Just found a problem with the firmware (or my drive problem?)
when I use 812 firmware, I can read OTP DVD and PTP DVD disc.
when I flash to 832 or 700, I can read PTP dvd, but can't OTP dvd disc.
anyone got this problem?
An abbreviation for Parallel Track Path, which is a technique for data organization on dual layer DVD discs. Using the Parallel Track Path (PTP), as opposed to OTP (Opposite Track Path), on a dual-layer DVD, both layers have a Lead-in and a Lead-out area as part of the information area. For each layer, the Lead-in area is located at the inner radius of the disc, and the Lead-out area is located at the outer radius of the disc. This layout structure is comparable with the layout of Compact Disc. Reading of the data is done, like CD, from the inner radius of the disc to the outer radius, for both information layers. The PTP method, for example, can be used for providing artist profiles and other background information in one track along with a movie in the other track, or quick-responding game structures achieved by means of quick access from layer to layer.
An abbreviation for Opposite Track Path, which is a technique for data organization on dual-layer DVD discs. With movies that have long playing times or very high picture quality, the storage capacity of one information layer on a DVD might not be sufficient so dual layer DVD's are used. In many cases, such as with long movies, the need for seamless continuation of the playback from one layer to the other is important. The method used for this is usually Opposite Track Path (OTP) method, as opposed to PTP (Parallel Track Path).
With OTP the first information layer starts with a Lead-in area at the inner radius of the disc and ends at the outer radius. The second information layer starts at the outer radius and ends with a Lead-out area at the inner radius of the disc. Reading of the data stored on the disc will start at the inner radius of the first information layer and proceeds until the Middle Area of this layer (found at the outer radius) is reached. Then a switch-over to the Middle Area (found at the outer radius) in the second information layer is made, in order to continue reading of the data from the outer radius up to Lead-out area at the inner radius of the second information layer.