problem with /usr/libexec/ftpd download !

[Nikolay Kalev]

Recently i had several problems from this kind which i understand are 
something with ftpd no idea what yet !
When i do upload with /usr/libexec/ftpd image files of a DVD-R, the file 
seems to be ok, but downloading it via /usr/libexec/ftpd cuts them on 
360-400MB. I tought first that it has something to do with the SHED_ULE 
then i tryed with SHED_BSD no diference. I have tryed with PASV and 
normal mode same results. Downloading via sftp works just fine. Any 
ideas or sugestions ?