What I'm doing wrong ?

Here's an example:
Code:
linux-m3s7:~ # zypper install emerald
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following NEW packages are going to be installed:
  compiz-emerald libwnck libwnck-1-22


Overall download size: 449.0 K. After the operation, additional 1.5 M will be used.
Continue? [YES/no]: y
Retrieving package libwnck-2.24.1-1.16.i586 (1/3), 80.0 K (269.0 K unpacked)
Failed to mount cd:///?devices=/dev/sr0 on /var/adm/mount/AP_0x00000001: No medium found (mount: No medium found on /dev/sr0)

Abort, retry, ignore? [A/r/i]: r
Failed to mount cd:///?devices=/dev/sr0 on /var/adm/mount/AP_0x00000001: No medium found (mount: No medium found on /dev/sr0)
UPDATE :: Apearantly, software sources contained my installation DVD - removed & everything works just fine.