Universal Serial Bus (USB) establishes a connection between devices and a host computer.

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find serial com port

I'm using a CH341-UART Converter for sending some string data to USB port. How can I find the COM port number for connected device? For example in this program: import serial ComPort = serial....
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42 views

What format gives photorec to files?

I have to recover a file from my usb. I didn't find it on the net. How does photorec call files of unknown format? For instance, I have a file named *.jks . How can I find it in the recovered ...
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1answer
175 views

How to check the erase block size of a Usb flash under Linux?

How to check the erase block size of a USB flash under Linux? Someone said /proc/mtd might be helpful, while for my Centos7 server, there isn't such file. Thanks in advance. Updated on Jan 28 2016: ...
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2answers
111 views

I can't access my USB device after mkfs.ntfs command

I had used these commands (as root): umount /dev/sdb1 After, mkfs.ntfs /dev/sdb1 It took a long time to format it and I couldn't wait it. Before it finished formatting, I had canceled operation. ...
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44 views

Unable to mount USB media in sagem fast3304 V2 router (busybox v1.01 inside)

I have a wireless router that runs busybox (V1.0). A media server (Twonky Media Version 3.4) running on this router. I would like to use its USB port to mount an external drive containing mutltimedia ...
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0answers
45 views

How can I figure out why an HID unikey device is not being recognized by the software needing it?

I have a custom built CentOS machine. For those of you who know Vagrant, the image is at https://atlas.hashicorp.com/puppetlabs/boxes/centos-7.2-64-puppet. When I connect an HID Unikey device to this ...
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2answers
72 views

How to recover a totally dead USB?

I have been loading a USB with an .iso image to run Ubuntu live. It worked on Apple and did not on other laptops. After wiping, re-downloading, re-formating, re-partitioning to try make it work, it ...
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357 views

How to install DisplayLink driver on LinuxMint 17.3

I have a USB 3.0 docking station connected with my laptop having LinuxMint 17.3. I can't manage to install DisplayLink driver on it. I could make it work with Ubuntu 15.04, but with LinuxMint it wan't ...
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122 views

Is there a general USB 3.0 support in OpenWrt?

the only information i found about this topic is outdated since 2011/02: it says there is no support for devices with usb 3.0 "so far"! according to the german wikipedia since version 2.6.30 the ...
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66 views

How to install ubuntu on live USB stick that I booted from?

I have a old netbook with single USB port and broken harddrive. I've somehow aquired a 16gb lubuntu 15.10 willy live USB. I want to use this as primary OS on my netbook. Since I don't have access to ...
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173 views

USB Bluetooth dongle not working

I am struggling to get my bluetooth adapter work on my Linux desktop. I see it when I plug it in, but basically, nothing else works correctly: $ lsusb Bus 002 Device 006: ID 0a12:0002 Cambridge ...
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1answer
80 views

How do I load a kernel module later in the boot sequence?

I've been experimenting with the g_mass_storage kernel module. I first tried loading it by putting it in /etc/modules and the options in /etc/modprobe.d/file.conf This worked, but when I connected ...
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138 views

How do I mount a USB external hard drive in RHEL rescue mode

I had a boot failure on a RHEL 6.2 machine and I can now only start it in rescue mode with the recovery CD. I would like to move all the data to an external USB-mounted drive but I am having problems. ...
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109 views

How can one determine whether an internal SD card reader is connected to internal USB3 hub?

I have a Dell Chromebook 11, which has two external USB3 ports, and an SD card reader. I am trying to establish whether buying a fast SD card would be worth it, compared to a fast USB stick, as a ...
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1answer
20 views

How to recycle USB device names on Linux after forced removal

When a mounted USB stick is manually unplugged (without unmounting it) the device name in /dev (e.g. /dev/sda ) is somehow reserved, plugging it on again will yield on my system the alphabetically ...
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15 views

stty: /dev/dtyU0: Invalid argument (NetBSD USB to serial interface)

I'm trying to interface a USB oscilloscope (Syscomp CGR101) to NetBSD. The 'scope has an FTDI USB-to-RS232 interface inside it. When I try stty -f /dev/dtyU0 I get back "Invalid argument" whether ...
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43 views

udev: Wrong symlink is made at boot time

I am trying to create a udev rule to give a static name to a ttyUSB (a FTDI USB serial cable). My rule is quite simple (the file is named 99-usb-serial.rules): KERNEL=="ttyUSB?", ATTRS{serial}==...
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56 views

How to give a custom name to a serial device on connection?

