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[Movax]

Use an auto-installer disk to obtain FTP access (HeXen, AID, Slayers) and try to fix things.
Or hold down white + Y during boot, you may be able to get FTP access.

If you can't do FTP you may be able to use the file manager from the previously mentioned auto-installer disks to fix things. Sounds like you updated a really old incompatible XBMC by writing files overtop. Try renaming the old folder and making a new folder with only the new files.

I am assuming XBMC is your dashboard..?

[Movax]

Quick google search says you should use boXplorer  on Slayers.

[Movax]

Not sure what is wrong, you should try deleting the folder UDATA..? Your hard drive may be failing/ need to be reformatted. If you are going to d/led a new installer, you should grab HeXen, it is the most flexable.

[1hotjob]

As you learned, the Xbox needs file systems in the right place. The Xbox will create uData and Tdata folders if they don't exist. They need to stay on the E drive though.

It is a good idea to upgrade to the latest softmod software. Especially with the large drive you have in there. Did you format it with the latest xbpartitioner? If not you may start to lose data when you start filling it up.

[Heimdall]

Check the cluster size - see the link in my signature for details. You've almost certainly got the wrong cluster size on the extended partition.

[themacmeister]

The man is right!

Even with NDure + XBHDM, I still couldn't use anything near what I knew I had (300GB)

I then discovered XBPartioner, and set a 32K cluster size, all good now.

You may need to install an F and a G partition with a drive that size?!

best of luck!