This long listing includes columns showing major and minor numbers for each device.
The sd driver manages all of the devices listed in the previous example that have a major number of Minor numbers are listed after the comma. This file is maintained by the system and is undocumented. See All Related Store Items.
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To list the available major numbers for a system Use the command: haremajor -a 54, To reset the major number on a system You can reset the major number to an available number on a system. For example, to set the major number to 75 type: haremajor -s Prev Up Next Appendix J.
Appendix J. Major number is a unique number which specifies a particular driver. When any application in user space open any device file , kernel check major number associated with that device file and identify which driver is responsible for handling this request.
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After that any subsequent calls for that particular device is passed to same driver. A single device driver can handle multiple devices or controllers. So whenever any request for such kind of devices comes to kernel , kernel has to differentiate between devices or controllers.
To differentiate between devices , every device in linux system provided a unique number which is called minor device number. We can say that Minor number represents a device and major number specify a driver. From above image we can see a driver which has major number 4 is handling three devices device0, device1, device2 having minor number 3,4 and 5.
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