Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!crdgw1!uakari.primate.wisc.edu!samsung!usc!elroy.jpl.nasa.gov!jato!vsnyder From: vsnyder@jato.jpl.nasa.gov (Van Snyder) Newsgroups: comp.sys.atari.st.tech Subject: Re: HD and DD floppies (Was: FTP problems) Message-ID: <1991Mar29.010400.22832@jato.jpl.nasa.gov> Date: 29 Mar 91 01:04:00 GMT References: <2631@prles2.prl.philips.nl> Reply-To: vsnyder@jato.Jpl.Nasa.Gov (Van Snyder) Organization: Jet Propulsion Laboratory, Pasadena, CA Lines: 19 In article mc4c+@andrew.cmu.edu (Mark Choi) writes: >> Excerpts from netnews.comp.sys.atari.st.tech: 25-Mar-91 HD and DD >> floppies (Was: FT.. John Janssen@hijg.prl.ph (1804) > >> 2. The material structure of the floppies is somewhat >> different. (Note: I'm not an expert in this latter area). > >Nope, on both counts. You are not an expert :^), and there is absolutely >no material difference between the two disks. This is a big lie from the >disk makers to charge way too much for DS/HD disks.... [stuff deleted] On 5.25 inch disks, DS/DD (360K) and DS/HD (1.2M) use different coercivity media, 300 Oersted media for DS/DD and 600 Oersted for DS/HD. If you put a DS/HD disk in a DS/DD drive, you might fry the heads. -- vsnyder@jato.Jpl.Nasa.Gov ames!elroy!jato!vsnyder vsnyder@jato.uucp