Having just driven on a major road that my 2018 Octavia satnav didn't know about, i decided it's time to update my (Amundsen) maps. Got as far as https://updateportal.skoda-auto.com/ and it all looks pretty straightforward, but the downloaded map update (ECE 1 2022) is only 6.7Gb, whereas the current SD card contents take up 12.9Gb . The difference seems almost entirely attributable to files in the folder maps/00/nds/PRODUCT; the update has subfolders E1, E2, E3, and E12, while the original additionally has E4, 5, 6, 8, 10, 11, and 13.
I hesitate to risk trashing my system by reformatting the card until i understand what these differences are down to -- anyone know? The card's labelled "Europe 1"; the only substantially larger map on the update portal is the all-Europe ECE A1 2022, which requires a 32Gb card (mine's a 16Gb)