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[Translated] Linux FAQs with Answers--How to detect DVD writer’s device ...
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Linux FAQs with Answers--How to detect DVD writer’s device name and its writing speed from the command line on Linux
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> **Question**: I want to know the device name assigned to my DVD writer, and also find out how fast I can burn a DVD using the DVD writer. What is a Linux command-line tool to detect the device name of a DVD writer and its writing speed?
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Most consumer PCs and laptops nowadays come with a DVD writer. In Linux, optical drives such as CD/DVD drives are assigned device names by the kernel based on udev rules at the time of booting. There are several ways to detect the writer's device name and its writing speed.
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### Method One ###
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The simplest way to find out the device name associated with a DVD writer is to use dmesg command-line tool, which prints out the message buffer of the kernel. In dmesg output, look for a potential DVD writer:
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$ dmesg | egrep -i --color 'dvd|cd/rw|writer'
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The output of the above command will tell you whether a DVD writer is detected on your Linux system, and what the device name assigned to the writer is. In this example, the device name of a DVD writer is "/dev/sr0". This method does not tell you about writing speed, though.
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### Method Two ###
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The second method to get information about your DVD writer is to use lsscsi command, which simply lists all available SCSI devices.
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To install **lsscsi** on Debian-based Linux:
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$ sudo apt-get install lsscsi
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To install lsscsi on Red Hat-based Linux:
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$ sudo yum install lsscsi
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The output of lsscsi command will tell you the name of a DVD writer if successfully detected:
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$ lsscsi
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This again does not tell you more details about the writer, such as writing speed.
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### Method Three ###
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The third method to obtain information about your DVD writer is to refer to /proc/sys/dev/cdrom/info.
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$ cat /proc/sys/dev/cdrom/info
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CD-ROM information, Id: cdrom.c 3.20 2003/12/17
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drive name: sr0
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drive speed: 24
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drive # of slots: 1
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Can close tray: 1
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Can open tray: 1
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Can lock tray: 1
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Can change speed: 1
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Can select disk: 0
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Can read multisession: 1
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Can read MCN: 1
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Reports media changed: 1
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Can play audio: 1
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Can write CD-R: 1
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Can write CD-RW: 1
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Can read DVD: 1
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Can write DVD-R: 1
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Can write DVD-RAM: 1
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Can read MRW: 1
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Can write MRW: 1
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Can write RAM: 1
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In this example, the output tells you that the DVD writer (/dev/sr0) is compatible with x24 CD writing speed (i.e., 24x153.6 KBps), which is equivalent to x3 DVD writing speed (i.e., 3x1385 KBps). The writing speed here is maximum possible speed, and actual writing speed of course depends on the type of media being used (e.g., DVD-RW, DVD+RW, DVD-RAM, etc).
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### Method Four ###
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Another way is to use a command-line utility called wodim. On most Linux distros, this tool, as well as its symbolic link cdrecord, is pre-installed by default.
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# wodim -prcap
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(or cdrecord -prcap)
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When invoked without any argument, the wodim command automatically detects a DVD writer, and shows detailed capabilities and maximum read/write speed of the writer. For example, you can find out what media (e.g., CD-R, CD-RW, DVD-RW, DVD-ROM, DVD-R, DVD-RAM, audio CD) are supported by the writer, and what read/write speeds are available. The example output above shows that the DVD writer has maximum x24 writing speed for CDs and maximum x3 writing speed for DVDs.
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Note that the writing speed reported by wodim command will automatically change depending on which CD/DVD media you insert to a DVD burner, reflecting the media specification.
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### Method Five ###
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A yet another way to check DVD burner's writing speed is a tool called dvd+rw-mediainfo, which is part of dvd+rw-tools package (toolchain for DVD+-RW/R media).
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To install **dvd+rw-tools** on Debian-based distros:
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$ sudo apt-get install dvd+rw-tools
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To install dvd+rw-tools on Red Hat-based distros:
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$ sudo yum install dvd+rw-tools
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Unlike other tools, dvd+rw-mediainfo command will not produce any output unless you insert a DVD media to the burner. So after you insert a DVD media, run the following command. Replace "/dev/sr0" with your own device name.
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$ sudo dvd+rw-mediainfo /dev/sr0
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The **dvd+rw-mediainfo** tool probes the inserted media ("DVD-R" in this example) to find out actual writing speed against the media.
