CompuServe Messages

New features is somewhat vague. Basically it is a new track that isn't already defined by the CD audio and CD ROM standards. Moe 2 XA computer data, compress audio data and video/picture data. The computer data has more error correcting code. XA disc has compress audio/video or picture data is interleaved with normal computer data. NOTE: that the audio is not normal CD-Audio since it CD audio track can't be on the same track as XA. Single session is what every normal CD-ROM is currently. Basically it has one table of contents like a book would have. Multi-Session has many table of contents which can be compared to a having a notebook divided into section seperated by a plastic color sheet and this plastic color sheet can be thought of as a new table of contents. Since with a Photo CD you first add pictures (the very first time) in Spring 1992, In the FALL after you go to Comdex (Nov 16-20) you have more pictures to add which you do. This second sessions and all sessions added after that is multi-session. Normal CD-ROMs can only deal with one session since it is always at the beginning of the disk and be only be written at the time of creation. Photo CD allows the disk to be written to many times giving the different sessions each session with its own unique TOC (table of contents) This is very useful since many times there is still a large amount of space on CDs that could be used since most CDs don't use more than 1/2 the space on average. Hope this helps.