pfs ok i have heard of it...if i install it does it change my main drive ? ..do i need a serial no or is it free ? ..just wanna format the drive fully..not change my whole system..
You can format one drive as PFS, or all your drives, it won't change your main drive unless you tell it to. You may want to leave your main drive alone and just format the external drive with PFS until you're more familiar with it. It's free, search for the 5.3 installer on Aminet and the latest AIO-handler, then search for a thread on this forum with a comment by user @Paul1981 that actually explains how to install it (the docs are useless, LOL).
As for FAT95... you only need that if you intend to swap the drive onto a PC to transfer files. For example I have an SD card in my system formatted as FAT32 that i use with FAT95. If I want to copy files onto my PC I just put them on the card and plug it in to my PC. Conversely if I want to copy files onto my Amiga I dump them onto the SD card and plug it into that. If you have no need for this capability then you have no need of FAT95.