I'm a bit confused about the use of 'disk' for storing stuff on a mikrotik router.

First, under store I see my micro-sd card as 'ready' (I formated). Next, under system logging I have name 'disk' set to 'disk' (there is no micro-sd option for type). And third, under graphing I have 'save on disk' checked.

So, are these files actually being written to the sd-card , or memory? Using the built in stores feature of winbox I see my 'sd-card', but I change into that folder to see the contents. I see a /sd-card/lost+found and /sd-card/web-proxy so perhaps one can't view subdirectory contents, but should I see a /sd-card/logs or /sd-card/graphs?

Thanks!