disk2s2: Scan for Disk Labels
Logical Volume Group B18BE0E8-F1B9-4F03-8186-A56FAF2B3A05 on 1 device
disk2s2: Scan for Metadata Volume
Logical Volume Group has a 24 MB Metadata Volume with double redundancy
Start scanning metadata for a valid checkpoint
Load and verify Segment Headers
Load and verify Checkpoint Payload
Load and verify Transaction Segment
Incorporate 0 newer non-checkpoint transactions
Load and verify Virtual Address Table
Load and verify Segment Usage Table
Load and verify Metadata Superblock
Load and verify Logical Volumes B-Trees
Logical Volume Group contains 1 Logical Volume
Load and verify DC7E9170-509A-4B8E-9043-CAEA97CD76F3
Load and verify 4B79F0B4-80EC-407F-BAE1-8FB44EC10E09
Load and verify Freespace Summary
Load and verify Block Accounting
Load and verify Live Virtual Addresses
Newest transaction commit checkpoint is valid
Load and verify Segment Cleaning
The volume B18BE0E8-F1B9-4F03-8186-A56FAF2B3A05 appears to be OK
Storage system check exit code is 0.
Repairing file system.
Volume is already unmounted.
Performing fsck_hfs -fy -x /dev/rdisk3
File system check exit code is 8.
Restoring the original state found as unmounted.
File system verify or repair failed. : (-69845)

Operation failedâ ¦