I have noticed that some optical drives (mainly Hitachi-LG ones) limit the reading speed until next ejection when encountering damaged parts of a disc, even **after** the damaged parts. ---- Both desktop and laptop disc drives by TSSTcorp (Toshiba and Samsung) limit the reading speed of VCD's and SVCD's to 16× constant angular velocity, even if laptop drives support 24× for other CD-R's and desktop drives usually 40×, 48× or 52× depending on CD type and model. ---- Some HL (LG) drives limit the reading speed of DVD-Video (including DVD-R Video and DVD+R Video) to ×12 (instead of ×16). TSST does not. Not yet tested with Pioneer and other brands. ---- DVD-RW and DVD+RW reading speed is limited to ×12 on pretty much all desktop drives, even if DVD-R, DVD+R and DVD-ROM speeds are usually up to ×16. ---- Also, no software for Linux/Windows for authoring DVD-VRO and DVD+VRO (format of DVD recorders) has ever been written, as far as I know.