Good. ROAD 2008=Romania has aprox 400 MB.
Garmin software read's all the maps?
Somewhere in the program you should see and have the possibility to check/uncheck the maps in your device.
And from what you say, you should have 3 maps.
CN Europe NT (City Navigator) = gmapprom.img in memory
Ro.A.D.2008 = gmapsupp.img in memory
O.F.R.M. Geotrade 5.21 LAT = gmapsupp.img on card

When you are in Romania and Bulgaria, if the map is not very detailed, I sugest you to uncheck City Navigator,
because the software will consider that map as primary and Road and OFRM will be ignored.
You'll see that when you will be there.

Have a good trip.