First, you 'll need a modchip As for the limit, that is the limit for the F partition on the drive, my xbox has a 320 gig hard, with the G partition being everything afterwards. Now, as to swapping the HD, if you've ever put a HD in a computer, you can do it. You'll need a torx 20 screwdriver. Taken from: http://forums.afterdawn.com/thread_view.cfm/37430 *--Harddrive replacements--* -not responsible for any damages done-- The stock MS harddrive varies from around 8GB to 10GB, depending on the number on the harddrive. Most XBOX games average around 1 to 2GBs in size, so the stock drive allows you to save only about 4 - 6 games. lets change that! -Overview/Requirements- You need to have a mod chip installed onto your xbox, flashed with a bios that alllows for a HD swap (evolution X and EvoX bioses do, not sure about others, i personally use EvoX D6 Eject Fix Bios) 1. In the evolution X dashboard, go to system utils > Backup. this will back up important info into the C:Backup folder on your xbox (make sure that it does backup, some earlier versions of evolution x dashboard didn't backup the files right, evolution x dashboard v 1.8.3285 works beautifully, there should be five files in there) 2. Backup both your C and E drives of the xbox harddrive (you'll want this to copy back onto the new harddrive and to have just in case) 3. Make a new folder for the evolution x dashboard hd install cd we need to make. You can use the evox.ini file from the xbox (the one we backed up earlier). You'll need to change a few things in it: -leave everything else above this part alone, but go down to the [MENU] part. Replace what is there with this: [Menu] Section "Install Menu" { Item "Install New Drive",@210 Item "Settings",@9 Item "Reboot",@5 } [Action_10] Info "Install HDD" Warning "This will format all drives" Warning "Make sure you have a backup of C & E" Progress "Formatting Drives" ConfigSector "backupdisk.bin" Format c: Format e: Format f: Format x: format y: format z: [Action_11] [Action_12] -then save it to the new folder, also copy over your evolution x dashboard file and rename it to default.xbe and also copy the folder "Backup" from the C:Backup of the xbox. so you have these files in the new folder: evox.ini default.xbe backupbios.bin backupdisk.bin backupeeprom.bin backuphddinfo.txt backuphddkey.bin and then make an xbox image file (i use xISO) and burn it to a blank cd-rw (one that you know works in your xbox). 4. Disassemble your xbox and replace the Harddrive (make sure the jumpers on the harddrive are set to Primary or Master. I am not sure about what harddrives work or not.. but i would assume any IDE ata/100 5400RPM or better, the max size you can replace is about 130GB, i guess the xbox doesn't recognize anything above that or something... Now hook up the harddrive like any harddrive and reassemble your xbox. (keep your old xbox harddrive, just in case something goes awry) 5. Boot up your xbox with the cd we just created in step 3. It will load the evoluation x dashboard, go the the Install HD and follow the steps and wait for it to finish. 6. then just reinstall your c and e drives and make sure your evox.ini file or settings has USE F Drive? to a Y for YES. Your F Drive on the new hd will be the biggest and where you'll want to save games, music or apps.. -------------------------- I modified the intructions (i can't remember, but i found out how on Xbox-scene) in order to format the G drive as well. I did not lock my HD as I had no intention of playing live. You'll need to lock the HD if you plan on playing live (you can use EVOX to do so)

I put a 250GB harddrive in my Xbox. I can now copy games to the harddrive and also delete them. I presently have 92 games on my Xbox and can play them without the discs. It is the best investment I've ever made, now I have the ultimate Xbox machine, and it is the green Halo edition Xbox. I plan to upgrade soon to a 300GB-320GB.

You will need to have an XBox replacement Bios that can address past the 137gb limit - Evox M8 Plus bios is a good choice. You can then use a tool called EVTool to customize this bios so that the drive partitioning works the way you want it.