I think my missunderstand depends also on my bad english?

Am 30.11.2020 21:51 schrieb antlists:

On 30/11/2020 20:05, David T-G wrote:

quoted

You don't see any "filesystem" or, more correctly, partition in your

   fdisk -l

output because you have apparently created your filesystem on the 
entire
device (hey, I didn't know one could do that!).

That, actually, is the norm. It is NOT normal to partition a raid 
array.

In my understanding you are contradicting yourself here.
Is there a difference between
   "create filesystem on the entire device"
and
   "partition a raid array"
?