This has happened so far on the ritek white printable 8X & the Verbatim white printable 12X Dvd-R. I use anydvd & clonedvd2. The disc will play perfect once or twice They are then placed in storage either a spindle or a dvd binder . After a month I will try and play it & I receive the invalid disk error. This happens on my home & pc dvd players. I assume bad disk. Are Verbatim & Ritek the same?