The linux /dev directory contains the special device files for all the devices.

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Drive assignments changing

I have an Ubuntu 14.04 Server machine set up with 3 drives: Two 2TB HDDs, and a 4GB USB drive for system. It seems that every time I boot the system it changes what drives are assigned to ...
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91 views

Micro SD impossible to modify (write or format)

Recently i had problems with my SD card used for my android device, basically i cannot modify it (write or format). Only read it, if i try format or write, any time that connect and fisconnect from ...
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29 views

Cat to /dev/audio not working

I downloaded some files and am trying to cat them to /dev/audio (for fun of course, I'm sure I could just play them) and I guess this is supposed to work, but it doesn't? I get permission denied and ...
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Can't mount external HDD. Device listed at lsusb but doesn't appear at /dev

Device works at Windows but doesn't appear at /dev. How can I mount it? So let's go to the infos... uname -a: Linux deeptought 3.13.0-30-generic #54-Ubuntu SMP Mon Jun 9 22:45:01 UTC 2014 x86_64 ...
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/dev/dsp missing in debian and cannot hear festival utterance

Tried to make an utterance in festival and it seems /dev/dsp/ is missing in the debian. How to add this? festival> (SayText "Hello") Linux: can't open /dev/dsp #<Utterance 0xb669c708>
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Trying to set speed at 921600 using stty

I have been trying to communicate via USB with my device and have been so far unsuccessful. I believe the problem lies in the speed that the computer has set for it, in stty the speed is 9600, ...
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36 views

Can't recongnize my SSD device file in /dev

I am using Ubuntu and can't find my SSD device file. The /dev directory has following contents: agpgart audio audio1 audio2 audio3 audioctl char console core dsp dsp1 dsp2 dsp3 fd full kmem kmsg log ...
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Updating kernel on a Chromebook to prep for Chrubuntu

Pretty simple question: I have read that by setting my Chromebook to the dev channel, it will install a later kernel. Currently it's 3.4.0, and it'd install 3.8.0 (64-bit, no less). However, after ...
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Why does the /dev directory exist?

In Linux, there is the /dev directory, which is a special directory which contains all of the files for devices and other things like random, urandom, etc. Why did this directory exist? Was it just ...
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Failed to mount /dev when running Arch Linux in coLinux

I have got coLinux 0.7.9 with Linux kernel version 2.6.33 (coLinux-0.7.9.exe), and the original ISO file for Arch Linux 2014.04.01 (archlinux-2014.04.01-dual.iso). I booted with the Arch Linux Live ...
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Does unplugging a disk from linux change disk name after restart?

I had 5 disks (sda, sdb, sdc, sdd, sde) sda is being used for root and boot. sdc,sdd and sde disks are being used by lvm. We unmounted and unplugged the sdb, now I need to restart the server. I am ...
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100 views

Hauppauge HD PVR 2 to ffmpeg on OS X

How can I use ffmpeg to capture video and audio from a Hauppauge HD PVR 2 connected to my Mac via USB? I have seen a couple posts here and here about doing this on a Unix machine (not OS X) using ...
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1answer
293 views

Disable device node using udev (/dev/sr0)

I am trying to disable udev from generating /dev/sr0 device (my cdrom) and Im trying to write udev rules. I added a file 10-cd-trial.rules in /etc/udev/rules.d and /lib/udev/rules.d, the contents ...
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Partition Not Showing up in /dev

I recently unmounted a 4TB hard drive from one computer in order to access the files directly from another computer. It seemed like there were no problems with the unmounting process. When ...
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2answers
101 views

How to move /dev/random to another drive on a server

We found a bottleneck in our server (hosted on HDD) related to the /dev/random function. We want to have the OS use the /dev/random that is on our SSD drive rather than the HDD. How can we have the ...
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Why does `cat /dev/urandom` break your terminal?

In reference to this question: http://serverfault.com/questions/534449 How does cat /dev/urandom make some terminal emulators go wonky?
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Mac OSX - Why is /dev/rdisk 20 times faster than /dev/disk

According to the rasbery pi documentation, You can load your OS to a flash card with either /dev/disk or /dev/rdisk. rdisk stands for raw disk. /dev/disk is a block level device, why would rdisk ...
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What is /dev/blog?

