No. You must rebuild (or create) the desktop file on any cartridge not
containing one from System 6 to bring it back into a System 6 environment.
If this disk is locked or does not contain enough space for a resource
desktop, System 6 won't mount the volume. You should unlock the volume to
let a resource desktop be created.
A System 7 hard disk with not enough space could have the same problem and
not mount under System 6.0. To work around this, remove some files under
System 7 to let a resource desktop be created.