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/detect-dvd-writer-device-name-writing-speed-command-line-linux.html
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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Linux 有问必答-- 如何使用Linux命令行检测DVD刻录机的名字和它的读写速度
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> **提问**：我想要知道我的DVD刻录机的名字和在烧录时的速度。该使用什么Linux命令行工具来连测DVD刻录机的设备名和速度？
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如今大多数消费PC和笔记本电脑都配备了DVD刻录机。在Linux中，光盘驱动器，如CD/ DVD驱动器的名字是在引导时内核基于udev规则来命名的。有几种方法来检测刻录机的设备名称和它的写入速度。
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### 方法一 ###
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找出与DVD刻录机相关的设备名称最简单的方法是使用dmesg命令行工具，它打印出内核的消息缓冲区。在dmesg的输出中，寻找一个潜在的DVD刻录机：
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$ dmesg | egrep -i --color 'dvd|cd/rw|writer'
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上述命令的输出会告诉你你的Linux系统上是否检测到了DVD刻录机以及它被分配的名字。本例中，DVD刻录机的设备名称为“/dev/sr0”。虽然此方法不会告诉你的写入速度
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### 方法二 ###
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第二个获得你DVD刻录机的信息是使用lsscsi命令，它只是列出了所有可用的SCSI设备。
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在基于Debian Linux上安装 **lsscsi**:
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$ sudo apt-get install lsscsi
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在基于Red Hat Linux上安装:
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$ sudo yum install lsscsi
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如果成功检测到，lsscsi命令的输出会告诉你DVD刻录机的名称：
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$ lsscsi
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这也不会告诉你刻录机更多的细节，比如写入速度。
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### 方法三 ###
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第三种获取有关你DVD刻录机的信息是参考/proc/sys/dev/cdrom/info。
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$ cat /proc/sys/dev/cdrom/info
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CD-ROM information, Id: cdrom.c 3.20 2003/12/17
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drive name: sr0
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drive speed: 24
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drive # of slots: 1
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Can close tray: 1
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Can open tray: 1
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Can lock tray: 1
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Can change speed: 1
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Can select disk: 0
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Can read multisession: 1
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Can read MCN: 1
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Reports media changed: 1
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Can play audio: 1
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Can write CD-R: 1
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Can write CD-RW: 1
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Can read DVD: 1
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Can write DVD-R: 1
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Can write DVD-RAM: 1
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Can read MRW: 1
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Can write MRW: 1
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Can write RAM: 1
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本例中，输出会告诉你DVD刻录机（/dev/sr0）与x24的CD刻录速度（即24x153.6 Kbps）兼容，且相当于x3的DVD写入速度（即3x1385 KBps的）兼容。这里的写入速度是最大可能的速度，而实际的写入速度当然取决于使用的介质（例如：DVD-RW、DVD + RW、DVD-RAM等）。
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### 方法四 ###
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另一种方法是使用一种称为wodim命令行程序。在大多数的Linux发行版，这个工具以及它的软链接cdrecord都是默认安装的。
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# wodim -prcap
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(or cdrecord -prcap)
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如果不带任何参数调用时，wodim命令会自动检测到DVD刻录机，并显示出详细的功能以及它的最大读取/写入速度。例如，你可以找出刻录机支持哪些媒体（如CD-R、CD-RW、DVD-RW、DVD-ROM、DVD-R、DVD-RAM、音频CD），以及有哪些如何读/写速度。上面的例子中输出显示，DVD刻录机对于CD拥有X24最大写入速度，对于DVD有X3的最大写入速度。
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需要注意的是wodim命令报告的写入速度会随您插入到DVD刻录机的CD/DVD介质的改变而改变，这反映了媒体规范。
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### 方法五 ###
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还有一个方法来检查DVD刻录机的写入速度的是一个名为dvd+rw-mediainfo的工具，这是dvd+rw工具包（DVD+-RW/R媒体工具链）的一部分。
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在基于Debian 发行版上安装 **dvd+rw-tools**
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$ sudo apt-get install dvd+rw-tools
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在基于Red Hat 发行版上安装 dvd+rw-tools:
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$ sudo yum install dvd+rw-tools
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不像其他工具， dvd+rw-mediainfo命令不会产生任何输出，除非你插入DVD光盘到刻录机中。所以，当你插入DVD光盘后，运行以下的命令。用你自己的设备名称替换“/dev/sr0”。
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$ sudo dvd+rw-mediainfo /dev/sr0
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** dvd+rw-mediainfo**工具探测插入的媒体（本例中是“DVD-R”），以找出对媒体的实际写入速度。
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/detect-dvd-writer-device-name-writing-speed-command-line-linux.html
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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