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.
