Question about which tools to use, bugs, the best way to implement a function, etc should go here. Don't forget to see if your question is answered in the wiki first! When in doubt post here.
If you are just starting out then your OS is probably on a floppy. I recommend supporting the FAT system. There are much tutorials and documentations on it.
Anything is possible if you put your mind to it.
ComputerPsi
possible? yes, but not recommended -- if you alter the format, then it may become unreadable by other OSs, and it really isnt the same filesystem anymore
NTFS is possible, (but it is much more complicated), FAT is actually quite easy to implement (also allows the disk to be used under almost any OS -- making the disk very portable, allowing the transfer of files between OSs)
Here is fasm code to find and load a file, from a ntfs hdd, now if you can find and load one file from ntfs, then your half way there . http://shade.msu.ru/~msu-se/mtldr.rar