apt-cdrom 添加本地源出错？？

crocodile320

hel 4 update 4 x64
将自己制作的rehl4的iso(dvd)mount到/mnt/cdrom

执行:apt-cdrom -m -d /mnt/cdrom add
出错

1. 
   
2. [richard@localhost ~]$ sudo apt-cdrom -m -d /media/cdrom/ add
   
3. Using CD-ROM mount point /media/cdrom/
   
4. Identifying.. [e8cf9443b8bc39910a4d12091525bdc0-2]
   
5. Scanning Disc for index files..  Found 0 package indexes and 0 source indexes.
   
6. E: Unable to locate any package files, perhaps this is not an APT enabled disc
   
7. [richard@localhost ~]$ ls /media/cdrom/
   
8. Display all 112 possibilities? (y or n)
   

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