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On Fri, Jul 22, 2005 at 06:13:46PM +0000, James wrote |
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> I need to learn how to use any simple cdrecording commands (syntax |
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> challeged user here) first. Then I can worry about all sorts of fancy |
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> file types/formats. I'd be better off downloading a know file to |
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> write to the device (ascii text?) or something on the gentoo system, |
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> just to build a little confidence. I need a newbie 'how to cd burn' |
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> before I worry about the intricacies of audio recording files on CDs. |
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> |
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> > 3) (Thanks for the idea, Dave Nebinger) Have you tried making an ISO |
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> > of all the audio files (unaltered) that you want to burn to CD, using |
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> > mkisofs, and then burning the ISO instead of the files? |
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> |
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> |
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> I'm going to read the cdrecord man pages. simple syntax examples |
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> or a link to a document to any cd burning software is what |
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> I need. |
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A quick rundown... |
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- audio CDs are generated by writing WAV files directly to CD. The |
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player reads them directly from the CD. You do not mount audio CDs. |
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- to get regular files onto CDs in a readable form, you first need to |
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create an ISO9660 filesystem image file, using mkisofs (man mkisofs). |
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Then burn the image file to a CD. You can usually get away with |
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piping output from mkisofs stdout to cdrecord stdin. |
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|
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- you need root privileges to properly use cdrecord; deal with it. If |
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you're scared of logging in as root, you can use sudoers.conf to give |
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a regular user permission to run specific command and parameters. I |
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need root-level access in order to read system files for my bi-weekly |
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backups, so cdrecord's need to be root was never an issue for me. |
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Note; The following is all done as root (or root equivalent). |
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The first thing you have to do is figure out your device numbers. |
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*YOUR SYSTEM CAN BE DIFFERENT FROM MINE*, so read the instructions |
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carefully. Execute the command "cdrecord dev=ATAPI: -scanbus". It can |
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take a few seconds to scan the system. Ignore the warnings/disclaimers |
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The important part is at the end. Here's that output for my system... |
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0,0,0 0) 'SONY ' 'CD-RW CRX195E1 ' 'ZYS5' Removable CD-ROM |
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0,1,0 1) 'SONY ' 'DVD-ROM DDU1621 ' 'S1.5' Removable CD-ROM |
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0,2,0 2) * |
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0,3,0 3) * |
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0,4,0 4) * |
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0,5,0 5) * |
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0,6,0 6) * |
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0,7,0 7) * |
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|
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This indicates that my CD-RW is device 0,0,0. mkisofs creates an |
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image of a specified directory, including subdirectories. Soft links do |
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*NOT* work. To save time, and avoid cluttering up my drive with temp |
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files, I pipe directly from mkisofs to cdrecord. I make a tar.bz2 of |
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the files I want backed up, and move the file to directory "xfer". The |
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following script does it all-in-one... |
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#!/bin/sh |
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mkisofs -R -J xfer | cdrecord speed=8 -tao -v fs=8m -data dev=ATAPI:0,0,0 - |
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The "-R -J" parameters should result in mkisofs output that's readable |
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by all linux and Windows machines. The cdrecord parameters are... |
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speed=8 ...the burner on this machine can go up to 48x. But my emergency |
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backup system is a 6-year-old Dell that can only read up to 12x. |
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Oops. This parameter slows down the burner so that the older |
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machine can read its output. |
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-tao "track at once". This allows you to do multi-session CDs. |
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-v I prefer some verbosity in the output. |
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fs=8m The fifo buffer size. The default is 4 megabytes, but I specify |
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8 megabytes to play safe against under-runs. |
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-data Straight out of the man page... |
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-data is the default, if no other flag is present and the file |
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does not appear to be of one of the well known audio file types. |
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If neither -data nor -audio have been specified, cdrecord |
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defaults to -audio for all filenames that end in .au or .wav and |
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to -data for all other files. |
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dev=ATAPI:0,0,0 This specifies the device. The 3 numbers can be found |
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by running "cdrecord dev=ATAPI: -scanbus" |
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- The hyphen at the end specifies to use stdin as the source file. |
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You will get a standard warning from cdrecord, because it can't |
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know ahead of time whether the piped input will fit onto the CD. |
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|
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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My musings on technology and security at http://tech_sec.blog.ca |
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-- |
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