Date: Tue, 17 Aug 1999 21:50:30 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Amancio Hasty <hasty@rah.star-gate.com> Cc: current@FreeBSD.ORG Subject: Re: [re]writable cdrom drive Message-ID: <199908180450.VAA42534@apollo.backplane.com> References: <199908180433.VAA11141@rah.star-gate.com>
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:Is me again 8)
:
:mkisofs -R /mount/dir | cdrecord -v fs=6m speed=2 -dev=0:1:0
:
:Okay, whats the magic device name to access the yamaha cd recorder .
:I have tried several combinations of names with no success.
:
:dmesg says that I have:
:
:cd0 at ahc0 bus 0 target 1 lun 0
:cd0: <YAMAHA CRW6416S 1.0b> Removable CD-ROM SCSI-2 device
:cd0: 10.000MB/s transfers (10.000MHz, offset 15)
:cd0: Attempt to query device size failed: NOT READY, Medium not presen
:...
: Tnks!
: Amancio Hasty
: hasty@rah.star-gate.com
It found it, that's good.
Run this:
cdrecord -scanbus
The device is probably dev=0,1
Once you figure it all out you can set it up in /etc/default/cdrecord
so you never have to specify it on the command line again. See
'man cdrecord'
-
And to head off another question: When you are recording to a CD-RW
you can do a 'quick erase' of the media using 'cdrecord blank=fast'.
This does not actually erase the data, so if you have used say 100MB
you will only have 550MB left. You can actually erase the media using
'cdrecord blank=all', which takes a while.
CD-RW media lasts for around 1000 erasure cycles. CD-R media, obviously,
can only be written once.
-
Finally, when you pipe mkisofs to cdrecord directly it is possible to
fall behind enough that an error may occur. The CD writer needs a
continuous stream. There are two solution to this if it occurs: First,
write at a slower rate (speed=1 or speed=2 rather then the default 4),
or you need to mkisofs to an image file and then cdrecord from the image
file.
What I do is have a 650MB partition on one of my disks which I write my
backup files to. Since they are relatively large files there is little
chance of mkisofs getting behind so I then 'mkisofs -R' that directory
and pipe it to cdrecord to do the actual backup.
-Matt
Matthew Dillon
<dillon@backplane.com>
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