I am having problems writing at *4 on both DVDs, I have tried 4 types of media including Bulk Pack. With both the latest versions of Nero and Roxio. They only give me the option of 2.4 speed write. At the moment I have them in USB 2 external cases but have tried fitting them into a High Spec PC. Have written loads of copies on the 1100 with no problems but the 1300 has just done it first illegal media with Bulk Pack Generation 4. but likes general Purpuse Bulk Pack.