On Mon, Jul 09, 2001 at 03:10:59PM -0400, Dave Ausdenmoore wrote: > Not directly related to these lists, or forensics per se, but a curious > trivia type question from a class I'm assisting with a FLETC, and I don't > have the answer - > When data is written to a media, does the storage start at the outside of > the platter and work it's way in, or start at the innermost area of the > media and work it's way out? Is there a reference floppys and HDD's? SCSI > vs. IDE? Or is it based on manufactuer's perference? 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. CDs and DVDs are standardized. They would have to be the same. I know of no reason which would force a drive maker to map a magnetic drive track zero to the outer track, but it makes sense to start at your best signal position for your most critical tracks and work inward. I don't know of any exceptions to that, but anything is possible... :-) > TIA > aus > Dave Ausdenmoore | > 1000 Sycamore St. Rm 110 | "The future Masters of Technology > Cincinnati, Oh 45202 | will have to be > 513.946.6688(office) | lighthearted and intelligent. > 513.470.0986(cellular) | The Machine easily masters > 513.269.1336(pager) | the grim and the dumb." > daussieat_private (personal)| -- Marshall McLuhan, 1969 > aussieat_private (business) > ----------------------------------------------------------------- > > 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 Mike -- Michael H. Warfield | (770) 985-6132 | mhwat_private (The Mad Wizard) | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it! ----------------------------------------------------------------- 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
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