Je viens de taper la commande bless --folder /Volumes/"Macintosh HD"/System/Library/CoreServices.  Concernant le démarrage, je fais redémarrer ou non ? 
	
		
			
		
		
	
				
			j'ai le même problème, je viens de tout lire et je vais tenté de faire la manipulation sur le mien , SAUF la le hic, j'aimerais garder les données...
diskutil list-bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.1 GB     disk1
   1:                  Apple_HFS OS X Base System        2.0 GB     disk1s1
/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     disk2
/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk3
/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk4
/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk5
/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk6
/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk7
/dev/disk8 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk8
/dev/disk9 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk9
/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk10
/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk11
/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk12
/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk13
/dev/disk14 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk14
Offline
                                 Logical Volume Macintosh HD on disk0s2
                                 EBD0F2CD-0741-4031-97EA-8B4358EFC2DD
                                 Locked Encrypted
-bash-3.2#Offline
                                 Logical Volume Macintosh HD on disk0s2
                                 EBD0F2CD-0741-4031-97EA-8B4358EFC2DD
                                 Locked Encrypted-bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.1 GB     disk1
   1:                  Apple_HFS OS X Base System        2.0 GB     disk1s1
/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     disk2
/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk3
/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk4
/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk5
/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk6
/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk7
/dev/disk8 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk8
/dev/disk9 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk9
/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk10
/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk11
/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk12
/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk13
/dev/disk14 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk14
/dev/disk15 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +999.0 GB   disk15
                                 Logical Volume on disk0s2
                                 EBD0F2CD-0741-4031-97EA-8B4358EFC2DD
                                 Unlocked Encrypted
-bash-3.2#diskutil info /Volumes/"Macintosh HD"
ls /Volumes/"Macintosh HD"
bless --info /Volumes/"Macintosh HD"bash-3.2# diskutil info /Volumes/"Macintosh HD"
   Device Identifier:        disk15
   Device Node:              /dev/disk15
   Whole:                    Yes
   Part of Whole:            disk15
   Device / Media Name:      APPLE HDD ST1000LM024
   Volume Name:              Macintosh HD
   Mounted:                  Yes
   Mount Point:              /Volumes/Macintosh HD
   File System Personality:  Journaled HFS+
   Type (Bundle):            hfs
   Name (User Visible):      Mac OS Extended (Journaled)
   Journal:                  Journal size 81920 KB at offset 0x1b218000
   Owners:                   Enabled
   Content (IOContent):      Apple_HFS
   OS Can Be Installed:      Yes
   Recovery Disk:            disk0s3
   Media Type:               Generic
   Protocol:                 SATA
   SMART Status:             Not Supported
   Volume UUID:              9B1F875E-708D-3102-9EAC-0B4F67F12788
   Disk / Partition UUID:    EBD0F2CD-0741-4031-97EA-8B4358EFC2DD
   Total Size:               999.0 GB (998973898752 Bytes) (exactly 1951120896 512-Byte-Units)
   Volume Free Space:        145.1 GB (145057341440 Bytes) (exactly 283315120 512-Byte-Units)
   Device Block Size:        512 Bytes
   Allocation Block Size:    4096 Bytes
   Read-Only Media:          No
   Read-Only Volume:         No
   Device Location:          Internal
   Removable Media:          No
   Solid State:              No
   Virtual:                  Yes
   OS 9 Drivers:             No
   Low Level Format:         Not supported
   This disk is a Core Storage Logical Volume (LV).  Core Storage Information:
   LV UUID:                  EBD0F2CD-0741-4031-97EA-8B4358EFC2DD
   LVF UUID:                 852FC5AD-E41B-480F-B05F-7304655521FD
   LVG UUID:                 F0632447-B95F-43B6-9756-EECA6BF1C8AC
   Fusion Drive:             No
   Encrypted:                Yes
-bash-3.2# ls /Volumes/"Macintosh HD"
.DS_Store                Network
.DocumentRevisions-V100            System
.MobileBackups                Users
.OSInstallerMessages            Volumes
.PKInstallSandboxManager        bin
.Spotlight-V100                cores
.Trashes                dev
.dbfseventsd                etc
.file                    home
.fseventsd                installer.failurerequests
.hotfiles.btree                net
.rnd                    private
.vol                    sbin
Applications                tmp
Informations sur l???utilisateur    usr
Library                    var
-bash-3.2# bless --info /Volumes/"Macintosh HD"
finderinfo[0]: 22224616 => Blessed System Folder is /Volumes/Macintosh HD/System/Library/CoreServices
finderinfo[1]: 22649523 => Blessed System File is /Volumes/Macintosh HD/System/Library/CoreServices/boot.efi
finderinfo[2]:      0 => Open-folder linked list empty
finderinfo[3]:      0 => No alternate OS blessed file/folder
finderinfo[4]:      0 => Unused field unset
finderinfo[5]: 22224616 => OS X blessed folder is /Volumes/Macintosh HD/System/Library/CoreServices
64-bit VSDB volume id:  0x18284E7CBF7469AA 
	