I am working on ROS under Ubuntu 14.04 on an Odroid XU3 (ARM dev board). I connect two USB devices to my dev board which are recognized as ttyACM0 and ttyACM1 according to the time when they are ...
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1answer
69 views

My printer in /dev/usb/lp0 always disappear after few seconds, and can't print, how to fix it? (Ubuntu 14.04)

Please, help... I have a 'EPPOS Model EPT-58H' thermal printer. When I plugin via usb, it detected as /dev/usb/lp0 with ls -l /dev command. Then I run echo "sometext" > /dev/usb/lp0 in terminal to ...
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265 views

Multiple (combine) USB sound cards with Alsa + Jack + Pure Data

I'm a musician and I'm new to PI/Raspbian/Linux. I'm using a Raspberry PI 2 with Pure Data (PD) for a multichannel audio installation. I have one 5.1 USB soundcard (6 channels) but for my installation ...
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1answer
43 views

Is host-to-host file transfer possible using USB Type-C?

I'm doing a warranty replacement on my Chromebook Pixel 2, and want to transfer data from one laptop to another. The Pixel 2 has two USB type-C ports. I'm running Arch Linux on the old one. I'd like ...
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77 views

Struggling to boot linux with full disk encryption from USB

I would like to be able to boot linux (mint or ubuntu preferred) on my desktop from a fully encrypted USB stick. Apparently this is possible, however the solution has eluded me. Please forgive my ...
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100 views

Ubuntu Mint 17.2 ,USB Mouse and Keyboard sometimes only works in Safe Mode

Occasionally , when I restart the computer. The usb mouse and keyboard do not work by the time its ready to log in. They always work in safe mode, and the keyboard and mouse always works on the duel ...
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1answer
33 views

LCD USB communication

This is on Arch Linux. I connected it and using dmesg I got the output: [ 78.637285] usb 5-2: USB disconnect, device number 3 [ 78.953772] usb 5-2: new full-speed USB device number 4 using ...
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1answer
44 views

Error copying file in mounted usb

I'm formatting an USB pen drive. For this I run the following commands: First umount the device: sudo umount /run/media/myuser/folder_where_is_mounted (I'm runing manjaro and is in /run where ...
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113 views

Yumi + mint 17.3 = login screen

I want to create a mint usb installer. When I do, and I try to install, mint comes up with a login screen. Tried various combo's of names and passwords, nothing works. Nothing else to do but ...
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3k views

Qemu USB passthrough (windows guest)

I have a USB ADC/DAC and a HASP protected proprietary data acquisition system for it, both of which do not work in linux. I am trying to make it work in Windows virtual machine using qemu. Here are ...
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111 views

usb-device number changes over time

I am trying to use on my RP a camre usb device - Logitech, Inc. Webcam C270. When I connect it directly to the USB port of the RP, other USB devices stop working (such as WIFI device) I guess this is ...
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1answer
47 views

USB automount call another x-session

I have FreeBSD 10.2 installed with Openbox as wm. When I put flash drive in USB new instance of openbox starts automaticaly. I don't undestand why. /etc/rc.conf # Hostname hostname="dark" ...
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28 views

How often does the tcpdump save into the file

I've got an question, concerning the tcpdumd. Does it save the data directly in the File you can give it with -w, or does it save when it's stopped? So if it was writing on a usbstick, can I just ...
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113 views

My computer freezes after selecting an option in the gnu grub. What do I do?

My mom had a computer. She downloaded some music illegally, and now it doesn't work. I decided to try to install ubuntu on it (I made a bootable usb stick on another computer). The usb stick works ...
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1answer
91 views

Embedded linux hotplug changed mount point

I have a linux media player that was very common before android's age. It is a MIPS running Linux Venus 2.6.12.6 and has 2 sata, 2 usb and 1 sdcard port. Since the flash memory is very limited, I ...
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2answers
158 views

Setting up a WLAN usb stick

I'm trying to make the WLAN USB stick connect to a wireless network. There was an official Linux driver available for download (v4.0.2_9000.20130911, which supports my Linux kernel version) and I ...
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2answers
66 views

How to unmount an usb stick from a script which is on the usb stick?

