Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 (Tek) 9/28/84 based on 9/17/84; site tekecs.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore!decvax!tektronix!orca!tekecs!tekecs!tomb From: tomb@tekecs.UUCP Newsgroups: net.arch Subject: More on disk interfaces Message-ID: <5153@tekecs.UUCP> Date: Thu, 28-Feb-85 12:31:19 EST Article-I.D.: tekecs.5153 Posted: Thu Feb 28 12:31:19 1985 Date-Received: Mon, 4-Mar-85 06:12:40 EST Sender: tomb@tekecs.UUCP Organization: Tektronix, Wilsonville OR Lines: 24 SMD is widely referred to as a 10Mb/sec interface and that's a pretty good nominal figure but the "specified" data rate is 9.677 Mbits/sec +/- the rotational accuracy of the drive. ESDI as currently implemented (if you can really find anyone with a product :-) ) is also a 10Mbit/sec I/F. I hyave heard claims that ESDI can be stretched to 20 Mbits/sec but that's still future. In the meantime, the whole concept of System interfaces: Computer to controller Device interfaces: Controller to disk is becoming less meaningful as people are migrating VLSI implementations of system level interfaces directly into their drives and the old device interfaces no longer exist. Tom Beach email: ..!tektronix!tekecs!tomb -- Tom Beach email: ..tektronix!tekecs!tomb