how to unlock a dvd in HMC

When I do HMC upgrade, I download HMC code from IBM web site and burn it to a DVD disk, when I get the first DVD out of HMC's dvd rom and input the second DVD, it shows error:

The requested device is already locked by the process: Install Corrective Service.

Would you like to try to request a lock of the device again?

How to unlock the dvd disk?

Hi,

why do you have more than one DVD - I don't recall the upgrades to be that big - do you try to perform more than one patch same time? If so this might cause your trouble since the hmc expects to be rebooted between these upgrades.

Kind regards
zxmaus

When I import VG, it shows:

0516-622 synclvodm: Warning, cannot write lv control block data.

I found AIX V4.3 have updatelv command can recovery LVB from VG, however, updatelv is not existed on AIX 5L, which command to replace it?