I did everything again,, and deleted ONLY the e:\backup folder.
When booting i still get "Not all required resources can be loaded, This is usually caused by lack of HD space on E:\ or X:\. You can try FTPing (192.168.0.100:21) and correct the problem"
Well, when FTP:ing I have only 4 folders in C:\,
Audio, fonts, xboxdashdata.185ead00, xodash and 3 files: Xbox Book.xtf, Xbox.xtf, xboxdash.xbe.
In E:\ the FTP client shows these folders: app, dash, ndts, NKP11.
Well, the interesting thing is that if I hotswap and look in C:\ with xbrowser, then I have exactly the files you told me should be there, the 7 folders and 2 files.
I really dont understand this..