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English Grammar- Much Many A Lot of

English Grammar- Much Many A Lot of

Hi, my name is Valen and this is a grammar lesson on the uses of the words much, many and...

在Linux系统下将Raspbian系统镜像写入SD卡

在Linux系统下将Raspbian系统镜像写入SD卡

树莓派是一个由ARM处理器驱动的廉价小巧的单板机。虽然它主要是为了帮助儿童学习计算机编程而研发的,但同时它也是一个多功能设备,被DIY发烧友和计算机爱好者用于很多实用且有趣的项目。 树莓派使用SD卡作为存储设备,操作系统安装在SD卡里。SD卡可以被视为树莓派的硬盘。在这篇教程中,我将介绍如何在Linux系统下将Raspbian操作系统镜像写入SD卡中。Raspbian基于Debian,是专门为树莓派而开发的操作系统。Raspbian镜像文件写入SD卡的过程就是安装Raspbian操作系统的过程,这与一般桌面系统的安装方式有所不同。 准备工作 并不是所有的SD卡都被树莓派兼容。推荐使用Class 10并且容量大于或等于4G的SD卡。在写入过程开始前,请在官方网站下载Raspbian镜像文件。不习惯看英文的童鞋也可以点此链接下载Raspbian种子文件。在写这篇教程时,最新的版本是2015-05-05。 将镜像文件写入SD卡 我们下载的Raspbian镜像文件是用zip格式压缩过的,首先我们需要将它解压。在终端中将目录切换到下载目录,然后输入下面的命令解压Raspbian镜像文件。解压后我们得到的是一个img格式的镜像文件。 unzip 2015-05-05-raspbian-wheezy.zip 将SD卡插入SD读卡器,然后插入电脑USB端口。然后我们需要确认SD卡的设备名称。我们可以使用fdisk工具。在终端中输入下面的命令。 sudo fdisk -l 在命令的输出结果中,我们可以从容量大小来辨别SD卡。例如下图,我的SD卡是7.5GiB,设备名称是/dev/sdc。 我们不需要在SD卡上创建分区。我们接下来使用的dd命令将擦除SD卡里所有的数据。将工作目录切换到Raspbian镜像文件所在目录,然后输入下面的命令,将Raspbian镜像文件写入SD卡。在命令执行前,最好是将其他正在运行的程序关闭,否则可能会导致写入失败。 sudo dd if=2015-05-05-raspbian-wheezy.img of=/dev/sdc 在上面的命令中,if参数用来指定镜像文件的路径,of参数用来指定SD卡的设备名称。我使用的SD卡设备名称是/dev/sdc。读者需要根据自己的情况进行修改。因为Raspbian镜像文件解压后的大小是3.05GiB,而且SD卡的读写速度又比较慢,所以写入的过程会比较长。(在我电脑上用了19分钟)。如果你需要看dd的写入进度,那么请看这篇文章...

English Vocabulary- Wish & Hope

English Vocabulary- Wish & Hope

Hi my name is Valen and this is a lesson on how to use the words wish and hope. So...

English Grammar- Negative Forms of Must & Have To

English Grammar- Negative Forms of Must & Have To

Hi my name is Valen and this is a grammar lesson on how to use must and have to in...

English Writting- Using Apostrophes

English Writting- Using Apostrophes

Hi my name is Valen and today we’re gonna do a grammar lesson on how to correctly use apostrophes. Now...

Love & Relationships-Expressions and Vocabulary

Love & Relationships-Expressions and Vocabulary

Hi my name is Valen and this lesson is on expresson about the love. So we’re gonna do seven common...

Here & Hear – Commonly Confused Words in English

Here & Hear – Commonly Confused Words in English

Hi my name is Valen. And this is a lesson on the homonym here and hear. So homonym are two...

Expressing Time in English

Expressing Time in English

Hi my name is Valen and this is a lesson on different ways to express time. Ok so when someone...

all ears, all in your head, all in a day’s work

all ears, all in your head, all in a day’s work

Hello, my name is Valen. And this is lesson on idioms. So an idiom is a phrase that uses Engish...

More common workplace expressions

More common workplace expressions

Hi, my name is Valen. Welcome to Engvid.com. This is a lesson on common expressions in the workplace. So idioms...

Business English- 7 Common Workplace Abbreviations

Business English- 7 Common Workplace Abbreviations

Hi, my name is Valen. And this is lesson is on common English abbreviations that you will find in the...

7 Workplace Expression in English

7 Workplace Expression in English

Hi my name is Valen. Welcome to Engvid.com. This is a lesson on common English expressions that you hear in...

English Grammar- Comparative Adjectives

English Grammar- Comparative Adjectives

Hi there. My name is Valen. And this is a grammar lesson on comparative adjectives. So an adjective is a...

10 Common Expressions in English

10 Common Expressions in English

Hi there. My name is valen. And this is a lesson on very common English expessions. We’re gonna go through...

7 Common English Expressions about Money $$$

7 Common English Expressions about Money $$$

Hi there. My name is valen and this is a lesson about common English expressions about money. So we’re gonna...