Windows start/end of files (How do you know?)

[Sputnik]

I would like to incorporate into a microcontroller (PIC16F84) the ability (when I find out how to interface an MMC card) to read/write the start/end of a file so that it would be recognized by Windows when I put the card in my card slot. Where would I find information on how the start (header) and end of a file works?

Thanks
Sputnik

 

[sshahid47]

hi,
when u use CreateFile on windows, it defines the start of the file, hence what u will do is call CreateFile on windows, write the data and then Write EOF to the file and close the file.

 

[Sputnik]

But how do I do this? I'm quite stupid when it comes to Windows, especially XP!

Sputnik

 

[echo47]

Sounds like you want to read/write an MMC card's flash file system using using a PIC controller. I believe it uses a FAT12 or FAT16 file system. Maybe this SanDisk doc will get you started:
**broken link removed**

I think these guys produced the official spec, but it's probably expensive:
https://www.mmca.org/