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Android devices, entry level Intel, and some Linux type boards comes with varying degrees of quality of internal eMMC Flash storage, that the Firmware, OS, Software & Apps runs from.

There is also cheaper microSDHC cards that can be used for device storage, but they are slower for day to day usage, especially when saving Random bits of Artwork, Thumbnail data etc, that Kodi does regularly - and long term regular, cheap microSDHC is not as reliable.

So it's a trade off, do you want cheap - or something faster, with better long term reliability.

The ODROID N2 has removable high quality, fast eMMC flash storage modules available that can be user configured to any OS you want easily.
The CoreELEC edition of the N2, uses a more robust, Industrial spec. Sandisk microSDHC - but it will still be a bit slower vs eMMC flash storage.

Thank you, so eMMC flash storage can be installed on the N2 simply as plug and play purchasable piece of hardware and swapping the Corelec OS from the default SD card to the new flash drive us doable from a layman's perspective ? Asking because an about to order an N2,