Liteon LH-20A1P not detecting some dvd rw media

My Liteon LH-20A1P drive has stopped recognizing some dvd rw media… these are the same disks that used to read fine before…
the media that i m having problem with is
Office Depot
http://www.officedepot.com/ddSKU.do?id=774072

i hav updated the firmware to KLOP, the latest version available
any suggestions will be greatly helpful…

Office Depot media is pure junk. For best results, use trusted name brands like Sony, Verbatim, Fujifilm, Maxell, etc.

superhero

I assume that they disc has reached the end of its life