Надеюсь я тебя правильно понял:
root@vusolo:~# df -h
Filesystem Size Used Available Use% Mounted on
ubi0:rootfs 100.5M 68.8M 31.7M 68% /
udev 2.0M 88.0K 1.9M 4% /dev
/dev/mtdblock2 4.0M 388.0K 3.6M 9% /boot
tmpfs 51.8M 260.0K 51.6M 0% /var
tmpfs 51.8M 64.0K 51.8M 0% /tmp
tmpfs 51.8M 0 51.8M 0% /dev/shm
/dev/sda1 74.5G 1.8G 72.7G 2% /media/hdd
root@vusolo:~# cat /etc/enigma2/settings | grep dat
config.misc.epgcache_filename=/media/hdd/epg_true.dat
root@vusolo:~#