Date: Sun, 6 Aug 2000 12:27:56 +0930 From: Greg Lehey <grog@lemis.com> To: Francesco Casadei <fcasadei@inwind.it> Cc: freebsd-questions mailing list <freebsd-questions@FreeBSD.ORG> Subject: Re: LS120 drive has a strange behaviour with 1.44MB floppy Message-ID: <20000806122756.C69570@wantadilla.lemis.com> In-Reply-To: <20000805184339.A426@casimirhost.kasby>; from fcasadei@inwind.it on Sat, Aug 05, 2000 at 06:43:39PM %2B0200 References: <20000805184339.A426@casimirhost.kasby>
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On Saturday, 5 August 2000 at 18:43:39 +0200, Francesco Casadei wrote: > I've already posted a question about using 1.44MB floppy with an > LS120 drive. Thanks to Filippo Moretti for the quick answer, as you > suggested I've read tutorials at freebsd.org, but I couldn't find > anything. I've found a couple of questions like mine in the mailing > lists, but no answers! So the question is still valid... > > I have another question about LS120 (the last I hope). > > root> dd if=/cdrom/freebsd/floppies/kern.flp of=/dev/rafd0 > 2880+0 records in > 2880+0 records out > 1474560 bytes transferred in 735.956097 secs (2004 bytes/sec) > > 736 seconds => 12 min 16 sec. Does it seem reasonable? Maybe :-) > The transfer rate is also very slow when I copy files to a 1.44 > floppy with an MSDOS filesystem. The hardware should be ok because > it does work under win2k. Try this: dd if=/cdrom/freebsd/floppies/kern.flp of=/dev/rafd0 bs=36b I would expect the transfer rate to increase to about 30 kB/s and the time to be about 50 seconds. Is that correct? The background here is that the first form writes one sector at a time. For whatever reason, by the time you issue the next write command, the write head has already passed the sector, and you have to wait a complete revolution. That should make six sectors a second, or about 3 kB/s. I'm not sure why it's even slower than that, but possibly retries or head change problems could influence it. Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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