Ok, the unit is abit new so I dont know if anyone will have done it yet.
The firmware for the 5045GDL+ and 5055GDL+ all look the same so it may be possible but previous versions have been limited to the size of the drive that originally came with the unit. If you fitted a bigger drive to a previous version it would only format to the old size.
Only thing I can suggest is if you really want to, try it but you may only end up with the same space available.
BTW, afaik the drive is formatted in FAT32 the same as previous Liteon's