SD CARD COMPATIBILITY LIST FOR SR-20HD SD memory cards that have been verified to work with SR-20HD are the following. SanDisk SDSDUN4-256G SanDisk SDSDUN4-128G SanDisk SDSDUN4-64G SAMSUNG MB-SC256H SAMSUNG MB-SC128H SAMSUNG MB-SC64H Important Notes For other SD memory cards, we recommend using an SDXC card whose capacity is 64 GB or larger. Before actual use, carry out a speed test on the SR-20HD, and use a card whose speed is 20 MB/s or higher. Operation using a microSD card is not supported. When using an SD memory card, be sure to format it on the SR-20HD. SD memory cards formatted on devices other than the SR-20HD might fail to function correctly. We recommend backing up SD memory cards to a computer to safeguard against accidents. Please refer to the Owner's Manual about insert or eject an SD memory card.