2009/4/15 Bruce Cran <br...@cran.org.uk>: > On Wed, 15 Apr 2009 13:54:13 +0200 (CEST) > Alexander Best <alexbes...@math.uni-muenster.de> wrote: > >> hi there, >> >> i have 2 hard drives running. the first one is SATA300 and the other >> one UDMA100. here are the dmesg entries: >> >> ad0: 238474MB <SAMSUNG SP2504C VT100-50> at ata0-master SATA300 >> ad1: 157066MB <Hitachi HDS722516VLAT80 V34OA63A> at ata4-master >> UDMA100 >> >> i've tried to test the drives' performances using the following >> commands: >> >> dd if=/dev/ad0 of=/dev/null bs=1m count=300 >> and >> dd if=/dev/ad1 of=/dev/null bs=1m count=300 >> >> the results are: >> ad0 = 314572800 bytes transferred in 4.325645 secs (72722751 >> bytes/sec) ad1 = 314572800 bytes transferred in 5.166126 secs >> (60891430 bytes/sec) >> >> the results for ad0 are a bit disappointing though. is this normal or >> is bs=1m wrong? > > 70MB/s is a very good transfer rate for a hard drive. The 300MB/s rate > refers to the maximum the physical interface can support, but drives > never get close to that because they can't read from disk at that > speed. > > -- > Bruce Cran
Hehe, I think everyone makes that mistake when they're enthusiastic and sometimes even somewhat experienced. It's always such a disappointment when they realise, I remember when I did too. Chris -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"