Weird. I connected ntfs usb 320gb disk drive and noticed that some folders (drawers?) are not visible in MOS, as if they don't exist.
When I connect the drive to x86 linux machine everything is OK.
Anyone experienced this? Should I reformat the disk to fat32? Or ext2?

Yes, reformat for Fat32. MorphOS have a problems with NTFS. You can read NTFS disk but You cant delete any files or save on this disk...