I have tried searching for /dev/blog on google, duckduckgo, etc.; but I cannot find any information about it. I've also asked another sysadmin where I work, but he didn't know what it is used for ...
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185 views

Can't find /dev/root

I am having hardware issues with my main laptop, so until I get it fixed I am trying to use its hard drive on my old laptop. I am using a SATA-USB converter to boot on it. The problem is when I try ...
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137 views

Ubuntu Drive Mount Order

I have two drives, a 120GB SSD and a 2TB HD. I set the BIOS to boot from the SSD, and an the Drives window of Ubuntu it tells me the SSD is SDB and the HD is SDA. I would expect the SSD to be SDA ...
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Is there a device file in the /dev directory that represents the wireless adapter?

I've been exploring the /dev directory and am curious are all the devices mapped to those files there? Specifically I'm looking for a wireless file. I was hoping to find something like /dev/wifi or ...
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USB pen drive not getting assigned anything in /dev/

dmesg | tail -f: [17597.228060] usb 1-1.3: new high-speed USB device number 11 using dwc_otg [17597.330548] usb 1-1.3: New USB device found, idVendor=18a5, idProduct=0300 [17597.330580] usb 1-1.3: ...
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79 views

Should a dev team use a local database or a remote shared one? [closed]

I'm part of a team of developer and today, we do our developments against an Oracle 11g database installed on our own machine each. I would like to know your point of view about this way of working ...
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what's the easiest way to match up /dev/sdx with a device mounted in /media?

I can never remember which device is what so when it comes to partitioning, etc. I'm afraid of messing up the wrong drive. Automounted devices like external drives don't seem to turn up in fstab. So ...
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493 views

Mount TMPFS instead of ro /dev

I am working on a ARM-Based embedded system with a custom Debian Linux based on kernel 2.6.31. In the final system, the Root file system is stored as squashfs on flash. Now, the folder /dev is created ...
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What's '2>&1' and '/dev/null'

I have been browsing through scripts and see 2>&1 & /dev/null everywhere. What are they? After googling, is it different for OS X than for Linux?
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1answer
2k views

What is sda1 used for?

I have two partitions: C: and D: (shown in Windows). Then I installed Ubuntu and found out that /dev/sda represents a SCSI disk and a number after sda represents a partition. Now, I assumed I have 2 ...
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Ubuntu installation will not boot, throws error missing file: /dev/sdc1

I tried to install Ubuntu 12.04 and received the continuous message loop: udev[number]: timeout: killing '/sbin/blkid -o udev -p /dev/sdc' [number] I suspect this error happens due to a missing ...
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298 views

sound detection accessing device node directly

I am attempting to invoke a bash action triggered by audio input. A very simple sound detection sensor (no record) with adjustable threshold utilizing a pc's onboard audio chipset and audio microphone ...
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1answer
761 views

restore /dev after `rm`ing it

during a gentoo install from the livedvd, there's one step to create a dev dir to be used later in the chroot of the target for the instalation it's done like that mount --rbind /dev /mnt/gentoo/dev ...
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Use /dev/shm sometimes crashes applications

Sometimes I use /dev/shm for temporary files, as big as 500MB, (I have 8 GB RAM - Ubuntu 11.04 x86-64) and when I load StarCraft II (with wine) I might get memory errors in the game (corrupted data or ...
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279 views

Why is the ownership for /dev/input/eventX set to “root”?

Why are /dev/input/eventX permissions/ownership set to crw-r----- root.root? Then no unprivileged user application can program the mouse. According to what I've read it's due to security reasons, and ...
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348 views

/dev/sda1, /tmp,/dev/shm

I'm actually putting some files into temporary folder /tmp. And I want to know the capacity of /tmp. I do the 'df -h': Filesystem Size Used Avail Use% Mounted on /dev/sda1 ...
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How can I know what device the file in /dev is mapped to

I have installed a new device in linux. If I enter lspci, i can see the information of this device. But, I do not know which file in dev is mapped to this device.
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Linux: Find out /dev description for a device

I have a microphone that I connected via USB. When I do dmesg it shows [37830.040274] usb 5-1: new full speed USB device using uhci_hcd and address 4 How do I find out what /dev/??? identifier has ...
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Adding devices elsewhere on a network to /dev

I was wondering if it were possible to add devices to my computers /dev folder over a network. In linux philosophy, everything is treated as a file, and if I can have my /home/user1 and /home/user2 ...
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Control device labels in /dev

I have an HP xw8200 workstation running linux with two small, fast SCSI drives hooked up to the onboard LSI SCSI controller. The drives get labeled /dev/sda & /dev/sdb in /dev, respectively. I ...
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What is /dev/mem?

Presumably it's somehow related to memory? What would sudo cat /dev/urandom > /dev/mem do? Trash all RAM? All non-kernel virtual memory? None of the above?