Update
DM800SE flashed with OpenPLi-3.0-beta-dm800se-20130403
External HDD connected to USB port and mounted as /media/hdd with Device Manager plugin
In Device Manager, INFO menu, I set up "Never stand-by" the stand-by time and then restarted the decoder
Installed the plugin [enigma2-plugin-extensions-hddsleep_1.70_mipsel.ipk.tar.gz]
The HDD, finally, is listed in "Mounted devices" /dev/sdb1 on /media/hdd
but still DOES NOT GO in stand-by after the time I set up
When I open HDD sleep plugin, If I select the HDD and I press blue button [sleep sdb] NOTHING happens
This is part of fstab file
UUID=6c1edd9c-9faf-4762-8ef3-c69b1510362c /media/hdd auto
this is part of the telnet command "mount"
/dev/sdb1 on /media/hdd type ext4 (rw,relatime,barrier=1,data=ordered)