OOO I`m scared

[blobrana]

You could have both connected at the same time...
(with an IDE interface).

Are you sure you want to use SFS, i haven`t that much (good) experience with it.

What OS are you using? I hope that you are running the Os3.9 , as it`s better at recognising the HD.

For some hardware go to,
http://www.amiga-hardware.com/

I personally would have FFS (or pfs)on my machine..

http://www.amigaresource.org/faqs/harddrive.faq.php
or better
http://www.unitechelectronics.com/hardriveinfo.htm

[blobrana]

i would go PFS...(IMHO)

Go ahead and DO IT... it`s fun. Play around, There are a few options that will improve disk operation, but it may not be what you want...
Nothing that will actually harm the drive. ( except low-level format! - don`t ever use that)...
 :-D