j'ai recommencé la deuxième ligne (avec les espaces) semble avoir fonctionné
voici ce qui apparait après la troisième ligne :
Last login: Thu Sep 3 20:39:14 on ttys000
iMac-de-Claude:~ claudeescot$ sudo diskutil umount /dev/disk2s2
disk2s2 was already unmounted
iMac-de-Claude:~ claudeescot$ sudo fsck_hfs-fy/dev/disk2s2
sudo: fsck_hfs-fy/dev/disk2s2: command not found
iMac-de-Claude:~ claudeescot$ sudo fsck_hfs _fy /dev/disk2s2
_fy: No such file or directory
Can't stat _fy
Can't stat _fy: No such file or directory
** /dev/rdisk2s2 (NO WRITE)
Executing fsck_hfs (version hfs-285).
** Checking Journaled HFS Plus volume.
fsck_hfs: Volume is journaled. No checking performed.
fsck_hfs: Use the -f option to force checking.
iMac-de-Claude:~ claudeescot$ sudo diskutil mount /dev/disk2s2
Volume on disk2s2 failed to mount
If the volume is damaged, try the "readOnly" option
iMac-de-Claude:~ claudeescot$
voici ce qui apparait après la troisième ligne :
Last login: Thu Sep 3 20:39:14 on ttys000
iMac-de-Claude:~ claudeescot$ sudo diskutil umount /dev/disk2s2
disk2s2 was already unmounted
iMac-de-Claude:~ claudeescot$ sudo fsck_hfs-fy/dev/disk2s2
sudo: fsck_hfs-fy/dev/disk2s2: command not found
iMac-de-Claude:~ claudeescot$ sudo fsck_hfs _fy /dev/disk2s2
_fy: No such file or directory
Can't stat _fy
Can't stat _fy: No such file or directory
** /dev/rdisk2s2 (NO WRITE)
Executing fsck_hfs (version hfs-285).
** Checking Journaled HFS Plus volume.
fsck_hfs: Volume is journaled. No checking performed.
fsck_hfs: Use the -f option to force checking.
iMac-de-Claude:~ claudeescot$ sudo diskutil mount /dev/disk2s2
Volume on disk2s2 failed to mount
If the volume is damaged, try the "readOnly" option
iMac-de-Claude:~ claudeescot$