Danke Peter,
der Hinweis mit den englischen Seiten war gut. Dort habe ich gefunden "There is no known limit on the number of folders. The maximum size of a folder is 4GB unless the file system limits the maximum file size to a lower value. Its not clear why 4GB was chosen as the limit, though that is the maximum file size in FAT32. "
Viele Grüße,
Sylke