L'HDD del mio Mac non si sta aprendo. Quando inserisco diskutil umountDisk dev/disk0
mostra:
At least one volume could not be unmounted
sais-MacBook-Pro:~ sk$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF 101.1 GB disk0s2
3: Apple_HFS Recovery HD 19.4 GB disk0s3
4: Apple_Boot Recovery HD 650.0 MB disk0s4