（Android系统目录结构）/mnt/sdcard 和 sdcard 的区别
mnt/是Unix/Linux系统下外部设备的专用目录,Linux默认挂载外部设备都会挂载到这个目录;如将SD卡挂载后,会生成目录:/mnt/sdcard/.
shell@aeon6735m_65c_s_l1:/mnt $ ls -al drwxr-xr-x root system 2016-01-01 08:00 asec dr-xr-xr-x root root 2012-03-12 15:30 cd-rom drwxr-xr-x system system 2016-01-01 08:00 media_rw drwxr-xr-x root system 2016-01-01 08:00 obb lrwxrwxrwx root root 2016-01-01 08:00 sdcard -> /storage/sdcard0 lrwxrwxrwx root root 2016-01-01 08:00 sdcard2 -> /storage/sdcard1 drwx------ root root 2016-01-01 08:00 secure drwx------ shell shell 2016-01-01 08:00 shell
/sdcard/是一个软链接(一个映射),相当于是Windows下的快捷方式,链接到/storage/sdcard0/.
shell@aeon6735m_65c_s_l1:/ $ ls -al drwxr-xr-x root root 2016-01-01 08:00 acct drwxrwx--- system cache 2016-01-01 09:34 cache lrwxrwxrwx root root 1970-01-01 08:00 charger -> /sbin/healthd dr-x------ root root 2016-01-01 08:00 config drwxr-xr-x root root 2016-01-01 08:00 custom lrwxrwxrwx root root 2016-01-01 08:00 d -> /sys/kernel/debug drwxrwx--x system system 2016-01-01 08:00 data -rw-r--r-- root root 381 1970-01-01 08:00 default.prop drwxr-xr-x root root 2016-01-01 08:00 dev -rw-r--r-- root root 127 1970-01-01 08:00 enableswap.sh lrwxrwxrwx root root 2016-01-01 08:00 etc -> /system/etc -rw-r--r-- root root 1851 1970-01-01 08:00 factory_init.project.rc -rw-r--r-- root root 18861 1970-01-01 08:00 factory_init.rc -rw-r--r-- root root 31264 1970-01-01 08:00 file_contexts -rw-r----- root root 1979 1970-01-01 08:00 fstab.mt6735 -rwxr-x--- root root 543928 1970-01-01 08:00 init -rwxr-x--- root root 605 1970-01-01 08:00 init.aee.rc -rwxr-x--- root root 1071 1970-01-01 08:00 init.environ.rc -rwxr-x--- root root 3548 1970-01-01 08:00 init.modem.rc -rwxr-x--- root root 43390 1970-01-01 08:00 init.mt6735.rc -rwxr-x--- root root 32013 1970-01-01 08:00 init.mt6735.usb.rc -rwxr-x--- root root 963 1970-01-01 08:00 init.no_ssd.rc -rwxr-x--- root root 4474 1970-01-01 08:00 init.project.rc -rwxr-x--- root root 23097 1970-01-01 08:00 init.rc -rwxr-x--- root root 2288 1970-01-01 08:00 init.trace.rc -rwxr-x--- root root 3885 1970-01-01 08:00 init.usb.rc -rwxr-x--- root root 583 1970-01-01 08:00 init.xlog.rc -rwxr-x--- root root 301 1970-01-01 08:00 init.zygote32.rc -rwxr-x--- root root 531 1970-01-01 08:00 init.zygote64_32.rc -rw-r--r-- root root 1062 1970-01-01 08:00 meta_init.modem.rc -rw-r--r-- root root 1630 1970-01-01 08:00 meta_init.project.rc -rw-r--r-- root root 14464 1970-01-01 08:00 meta_init.rc drwxrwxr-x root system 2016-01-01 08:00 mnt drwxrws--- root system 2016-01-01 09:34 nvdata drwxrwx--x system system 2016-01-01 08:00 persist dr-xr-xr-x root root 1970-01-01 08:00 proc -rw-r--r-- root root 9143 1970-01-01 08:00 property_contexts drwxrwx--- system system 2016-01-01 08:04 protect_f drwxrwx--- system system 2016-01-01 08:04 protect_s drwx------ root root 2016-06-23 22:25 root drwxr-x--- root root 1970-01-01 08:00 sbin lrwxrwxrwx root root 2016-01-01 08:00 sdcard -> /storage/sdcard0 -rw-r--r-- root root 471 1970-01-01 08:00 seapp_contexts -rw-r--r-- root root 84 1970-01-01 08:00 selinux_version -rw-r--r-- root root 253961 1970-01-01 08:00 sepolicy -rw-r--r-- root root 11419 1970-01-01 08:00 service_contexts drwxr-x--x root sdcard_r 2016-01-01 08:00 storage dr-xr-xr-x root root 2016-01-01 08:00 sys drwxr-xr-x root root 1970-01-01 08:00 system -rw-r--r-- root root 8695 1970-01-01 08:00 ueventd.rc lrwxrwxrwx root root 2016-01-01 08:00 vendor -> /system/vendor
