I have a serious problem with my TimeMachine external 8TB Seagate. It has been used as my TimeMachine disk. Did a full backup, installed lastest OS X from scratch and the external disk will no longer mount. My pictures are on this disk. Here are the commands I have run to try and fix this. I don't want to use DiskWarrior or any other Thirdparty software.
diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *250.1 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk1 124.7 GB disk0s2 3: Microsoft Basic Data DEBIAN 124.5 GB disk0s3 4: Apple_Boot Recovery HD 650.0 MB disk0s4
/dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +124.7 GB disk1 Physical Store disk0s2 1: APFS Volume OSX 21.4 GB disk1s1 2: APFS Volume Preboot 22.9 MB disk1s2 3: APFS Volume Recovery 512.0 MB disk1s3 4: APFS Volume VM 20.5 KB disk1s4
/dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *8.0 TB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_CoreStorage Seagate 8.0 TB disk2s2 3: Apple_Boot Boot OS X 134.2 MB disk2s3
/dev/disk3 (external, virtual): #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Seagate +8.0 TB disk3 Logical Volume on disk2s2 784988D6-B233-4BFC-AB1C-45EA7FF24640 Unencrypted
sudo fsck_hfs -l /dev/disk3
** /dev/rdisk3 (NO WRITE) Executing fsck_hfs (version hfs-407.50.6). ** Performing live verification. ** Checking Journaled HFS Plus volume. The volume name is Seagate ** Checking extents overflow file. Invalid leaf record count (It should be 190 instead of 192) ** Checking catalog file. Invalid sibling link (4, 318227) ** The volume Seagate was found corrupt and needs to be repaired.
sudo fsck_hfs -r
** /dev/rdisk3 Executing fsck_hfs (version hfs-407.50.6). ** Checking Journaled HFS Plus volume. The volume name is Seagate ** Checking extents overflow file. Invalid leaf record count (It should be 190 instead of 192) ** Checking catalog file. ** Rebuilding catalog B-tree. ** The volume Seagate could not be repaired.