I'm had this 52x for about 6 mo with Nero 5.5 now and every other mounth I'm coppying somthing where I have to use a special features of it like creating an iso or a udf cd... I don't know what the heck those things are so this is my question. 1. CD-rom (iso) 2. CD extra 3. Video CD 4. Super Video CD 5. CD-ROM Boot 6. CD-ROM Hybrid 7. CD-ROM (UDF/ISO) 8. CD-ROM (UDF) I know these are CD-ROM formsts but what I need or should I say, want to know, is what are they used for and in when would you use them, what purpose do they serve. I have other questions but I can't think of any now, so I let this be as it is now and when I get the answer to this question it'll intreig others.