What means invalid block adress in Nero?

I recently had that error message and im not sure what it is first i thought it is the media (used cmc mag af1) but after a week i got the same error with a MCC 01 rg 20 ).
My Burner is a LiteOn SOHW832S
Ahtlon xp 1700
Windows XP Prof.
Ati Radeon 9600
Reader: LG 8162B
Writer: LiteOn SOHW832S (Retail bundled with nero —> updated it to the current version)
HD: Samsung 120GB