dm800se a8p - dream elite image - hdd problem

hi guys….
I installed an HDD inside the box…. but it won't mount.
the same HDD using the external usb, it mount , initialize and available for recording….
any idea why is not recognized when installed inside?
tks

tks…. but this is how my /fsatb looks like: (the hdd is physically installed)

#automatically edited by enigma2, Thu, 01 Jan 1970 01:04:43
/dev/root / rootfs noatime 0 1
none /proc proc nodev,noexec,nosuid 0 0
none /proc/bus/usb usbfs nodev,noexec,nosuid 0 0
none /sys sysfs nodev,noexec,nosuid 0 0
none /dev/pts devpts noexec,nosuid,mode=0620,gid=5 0 0
none /dev/shm tmpfs nosuid,nodev 0 0
none /var/volatile tmpfs mode=0755 0 0
/dev/mtdblock2 /boot jffs2 ro 0 0

I HAVE NO LINE: #/dev/sda1 /media/hdd auto defaults 0 0

ANY IDEA?

#automatically edited by enigma2, Thu, 01 Jan 1970 01:04:43
/dev/root / rootfs noatime 0 1
none /proc proc nodev,noexec,nosuid 0 0
none /proc/bus/usb usbfs nodev,noexec,nosuid 0 0
none /sys sysfs nodev,noexec,nosuid 0 0
none /dev/pts devpts noexec,nosuid,mode=0620,gid=5 0 0
none /dev/shm tmpfs nosuid,nodev 0 0
none /var/volatile tmpfs mode=0755 0 0
/dev/mtdblock2 /boot jffs2 ro 0 0
/dev/sda1 /media/hdd auto defaults 0 0

STILL NOTHING….
IF I USE THE EXTERNAL USB PORT… IT MOUNT.. SO THE FORMATTING IS OK, THE DISK IS OK

please help