How I can I unmount a usbstick right from the script which does kill itself. Because i'm running the script from the stick it's not possible to just unmount it because theres always the error: device ...
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79 views

Why does my camera not show up in /dev although it does in dmesg? (Possible Ubuntu regression.)

A while ago I could plug in my Canon via USB and it would get mounted as an external drive. Nothing has been reconfigured in the camera, but now if I plug it in $> dmesg [103943.225623] usb 1-2: ...
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143 views

Having a computer act as a virtual USB slave device rather than as a host

I'm only moderately proficient with USB protocols and linux in general, so please bear with me. I have a use case where I want a virtual hard disk (particularly, on a freeNAS installation) to act as ...
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1answer
49 views

Dell 3110cn USB printer not detected

I have a Dell 3110cn printer that I was previously using as a network printer with success on my ArchLinux box. Now I have to use it as a USB printer (I can't use LAN anymore) but it is not ...
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0answers
45 views

How reliable is g_serial?

I am building an embedded device with linux inside, using Ethernet to communicate with its host. Now I need to switch to USB. The only thing I need from USB is a pair of bulk pipes, exactly what ...
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1answer
74 views

Attaching a phram mtd0 device to gadget serial mass storage

I'm using a Atmel SAMA5D3, I have created two phram devices /dev/mtd0 and /dev/mtd1 I am trying to attach them to a gadget mass storage module. insmod g_acm_ms.ko file=/dev/mtd0,/dev/mtd1 The ...
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1answer
48 views

ClamAV installation problem?

My USB has windows viruses in it. Before attaching it to device(windows installed), I want to delete these viruses but i have kali installed device also from which I want this action to be done. I got ...
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19 views

USB behavior changes when laptop is plugged

I have a USB camera (from IDS) and I wanted to plug it to my new laptop. I installed the software and everything was fine until all frames dropped. After an long investigation I finally understood ...
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2answers
55 views

“USB HDD” option replaced by “ubuntu” in BIOS, now cannot use USB boot media

So, being foolish old me, I tried to use os-uninstaller to remove my Windows installation and make way for Arch Linux. Unfortunately, now nothing on this computer boots, and I cannot even boot from a ...
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1answer
67 views

Detect Viruses in USB?

My USB pen brings often Windows Viruses in it. Before attaching it to windows again I would prefer to delete viruses. I have Kali Linux. Is there any way to detect Windows viruses/threats through ...
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113 views

Unable to access SD card on Debian Stretch

I can't access my SD card, not via the internal SD card reader of my laptop, nor via an external SD card reader. I tried to use dmesg to find the cause of the issue, but when I attach the SD card to ...
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134 views

Install wireless usb on CentOS 7 (VMWare)

I am very new to Linux. I have installed CentOS 7 on a virtual machine using a windows host. I am wanting to install my USB wifi dongle so it can be used on the CentOS 7 guest. (My windows does not ...
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86 views

Kali on Intel Processor

I'm attempting to install Kali on my Razer Blade laptop, which runs an Intel i7-4702HQ processor, from a bootable USB drive. I have one partition running Windows 8.1 and am trying to get Kali on a ...
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29 views

Connect Automatically to network with authentication Without Encryption on BeagleBone Black

I'm a new user to Linux, I develop a project in which using BeagleBone Black board with Debian, in which I need connect the board automatically to open networks detected via WIFI (authentication ...
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1answer
89 views

How can I query a USB device and know it is alive?

I'm using Raspbian on a Raspberry pi 2. I have an RFID reader connected to it via USB. My problem: The RFID USB device becomes unavailable at intermittent times and power cycling the device does not ...
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1answer
68 views

Can the OS affect USB speeds?

Via a usb 2.0 port I am currently getting transfer speeds averaging at 17mb/s with bursts up to 26 mb/s, the ram and processor are barely being touched and this transfer speed affects all devices, ...
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53 views

use bootable disk to redirect to flash drive

So, here's a crazy request. For reasons unknown, I'm working with a BIOS which doesn't have to option to boot from USB devices, but I really want to boot off my flash drive. The BIOS does allow me ...