Some SONY DVD RW DW-U21A questions

Hi, I have a G5 Dual 2Ghz with a SONY DVD RW DW-U21A drive in it. I have some questions I have not been able to get answers to. Hoping to get some help here
1. Can it PLAY dual-layer data discs? My friend burned me a disc on his dual-layer drive. Can I safely insert that into this drive and access the files like any other disc?
2. Can I use 16x media to burn DVDs? I know I'd only be able to burn at a maximum of 8x, but I have heard conflicting reports of whether you can use 16x media at ALL in the drive. With 8x media drying up in the stores, this is important. People have said, why not try it? I'd rather have a definitive answer and not A) mess up my drive or B) waste money on discs I can't use.
3. I have a music CD that won't mount. The computer justs pits it out. there is nothing wrong with the CD. Plays fine everywhere else. I cleaned out the system cache and got it to mount ONCE in the G%, but now it is spitting it out again. Anyone heard of this issue?
Thanks for the help!

Same drive in this dual 2.5.
1. Yes. Shouldn't have any problems.
2. Yes. You won't mess up your drive.
3. I have no idea. Has the disc been cursed with some sort of copy protection?

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