What are the extraneous files on my SD card

[RockDawg]

I've been curious... What are those "non-picture" files on my SD card? For example, my card contains NIKON001.DSC in the root of the card and a folder named MISC that contains ORDER.NJB and TRANSMRK.NJB.

What are these and what are they used for. I assume they are used by the camera, but for what?

 

[Buszaj]

Perhaps they are used by the camera in order to number files properly, sort them. Most likely due to the camera formatting the card. Don't delete them!

 

[Garbz]

Nikon001.dsc is automatically put on the card during formatting. It means nothing as far as I can tell. It's a completely empty file with 512bytes of the value 00 in it.

The other two are indexing files of some sort. I'd say ignore them.

 

[RockDawg]

I assumed I should ignore and leave the files on the card, I just wondered what they are for.