Answer / t.k.chaitanya

major number maps to the device drivers(ex: printer , cd
rom,screen)

minor number maps to the specific device

Answer / daves

The major number identifies the device driver that owns the
device. The major number is mapped to its driver in the
/etc/name_to_major file.
The minor number identifies which driver device instance is
being managed. Each driver has its own numbering convention.
For example, disks are numbered as ((instance # * 8) + slice
#). Others may be numbered sequentially or as the driver
author felt like it.
You can see exactly which driver owns a device in the
/etc/path_to_inst file or sysdef -dD command, among other
places.

Answer / vijay

The driver knows the minor number of a particular device..
For example, the major number of pts is 136..
Assume, we have three pts.. So, the major and minor number
will be as follows..
Device Major number Minor number
pts/0 -> 136 0
pts/1 -> 136 1
pts/2 -> 136 2

Whereas, the Kernel identfies the device using the major
number..

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