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?
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.