jalaneme- Ok....this is what you do. First BACKUP EEPROM!!! You can do this by FTPing it from your xbox to your PC. It should be in a folder named BACKUP on the C or E Drives (Easiest way to do this is Backup both the C and E drives to the PC....it's less than a gig of space). You need the backuped Drives ( or EEPROM.bin file) incase your HDD craps out. You use it and "XBOXHdMaker Ver.1.9" to make a new ( or larger HDD) Google "Upgrade Xbox Hdd" for more info....
The reason your HDD is got little space is because the stock HDD is only 8Gb....after mod about half is free'd up...the rest is cache, so dont try to format F Drive. Do that when you get Larger HDD.
Good job on getting XBMC installed!!!!! Go to the XBMC.org forums to learn more about, what has become the BEST dash for the Xbox......XBMC!!!
If you have an HDTV....I personally say check out "Aeon" skin for XBMC. I have a 42" HDTV and I switch up between a couple of different dash skins "MC360","Aeon" and "Xtv". Learn more on XBMC skins at Xbox-Scene. Or Google "Team Blackbolt".....their site is undergoing some changes but they have great info there and links to T3ch's site to D/L new compiles of XBMC (updated every 2 weeks), Links to the Blackbolt forums at Xbox-Scene are there too.
Just so you dont worry......I done my own work to my xbox 2 years ago....never owned an xbox before then. I now own 3 xbox's .....my first has a 300 Gb (W/D) HDD....XBMC (Default dash) with 180 movies, 30 complete TV Seasons,.... Hundreds of Mp3's,.... XMugen, MAMEoX, NES, SNES, Killer Instinct 1+2,.... Avalaunch, MXM, Evox, and UnleashX Dashs (used as Apps).
This Are screenshots of that one........
I made the theme in that Pic!!!!....Google "XBMC BlackMarket" for Skins+Themes for XBMC Dashboards. Anything with the "FourTwentySmiles" name is me. Hope you like them.
This should cover MOST Every question you are likely to have....but remeber "Google" is your friend.
AND......Try your best to keep your cool.....walk away, it will stay there....and dont "go on blast" in the forum....peeps are less likely to help you if you act like a douche. I'm new here, so I dont know how it's done here, but if you do it in Xbox-Scene Forum.....People will only blast you back and ask you if you know how to work a search engine.
larvi- If you want to make sure that the Xbox you are using as a Media Center doesn't connect to XBL do this......Go to the MS dash ( original xbox dash).....find the settings for XBL and erase any accounts on THAT Xbox. It will still connect to LAN without trying to connect to XBL. NO XBL Account.....NO Connect to XBL!
Hope this helps you out too!