Dreamcast games working 100% on sd card

[sundance]

It's an old thread, but since this statement is reported in many places,

I was wondering if there is any reason for cluster sizes of 64 KB
to be any better than more "classical" cluster sizes of 32 KB.
Could it be related to some kind of internal buffer size ?

Asking as I recently switched my sdcard to 64 KB clusters due to this thread,
and noticed my Dreamcast+Dreamshell system becoming unstable as a timely consequence of this change
(games would crash and reboot the console at random times).