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Clarified drives and their addresses

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This commit is contained in:
Thomas Schmitt 2006-12-15 10:15:50 +00:00
parent ae8875c215
commit 4446eadcf4
1 changed files with 52 additions and 26 deletions
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libburn/trunk/cdrskin/cdrskin.1
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@ -27,8 +27,9 @@ cdrskin \- burns preformatted data to CD-R or CD-RW via libburn.
.\" \fI<whatever>\fP escape sequences to invode bold face and italics, .\" \fI<whatever>\fP escape sequences to invode bold face and italics,
.\" respectively. .\" respectively.
.PP .PP
\fBcdrskin\fP is a program that provides some of cdrecord's options in a compatible way. \fBcdrskin\fP is a program that provides some of cdrecord's options
You don't need to be root to use it. in a compatible way.
You do not need to be superuser for its daily usage.
.PP .PP
.B Overview of features: .B Overview of features:
.br .br
@ -46,21 +47,17 @@ Bus scan, burnfree, speed options, retrieving media info, padding, fifo.
.br .br
See section EXAMPLES at the end of this text. See section EXAMPLES at the end of this text.
.PP .PP
.B Known deficiencies:
.br
No DVD support yet.
.PP
.B Track recording model: .B Track recording model:
.br .br
The input-output entities which get processed are called tracks. The input-output entities which get processed are called tracks.
A track stores a stream of bytes. A \fBtrack\fP stores a stream of bytes.
.br .br
Each track is initiated by one track source address argument, which may either Each track is initiated by one track source address argument, which may either
be "-" for standard input or the address of a readable file. If no write mode be "-" for standard input or the address of a readable file. If no write mode
is given explicitely then one will be chosen which matches the peculiarities is given explicitely then one will be chosen which matches the peculiarities
of track source and the state of the output media. of track source and the state of the output media.
.PP .PP
There can be more than one track burned by a single run of cdrskin. More than one track can be burned by a single run of cdrskin.
CDs can be kept appendable so that further tracks can CDs can be kept appendable so that further tracks can
be written to them in subsequent runs of cdrskin (see option -multi). be written to them in subsequent runs of cdrskin (see option -multi).
Info about the addresses of burned tracks is kept in a table of Info about the addresses of burned tracks is kept in a table of
@ -71,15 +68,15 @@ In general there are two types of tracks: data and audio. They differ in
sector size, throughput and readability via the systems' CD-ROM drivers sector size, throughput and readability via the systems' CD-ROM drivers
resp. by music CD players. resp. by music CD players.
.br .br
If not explicitely option -audio is given, then any track is burned as data If not explicitely option -audio is given, then any track is burned as type
unless the track source is a file with suffix ".wav" or ".au" and has a data, unless the track source is a file with suffix ".wav" or ".au" and has a
header part which identifies it as MS-WAVE resp. SUN Audio with suitable header part which identifies it as MS-WAVE resp. SUN Audio with suitable
parameters. Such files are burned as audio tracks by default. parameters. Such files are burned as audio tracks by default.
.PP .PP
While audio tracks just contain a given time span of acoustic vibrations, While audio tracks just contain a given time span of acoustic vibrations,
data tracks may have an arbitray meaning. Nevertheless, ISO-9660 filesystems data tracks may have an arbitray meaning. Nevertheless, ISO-9660 filesystems
are established as a format which can represent a tree of directories and are established as a format which can represent a tree of directories and
data files on all major operating systems. Such filesystem images can be files on all major operating systems. Such filesystem images can be
produced by programs mkisofs or genisoimage. They can also be extended by produced by programs mkisofs or genisoimage. They can also be extended by
follow-up tracks if prepared properly. See the man pages of said programs. follow-up tracks if prepared properly. See the man pages of said programs.
cdrskin is able to fulfill the needs about their option -C. cdrskin is able to fulfill the needs about their option -C.
@ -99,6 +96,37 @@ CD-RW media can be blanked to make them re-usable for another
round of overwriting. Blanking damages the previous content but does not round of overwriting. Blanking damages the previous content but does not
make it completely unreadable. It is no effective privacy precaution. make it completely unreadable. It is no effective privacy precaution.
Multiple cycles of blanking and overwriting with random numbers might be. Multiple cycles of blanking and overwriting with random numbers might be.
.PP
.B Drive preparation and addressing:
.br
The drives, either CD burners or DVD burners, are accessed via addresses which
are specific to libburn and the operating system. Those addresses get listed
by a run of \fBcdrskin --devices\fP.
