Date: Fri, 18 Jan 2002 13:37:38 -0600 From: Krzysztof Parzyszek <kparz@iastate.edu> To: freebsd-questions@FreeBSD.ORG Subject: Re: DD image of a CDROM Message-ID: <20020118133738.A3503@warsaw.scl.ameslab.gov> In-Reply-To: <20020118133842.A34184@tharmas.rintrah.org>; from devin-freebsdquestions@rintrah.org on Fri, Jan 18, 2002 at 01:38:42PM -0500 References: <20020118090529.A57267@sunder.touchtunes.com> <20020118133842.A34184@tharmas.rintrah.org>
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On Fri, Jan 18, 2002 at 01:38:42PM -0500, devin wrote:
>
> specify a blocksize of 2048, i.e. dd if=/dev/acd0c of=cdimage.iso bs=2048
Doesn't work for me:
# dd if=/dev/acd0c of=file.cd bs=2048
dd: /dev/acd0c: Invalid argument
0+0 records in
0+0 records out
0 bytes transferred in 0.000251 secs (0 bytes/sec)
Seems like read fails on /dev/acd0c:
# truss dd if=/dev/acd0c of=file.cd bs=2048
[...]
open("/dev/acd0c",0,00) = 3 (0x3)
fstat(3,0xbfbff6b8) = 0 (0x0)
ioctl(3,FIODTYPE,0xbfbff6b4) = 0 (0x0)
ioctl(3,DIOCWLABEL,0xbfbff6b0) ERR#9 'Bad file descriptor'
open("file.cd",1538,0666) = 4 (0x4)
fstat(4,0xbfbff6b8) = 0 (0x0)
lseek(4,0x0,1) = 0 (0x0)
break(0x8060000) = 0 (0x0)
gettimeofday(0xbfbff74c,0x0) = 0 (0x0)
sigaction(SIGINFO,0xbfbff730,0xbfbff718) = 0 (0x0)
sigaction(SIGINT,0xbfbff720,0xbfbff708) = 0 (0x0)
read(0x3,0x805f000,0x800) ERR#22 'Invalid argument'
[...]
--
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