Date: Sun, 6 Jan 2008 19:30:03 GMT From: Marc Fonvieille <blackend@FreeBSD.org> To: freebsd-doc@FreeBSD.org Subject: Re: docs/119386: bsdlabel and newfs on DVD-RAM (handbook ch. 18.7.9) Message-ID: <200801061930.m06JU3OP078614@freefall.freebsd.org>
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The following reply was made to PR docs/119386; it has been noted by GNATS. From: Marc Fonvieille <blackend@FreeBSD.org> To: Martin Laabs <martin.laabs@mailbox.tu-dresden.de> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: docs/119386: bsdlabel and newfs on DVD-RAM (handbook ch. 18.7.9) Date: Sun, 6 Jan 2008 20:17:55 +0100 On Sun, Jan 06, 2008 at 03:36:45PM +0000, Martin Laabs wrote: > > >Description: > In chapter 18.7.9 of the handbook (Using a DVD-RAM) is a description how to use/prepare a DVD-RAM so that it can be used with freebsd. Therefore you have to use bsdlabel and newfs. > Since the blocksize of an DVD-RAM ist 2048 byte and bsdlabel and newfs (also with the -s 2048 option) do at least one write with blocksize smaller than 2048 byte both commands fails. > > >How-To-Repeat: > For example the first command, which is "dd if=/dev/zero of=/dev/acd0 count=2", produces the following output on my system (Optiarc DVD RW AD-7170A/1.02 device) > > su:~$ dd if=/dev/zero of=/dev/acd0 count=2 > dd: /dev/acd0: Invalid argument > 1+0 records in > 0+0 records out > 0 bytes transferred in 0.000138 secs (0 bytes/sec) > > If I add the bs=2k option it works fine: > > su:~$ dd if=/dev/zero of=/dev/acd0 count=1 bs=2k > 1+0 records in > 1+0 records out > 2048 bytes transferred in 0.001740 secs (1177026 bytes/sec) So: # dd if=/dev/zero of=/dev/acd0 bs=2k count=1 # bsdlabel -Bw acd0 # newfs /dev/acd0 is enough? (I can't test, I don't have any DVD-RAM writer under the hand) -- Marc
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