Difference between .trx and .bin files?

[pbix]

I read the installation Wiki and there is a brief description of the difference between a .trx file and .bin files. It says

The *.bin images are identical to the generic *.trx image, except they have a model-specific header that allows for easy installation.

I would like some further understanding as to what precisely is meant by "model-specific header".

[Eric]

The .bin files are identical to the .trx files, except that there is some extra data at the beginning of the file:

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brcm-2.4 .bin contents:
     [extra header bytes]  [TRX file data]

The extra header bytes contain data used by particular models of router to validate that the firmware is appropriate for the router. Once installed this extra header is discarded.

[sajjadhalai]

firstly We go to linux (ubuntu) and use that command to convert bin to trx

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dd if=openwrt-E2500-v1-squashfs.bin of=openwrt-E2500-v1-squashfs.trx bs=32 skip=1 

then copy output file to router tmp directory through SCP or Telnet or FTP and put command

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 mtd -r write /tmp/openwrt-E2500-v1-squashfs.trx firmware

remember on the end is 'firmware' ,,,,,, not 'linux'
remember it does not preserve your settings