.br
On Linux, they are device files which traditionally do not offer
w-permissions for normal users. Because libburn needs rw-permission,
it might be only the superuser who is able to get this list without further
precautions.
.br
It is consensus that \fBchmod a+rw /dev/sg0\fP or \fBchmod a+rw /dev/hdc\fP
is less security sensitive than chmod u+s /usr/bin/cdrskin. The risk for the
drive is somewhat higher but the overall system is much less at stake.
.br
.PP
If you only got one CD capable drive then you may leave out cdrskin option
\fBdev=\fP. Else you should use this option to address the drive you want.
.br
cdrskin option dev= not only accepts the listed addresses but also
traditional cdrecord SCSI addresses which on modern Linux consist of three
numbers: Bus,Target,Lun. There is also a related address family "ATA" which
accesses IDE drives not under control of Linux SCSI drivers:
ATA:Bus,Target,Lun.
.br
See option -scanbus for getting a list of cdrecord style addresses.
.br
Further are accepted on Linux: links to libburn-suitable device files,
device files which have the same major and minor device number,
and device files which have the same SCSI address parameters (e.g. /dev/sr0).
.br .br
.SH OPTIONS .SH OPTIONS
.TP .TP
@ -153,18 +181,20 @@ Subsequent tracks are data tracks. This option is default and only needed
to mark the end of the range of an eventual option -audio. to mark the end of the range of an eventual option -audio.
.TP .TP
.BI dev= target .BI dev= target
Sets the (pseudo-)SCSI address of the drive to use. Valid are at least the Sets the address of the drive to use. Valid are at least the
X,Y,Z addresses listed with option -scanbus, ATA:X,Y,Z addresses listed with the addresses listed with option --devices,
options dev=ATA -scanbus, the device file addresses listed with X,Y,Z addresses listed with option -scanbus,
option --devices , volatile libburn drive numbers (numbering starts at "0"). ATA:X,Y,Z addresses listed with options dev=ATA -scanbus,
and volatile libburn drive numbers (numbering starts at "0").
Other device file addresses which lead to the same drive might work too. Other device file addresses which lead to the same drive might work too.
.br .br
If no dev= is given, volatile address "dev=0" is assumed. That is the first If no dev= is given, volatile address "dev=0" is assumed. That is the first
drive found being available. Better avoid this on multi-drive systems. drive found being available. Better avoid this ambiguity on systems with more
than one drive.
.br .br
The special target "help" lists hints about available addressing formats. The special target "help" lists hints about available addressing formats.
Be aware that option --old_pseudo_scsi_adr changes the meaning of Be aware that deprecated option --old_pseudo_scsi_adr may change the meaning
Bus,Target,Lun addresses. of Bus,Target,Lun addresses.
.TP .TP
.BI driveropts= opt .BI driveropts= opt
Set "driveropts=burnfree" to enable the drive's eventual protection mechanism Set "driveropts=burnfree" to enable the drive's eventual protection mechanism
@ -355,10 +385,10 @@ not possible to use one of the options listed with --list_ignored_options.
Exit with a nonzero value if no drive can be found during a bus scan. Exit with a nonzero value if no drive can be found during a bus scan.
.TP .TP
.BI \--devices .BI \--devices
List the device file addresses of all accessible drives. In order to get List the device file addresses of all accessible CD drives. In order to get
listed a drive has to offer rw-permission for the cdrskin user and it may listed, a drive has to offer rw-permission for the cdrskin user and it may
not be busy. not be busy. The superuser should be able to see all idle drives listed and
Busy drives are reported as "SORRY" messages on standard error. busy drives reported as "SORRY" messages.
.br .br
Each available drive gets listed by a line containing the following fields: Each available drive gets listed by a line containing the following fields:
.br .br
@ -366,10 +396,6 @@ Number dev='Devicefile' rw-Permissions : 'Vendor' 'Model'
.br .br
Number and Devicefile can both be used with option dev=, but number is Number and Devicefile can both be used with option dev=, but number is
volatile (numbering changes if drives become busy). volatile (numbering changes if drives become busy).
Normal users might not see all drives unless the superuser enabled access
by chmod o+rw
after using cdrskin --devices to get an overview of the situation.
That's why current rw-Permissions are listed.
.TP .TP
.BI fifo_start_at= size .BI fifo_start_at= size
Do not wait for full fifo but start burning as soon as the given number Do not wait for full fifo but start burning as soon as the given number