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Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.
Embedded Filesystems Library
A solution for memory cards etc. - an universal FS library in the C language.
A quote from EFSL web: The EFSL project aims to create a library for filesystems, to be used on various embedded systems. It is our intention to create pure ANSI C code that compiles on anything that bears the name 'C compiler'. We have support for FAT12, FAT16 and FAT32. Code runs on PC (GNU/Linux, development enviroment), TMS C6000 DSP's from Texas instruments, and ATMega's from Atmel.
You can use this code with as little as 1.5 kilobyte RAM. The more memory you commit, the better the performance will be.
Read more: EFSL