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The SD cards can be ordered as spare part under the part number: 55536 "SD-Card 256 MB for flash 5xx and screen 400".
The cards can be formatted in Windows using the FAT16 or FAT32 format.
Footnote: custo med supplies industrial cards that are selected on low power consumption and no bad sectors, we advise to use these. In case a customer would like to buy and user their own SD cards it is at their own risk. The card however shouldn't be larger as 2Gb.