dd: failed to open ‘/dev/sdd1’: Permission denied
ubuntu@ubuntu:~$ mount
aufs on / type aufs (rw)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
/dev/sda on /cdrom type iso9660 (ro,noatime)
/dev/loop0 on /rofs type squashfs (ro,noatime)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
gvfsd-fuse on /run/user/999/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=ubuntu)
/dev/sdc1 on /media/ubuntu/SAMSUNG type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)
/dev/sdc5 on /media/ubuntu/7A97273A09D09CD2 type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)
/dev/sdb2 on /media/ubuntu/ACER type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096)
/dev/sdd1 on /media/ubuntu/UUI type vfat (rw,nosuid,nodev,uid=999,gid=999,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks2)
ubuntu@ubuntu:~$