Not enough memory in the filegroup PRIMARY + Cannot delete corrupted raster

I am trying to add data to a raster in an sde-File Geodatabase during which I received an error message complaining that the MSSQL Server sde database ran out of memory. Now my problem is that because the process was not successful, the raster file is now corrupt and cannot be opened or deleted by ArcCatalog. So I can´t delete the corrupt file.

Why does the sde database get so big? Do all my data get copied into the sde database when I register a geodatabase with ArcSDE? The File Geodatabase in question in on my harddrive.

Windows 7 64bit / ArcSDE 9.3 / ArcGIS 10.0

Thanks,

Robert