Last login: Thu Nov 30 14:57:41 on console hs-mac:~ hs$ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *128.0 GB disk0 1: Windows_NTFS 128.0 GB disk0s1 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *80.0 GB disk1 1: EFI 209.7 MB disk1s1 2: Apple_HFS Snow Leopard 79.7 GB disk1s2 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *40.0 GB disk2 1: EFI 209.7 MB disk2s1 2: Apple_HFS Install OS X El Capitan 39.7 GB disk2s2 hs-mac:~ hs$ diskutil mount disk2s1 Volume on disk2s1 failed to mount hs-mac:~ hs$