Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!apple!agate!agate!phr From: phr@lightning.Berkeley.EDU (Paul Rubin) Newsgroups: comp.sys.ibm.pc.hardware,connect.audit Subject: Re: Conner 200M IDE drive Message-ID: Date: 3 Apr 91 10:37:01 GMT References: <1991Mar31.162532.9509@ibmpcug.co.uk> <1991Apr3.035310.11481@jwt.UUCP> Sender: usenet@agate.berkeley.edu (USENET Administrator) Organization: ucb Lines: 29 In-Reply-To: john@jwt.UUCP's message of 3 Apr 91 03:53:10 GMT In article <1991Apr3.035310.11481@jwt.UUCP> john@jwt.UUCP (John Temples) writes: Path: agate!bionet!uwm.edu!zaphod.mps.ohio-state.edu!samsung!uunet!jwt!john From: john@jwt.UUCP (John Temples) Newsgroups: comp.sys.ibm.pc.hardware,connect.audit Date: 3 Apr 91 03:53:10 GMT References: <1991Mar31.162532.9509@ibmpcug.co.uk> Organization: Private System -- Orlando, FL Lines: 25 In article <1991Mar31.162532.9509@ibmpcug.co.uk> hdrw@ibmpcug.co.uk (Howard Winter) writes: >2. What is the achievable data-transfer rate ? I've used the CP3204 under both DOS and UNIX, and the transfer rate was pathetic. I/O benchmarks (ones that do more than just read the same 64K over and over) showed between 80 and 150 KB/sec read and write rates. Even worse than 1:1 ST-506/MFM. I suspect the controller on the drive isn't fast enough to run at 1:1 interleave, but I don't have the appropriate software to reformat it and find out. ... Maybe your cpu isn't fast enough. I get 645k/sec from my CP3204 (1:1 interleave) on a 25MHz cacheless 386dx (Norton sysinfo benchmark). It seems pretty fast in practice, too, subjectively, but I don't have any other measurements. A friend of mine has measured 1.1MB/sec from a similar (non-Conner) 200MB drive on a 486-33 system. The PC-AT bus is 16 bits wide and runs at 8 MHz (even for faster cpus), so 2 MB/sec is the upper bound on the transfer speed for any 16-bit controller. I am very happy with my IDE CP3204.