如何通过`lsusb`列出的总线号和设备号在`/dev`中找到设备文件？

Question

When I attach removable USB hard disk to my computer, I can distinguish it from others via the name of manufacture and device name. However, I can't exactly know what is the device file in /dev (eg sda, sdb, sdc...) corresponding to this USB storage device.

Is there a way to find out the device file according to the output of lsusb ?

Answer 1

I always do like this: If this USB device is the last one to remove/insert, you can get it from 'dmesg'. you can easy to see sdxxx in dmesg print out. that's what your need.

Answer 2

You can know exactly the /dev/path/to/your/device using lsusb .

Sample output:

Bus 002 Device 008: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

According to the previous example, you can locate the char device that corresponds to the Logitech USB receiver ( for wireless mouse and keyboard ) by examining the two numbers before the colon ( : ).

It would be /dev/bus/002/008
Notice the last two numbers ( last directory then the char device file itself ).
They are the same as the first two numbers in the line that says Logitech, Inc. Unifying Receiver .

So the path is always /dev/bus/ [first number] / [second number] .