a question about block and buffer sizes in HDToolBox with OS3.1.4

[klx300r]

so I've got the latest OS3.1.4 installed and happy in my A1200 but when I installed it I quickly flew through the HD install process and left the block size at 512kb and buffers at 30. I don't have a clue with the directSCSI tick box is so I left it blank.
QUESTIONS: I have a 16GB DOM working fine with FFS now BUT

1- should I change the block size to 4096? (I know I'll have to load up a ton of stuff already on it if I do)
2- should I change the buffer size to more than 30?

[klx300r]

Thanks for the quick answers Thomas much appreciated!
for question 2 do you mean chip or fast? if fast i've got plenty (32MB).  Also what determines the optimum buffer size?

[klx300r]

thanks to all that responded...great info!
I think i'll just leave my buffers in HDToolBox at the default 30 then