//接入外置硬盘  可以在磁盘工具里看到有个灰色的外置硬盘名字(USB外置物理宗卷 ExFAT 1TB)，但是点装载 会弹窗：未能装载 d盘,com.apple.DiskManagement.disenter

wmac:~ wanger$ df
Filesystem    512-blocks      Used Available Capacity iused      ifree %iused  Mounted on
/dev/disk1s5   781250512  21431304 552168968     4%  484190 3905768370    0%   /
devfs                389       389         0   100%     682          0  100%   /dev
/dev/disk1s1   781250512 204062800 552168968    27% 1319719 3904932841    0%   /System/Volumes/Data
/dev/disk1s4   781250512   2097192 552168968     1%       1 3906252559    0%   /private/var/vm
map auto_home          0         0         0   100%       0          0  100%   /System/Volumes/Data/home
/dev/disk0s3   195239928 102288448  92951480    53%  303340   11671947    3%   /Volumes/BOOTCAMP

wmac:~ wanger$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         400.0 GB   disk0s2
   3:       Microsoft Basic Data BOOTCAMP                100.0 GB   disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +400.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD - 数据     104.5 GB   disk1s1
   2:                APFS Volume Preboot                 82.3 MB    disk1s2
   3:                APFS Volume Recovery                528.5 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4
   5:                APFS Volume Macintosh HD            11.0 GB    disk1s5

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *1.0 TB     disk2
   1:               Windows_NTFS 学习盘                  1.0 TB     disk2s1

wmac:~ wanger$ ls -lae@ /Volumes
total 0
drwxr-xr-x   4 root    wheel   128 12 30 12:37 .
drwxr-xr-x  22 root    admin   704 12 19 12:47 ..
drwxr-xr-x   1 wanger  staff  8192 12 30 03:36 BOOTCAMP
lrwxr-xr-x   1 root    wheel     1 12 30 04:53 Macintosh HD -> /

wmac:~ wanger$ mount
/dev/disk1s5 on / (apfs, local, read-only, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s1 on /System/Volumes/Data (apfs, local, journaled, nobrowse)
/dev/disk1s4 on /private/var/vm (apfs, local, journaled, nobrowse)
map auto_home on /System/Volumes/Data/home (autofs, automounted, nobrowse)



//未接外置硬盘
wmac:~ wanger$ df
Filesystem    512-blocks      Used Available Capacity iused      ifree %iused  Mounted on
/dev/disk1s5   781250512  21431304 552190032     4%  484190 3905768370    0%   /
devfs                386       386         0   100%     677          0  100%   /dev
/dev/disk1s1   781250512 204041736 552190032    27% 1319659 3904932901    0%   /System/Volumes/Data
/dev/disk1s4   781250512   2097192 552190032     1%       1 3906252559    0%   /private/var/vm
map auto_home          0         0         0   100%       0          0  100%   /System/Volumes/Data/home
/dev/disk0s3   195239928 102288448  92951480    53%  303340   11671947    3%   /Volumes/BOOTCAMP


wmac:~ wanger$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         400.0 GB   disk0s2
   3:       Microsoft Basic Data BOOTCAMP                100.0 GB   disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +400.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD - 数据     104.5 GB   disk1s1
   2:                APFS Volume Preboot                 82.3 MB    disk1s2
   3:                APFS Volume Recovery                528.5 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4
   5:                APFS Volume Macintosh HD            11.0 GB    disk1s5


wmac:~ wanger$ ls -lae@ /Volumes
total 0
drwxr-xr-x   4 root    wheel   128 12 30 12:09 .
drwxr-xr-x  22 root    admin   704 12 19 12:47 ..
drwxr-xr-x   1 wanger  staff  8192 12 30 03:36 BOOTCAMP
lrwxr-xr-x   1 root    wheel     1 12 30 04:53 Macintosh HD -> /


wmac:~ wanger$ mount
/dev/disk1s5 on / (apfs, local, read-only, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s1 on /System/Volumes/Data (apfs, local, journaled, nobrowse)
/dev/disk1s4 on /private/var/vm (apfs, local, journaled, nobrowse)
map auto_home on /System/Volumes/Data/home (autofs, automounted, nobrowse)
/dev/disk0s3 on /Volumes/BOOTCAMP (ntfs, local, read-only, noowners)