@nixxda good to know. i almost mentioned the overhead for ntfs under linux, wasn't sure if it would be a problem with mining.
years ago i used ntfs-3g for large files on usb2 drives, had horrible write speeds and ended up adjusting some mount options. i don't remember which, and no longer use ntfs under linux.
found a faq but isn't very pratical for how to fix things
curious about details, such as your plot size, plot read time on ntfs vs ext4