chiisana@Hayate:~/デスクトップ/ぷよぷよフィーバー$ sudo mount -o loop -t iso9660 ./discimage.iso /media/disc_image/
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

chiisana@Hayate:~/デスクトップ/ぷよぷよフィーバー$ ls -lha discimage.iso 
-rw-r--r-- 1 chiisana chiisana 753M 2005-08-31 02:07 discimage.iso