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Canon also recommend the refresh tool being used with SanDisk CFAST cards to avoid slow down of the performance. Lexar cards do not have this issue and can be just formatted in-camera
In addition, if an affected SanDisk CFast card has already been formatted with a computer or another device, please format the card again with a camera with the above step 1 applied.
About the "Refresh Tool" of SanDisk cards:
Q1: Whenever the camera is used to format a SanDisk CFast card, is it mandatory to use the refresh tool? If the refresh tool is not used, will the bottom part of still images become corrupted?
A1: The refresh tool is not related to image corruption that appears at the bottom part of still images. We are informing users about this tool as SanDisk recommends regular use of the refresh tool when using SanDisk CFast cards. For details about the use of the refresh tool, please inquire with SanDisk.
Q2: How often does the refresh tool have to be used?
A2: For details about use frequency, and the use of the refresh tool, please inquire with SanDisk.
Q3: What will happen to camera operations if I continue using a SanDisk CFast card without using the refresh tool?
A3: The speed for continuous data writing may decrease. If the data writing speed seems to have decreased during high-speed continuous shooting, please try to use the refresh tool to alleviate the problem. For any other technical questions concerning CFast cards, please inquire with SanDisk.
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