Hm I thought you cannot anymore install eCS on FAT, can you?
Anyway, that is off-topic.
You can't. From what I can remember FAT installation in eCS has never been possible in eCS.
Anybody welcome to correct me.
Apart from that you have no long file name support. So some programs will not work.
Just one quick example I could find in Firefox: plugin-container.exe.
Now maybe you can rename it to 8.3 file names. But you are bound to run into some software maybe needing file names longer then 8.3.
Apart the above pretty limiting factor. I also think that in terms of reliability FAT would be the wurst off in terms of when you get a crash... Then again not that weird as the FAT is the oldest file system. around...
With HPFS, JFS and FAT I have had system crashes. But FAT certainly gave the most damage. Its true HPFS and JFS can also blow up and CHKDSK can then "repair" your partition. But by far most blown up OS/2 installation for me happened on FAT volumes.
Lastly the performance drain you would have with FAT. While I know some people still using HPFS.
JFS also has the large file system cache... A few months ago I did see Firefox load from a HPFS partition...
It works but its certainly putting your computer back in first gear, instead of making it work snappy.
Roderick