Suggest user to format SD card if it can't be read by Specter DIY

[aglkm]

Specter DIY can read SD cards formatted to fat 16/32.
It would be nice if the device could detect that a card has a different format and suggest a user to re-format it within the device.

Or/and a meaningful error message that the device can't read SD card and a suggestion with the ways how to fix it (re-format, replace the manufacturer of the card, too large, too small and etc.)

[SaroC]

This maybe could be useful to fix some issue. I flashed the initial fw into the DISCO and I have an error only when the sd card is inside. I tryed to format th 32GB card several time without results.