"Michael H. Warfield" wrote: > Typically, for "rotating magnetic" (hard drives, floppies, etc) > and others with concentric tracks, track zero starts on the outside and > increasing tracks progress toward the center. These are also your > "constant angular velocity" drives and the outer tracks have the highest > head to media velocity and, consequently, the best signal to noise > ratio. > > CD Roms and DVDs are actually "constant linear velocity" drives > and utilize a single spiral track which starts at the hub and progresses > outward. That's why you can have "mini" CDs and "Business Card" CDs, > because the drive, in this case, starts and the hub, which is at the same > location for all of them, and spirals outward. My understanding is that the original Mac 3.5" floppy drive (and later, the Apple II SuperDrive) were all variable-speed; out of curousity.... how was it with them, and how did the variable speed affect the layout of the tracks? I couldn't say if they were "constant linear velocity" but one suspects they must have been... Also, how is it the miniCDs are not round? ----------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com
This archive was generated by hypermail 2b30 : Wed Jul 11 2001 - 12:53:33 PDT