If you have ELITE then do this
works with premium)
In dir /etc/ you have fstab file. Edit this line:
/dev/hdb1............ /media/hdd
to
/dev/sda1............. /media/hdd
Save file. Reboot.
Then
If you have data in the hdd that you dont want to delete do this:
By FTP create dir /movie in the dir /hdd ( it will be this /media/hdd/movie )
Now you can record.
If you dont have any data on usb then goto menu settings / harddisk / initialize disk.
This will format the USB HDD, mount it on /media/hdd and also creates the movie dir.