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Cyclic redundancy has nothing to do with calibre AFAIK. It is an IOS error.
Usually a disk error caused by bad spot on disk. Electrical shock or scratches on media or removing media before file writing is complete.
Try removing card, reboot computer and try the card again.
BTW it is your OS wanting to reformat the disk because it could not read the system files to write a file. Nothing was deleted the card was not readable so calibre could not write anything or delete anything.
Helen
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