Path: utzoo!censor!geac!lethe!tvcent!comspec!telly!attcan!uunet!ispd-newsserver!kodak!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!mc4c+ From: mc4c+@andrew.cmu.edu (Mark Choi) Newsgroups: comp.sys.atari.st.tech Subject: Re: HD and DD floppies (Was: FTP problems) Message-ID: Date: 26 Mar 91 22:22:28 GMT References: , <2631@prles2.prl.philips.nl> Organization: Carnegie Mellon, Pittsburgh, PA Lines: 21 In-Reply-To: <2631@prles2.prl.philips.nl> > 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. The only difference between the two, besides the extra hole, is that there are *sometimes* extra quality check on the DD and HD disks. Actually, even SS disks are the same. If they are given the hole, you can format SS disks to HD with no porblems. They (disk makers) just manufacture a batch of floppies, set aside a bunch to fill the SS order, and then test them for SS integrity. Then they fill their DD order, and test them, then they fill their HD order, and test them, all from the same batch. As the error rate in manufacture is fairly constant, the chances of a SS disk going bad are not that much more than off the shelf HD disks. This is why large fortune 500 corporations use devices like DiskDoubler to save money, and buy SS or DD disks. -geisha-