Newsgroups: alt.cd-rom,comp.multimedia Path: cdrom.com!barrnet.net!agate!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!mcdata!meh0045 From: meh0045@mcdata.com (Mark Henrichs) Subject: Re: "Multi-session" means . . .? Message-ID: Followup-To: alt.cd-rom,comp.multimedia Organization: McDATA Corp, Broomfield, CO X-Newsreader: TIN [version 1.2 PL2] References: <2t571m$d8s@usc.edu> Date: Wed, 8 Jun 1994 23:44:59 GMT Lines: 23 Xref: cdrom.com alt.cd-rom:4758 comp.multimedia:4595 Tom Savola (savola@usc.edu) wrote: : Anyone have a quicky description/definition of what "multi-session" means for : CD-ROM drives? Does this have to do with how information is stored on CD-ROM : disks, or how the drive accesses information, or both? "Multi-session" refers to the Kodak Photo CD capability for recording more than one "session" of photos to the same Kodak Photo CD. For instance, if you bring your 24-exposure roll of film to Kodak for duplication on a photo CD, you get 24 photos on the CD. You could later bring in another roll of film and have a second session put on the CD. Most CD drives can read the first session, but your CD ROM drive must be capable of supporting multiple sessions ("multi-session") in order to read the "directory" to access the later sessions. The Kodak Photo CDs can hold up to 100 photos on a CD, *but* this must be on the first session. Each additional session eats up more CD space *just* for the additional directory space for the additional session(s), so multiple session CDs cannot hold as many photos (I don't know how much each directory "costs" in numbers of photos lost). This may not be a complete answer, but perhaps it helps. (I have no affiliation with Kodak. "Kodak" is a registered trademark)