I:\is not accessible, Incorrect function - Help!

[mattiusb]

I have an Asus DRW0402 P/D drive. Consider the following:-

Fistly it worked fine. I then bought some 8 x speed DVD+R disks, (by accident!). It burned these but the drive was unable to read these. Now, However If I burn a 4 x speed DVD+R disc, (Vob files) then my Pioneer & Yamada stand alone DVD players will play it OK but my Asus burner will not recognise disc. It comes up with "I:\is not accessible, Incorrect function". However If I burn to a DVD+RW then I get no problems.
Does anyone have any ideas what is going on here??????????

[Baldrick]

PLEAse change the subject. Click on edit on your post. The subject should describe your topic...not just help! weird problem!!!! !! !!