I have the same problem. the camera can not save to extsdcard, can not copy / paste, can not delete file, can not create folders. extsdcard can only be read alone. I use the microSD 64GB class10 Kingstone. s4 permissions problem on the device can only be read alone. untu systems and devices and I extsdcard fox with r / w on condition diroot phones. but permasalahnya permission r / w can not be permanent, and how many seconds will return to r / o. using total comander or shell emulator.
u0_a203@ja3g:/ $ su
root@ja3g:/ # mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,seclabel,relatime,mode=600 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,seclabel,relatime 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
/sys/kernel/debug /sys/kernel/debug debugfs rw,relatime 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
tmpfs /mnt/secure tmpfs rw,seclabel,relatime,mode=700 0 0
tmpfs /mnt/asec tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
/dev/block/mmcblk0p20 /system ext4 ro,seclabel,relatime,errors=panic,data=ordered 0 0
/dev/block/mmcblk0p3 /efs ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_alloc,errors=panic,data=ordered 0 0
/dev/block/mmcblk0p19 /cache ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_alloc,errors=panic,data=ordered 0 0
/dev/block/mmcblk0p21 /data ext4 rw,seclabel,nosuid,nodev,noatime,discard,journal_checksum,journal_async_commit,noauto_da_alloc,data=ordered 0 0
/dev/block/platform/dw_mmc.0/by-name/PERSDATA /persdata/absolute ext4 rw,seclabel,nosuid,nodev,relatime,data=ordered 0 0/data/media /mnt/shell/emulated sdcardfs rw,nosuid,nodev,relatime,uid=1023,gid=1023 0 0
/data/container /mnt/shell/container sdcardfs rw,nosuid,nodev,relatime,uid=1000,gid=1000 0 0
tmpfs /storage/emulated tmpfs rw,seclabel,nosuid,nodev,relatime,mode=050,gid=1028 0 0
/dev/block/vold/179:9 /storage/extSdCard vfat rw,dirsync,nosuid,nodev,noexec,noatime,nodiratime,uid=1000,gid=1023,fmask=0002,dmask=0002,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /storage/extSdCard/.android_secure tmpfs ro,seclabel,relatime,size=0k,mode=000 0 0
/data/media /storage/emulated/0 sdcardfs rw,nosuid,nodev,relatime,uid=1023,gid=1023 0 0
/data/media /storage/emulated/0/Android/obb sdcardfs rw,nosuid,nodev,relatime,uid=1023,gid=1023 0 0
/data/media /storage/emulated/legacy sdcardfs rw,nosuid,nodev,relatime,uid=1023,gid=1023 0 0
/data/media /storage/emulated/legacy/Android/obb sdcardfs rw,nosuid,nodev,relatime,uid=1023,gid=1023 0 0
root@ja3g:/ #