Cross-check incoerente sulla partizione HFS +, impossibile da riparare

Ho un disco rigido da 1 TB con due partizioni crittografate, una per le cose a caso e una per il backup di Time Machine.

Dopo aver riorganizzato alcuni dati, ho eseguito un controllo Utility Disco su di esso.

Apparentemente la partizione della macchina del tempo è stata danneggiata, l'utilità del disco mi ha detto di eseguire il S.O.S dall'unità di ripristino, ma non ha funzionato.

Questo è l'output di diskutil list /dev/disk2 :

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:          Apple_CoreStorage Backup                  499.9 GB   disk2s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk2s3
   4:          Apple_CoreStorage Data                    499.8 GB   disk2s4
   5:                 Apple_Boot Boot OS X               134.2 MB   disk2s5

E l'output di sudo fsck_fs /dev/disk2s2 :

   Executing fsck_cs (version 546)
** Checking volume
** disk2s2: Scan for Volume Headers
** disk2s2: Scan for Disk Labels
** Logical Volume Group 9438339C-2B92-48CE-A671-112C7D7ED26C 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 8BA6B22C-6BEC-4F31-9F8E-2DE15736B7FC
** Load and verify 1C2D8BDD-2097-420D-B07E-57237492C1B0
** Load and verify Freespace Summary
** Load and verify Block Accounting
   Unable to bootstrap transaction group 4124: inconsistent crosscheck
Invalidate transaction group? NO
** Continue scanning metadata for an older 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 8BA6B22C-6BEC-4F31-9F8E-2DE15736B7FC
** Load and verify 1C2D8BDD-2097-420D-B07E-57237492C1B0
** Load and verify Freespace Summary
** Load and verify Block Accounting
   Unable to bootstrap transaction group 4123: inconsistent crosscheck
Invalidate transaction group? NO
** Continue scanning metadata for an older 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 8BA6B22C-6BEC-4F31-9F8E-2DE15736B7FC
** Load and verify 1C2D8BDD-2097-420D-B07E-57237492C1B0
** Load and verify Freespace Summary
** Load and verify Block Accounting
   Unable to bootstrap transaction group 4122: inconsistent crosscheck
Invalidate transaction group? NO
** Continue scanning metadata for an older checkpoint
** Load and verify Segment Headers
** Load and verify Checkpoint Payload
** Load and verify Transaction Segment
** Load and verify Transaction Segment
** Load and verify Transaction Segment
** Load and verify Transaction Segment
** Load and verify Transaction Segment
** Incorporate 4 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 8BA6B22C-6BEC-4F31-9F8E-2DE15736B7FC
** Load and verify 1C2D8BDD-2097-420D-B07E-57237492C1B0
** Load and verify Freespace Summary
** Load and verify Block Accounting
   Unable to bootstrap transaction group 4117: inconsistent crosscheck
Invalidate transaction group? NO
   No valid commit checkpoint found
** The volume 9438339C-2B92-48CE-A671-112C7D7ED26C was found corrupt and needs to be repaired

Qui viene suggerito di disabilitare la crittografia, verificare, quindi riattivare nuovamente e qui suggerisce di utilizzare repairDisk (tuttavia non sono sicuro che sia il modo giusto poiché l'errore è un un po 'diverso e il comando dice che una partizione può essere cancellata mentre si ripara la mappa delle partizioni).

Sembra strano da quando ho appena cancellato la partizione ieri per riavviare la macchina del tempo da zero. Quale potrebbe essere il modo migliore di procedere?

EDIT: ho eseguito sudo diskutil repairDisk /dev/disk2 ma ottengo (sintetizzato):

The volume 9438339C-2B92-48CE-A671-112C7D7ED26C was found corrupt and needs to be repaired
Storage system check exit code is 1
Problems were encountered during repair of the partition map
Error: -69716: Storage system verify or repair failed
Underlying error: 1: Operation not permitted

9438339C-2B92-48CE-A671-112C7D7ED26C è in effetti la partizione di Time Machine.