Is this normal?

irb(main):027:0> d = Dir.new '/'
=> #<Dir:0xb7dd5c54>
irb(main):028:0> d.entries
=> [".", "..", "lost+found", "etc", "media", "cdrom", "var", "usr",
"bin", "boot", "dev", "home", "lib", "mnt", "proc", "root", "sbin",
"tmp", "sys", "srv", "opt", "initrd", ".dev", "initrd.img", "vmlinuz",
"win", "ibm", "initrd.img.old", "vmlinuz.old"]
irb(main):029:0> d.entries
=> []
irb(main):030:0> RUBY_VERSION
=> "1.8.2"
irb(main):031:0> RUBY_RELEASE_DATE
=> "2004-12-25"