Could FreeRTOS support the NTFS file system ?
I don’t think there is any reason why FreeRTOS could not support it. Most people in the embedded space use FAT though and I’m not aware of anybody using NTFS with FreeRTOS.
I’m sure FreeRTOS /could/ support NTFS - if you can get the specifications for NTFS from Microsoft. But since no one else has ever been able to get the documentation (personally, I don’t think MS actually /has/ complete documentation!), I think it is highly unlikely. Implementations other than Windows are all done by reverse engineering.
It would also be possible to take the Linux NTFS filesystem code and port it to FreeRTOS. Of course, you need such a massive amount of processing power and memory to implement NTFS that if your hardware can work with NTFS, Linux is probably a better choice than FreeRTOS anyway.
So yes, in theory it should be possible to use NTFS with FreeRTOS. But in practice it is almost certainly a terrible idea.
I would not want to use NTFS in a product. Microsoft could bring down a big hammer and try to charge a large royalty for using NTFS in a product. FAT 16 has gone through the courts and Microsoft has no claim to it. FAT 32 might be another story. You are probably fine if your volume is low, but once Microsoft sniffs money, then their lawyers are bigger than your lawyers.