I've had a Special Issuance for sleep apnea for several years. Every year, the FAA has asked for a full year's worth of data from the memory card in the CPAP machine. Last month, I started seeing a SD Card Error message on my machine. Getting a new memory card resolved the fault message. I have no idea if the data on the faulted card, that has been in the machine since last January will be readable or not. Anyone been through this before? Any recommendations?