It's likely that your SD card is either not compatible with tthe R-44, or your SD card may simply need to be formatted. You should save any necessary projects to your computer, then format the SD card in the R-44. If the problem persists, your SD card is likely incompatible or corrupt. Try another SD card. Here's a list of compatible SD cards: Toshiba SD-M32G 32GB Toshiba SD-M16G 16GB Toshiba SD-HC008GT4 8GB Kingston SD2/8GB 8GB Kingston SD2/4GB 4GB Kingston SD/2GB 2GB Kingston SD/2GB 2GB Kingston SD/1GB 1GB Panasonic RP-SDV32GU1K 32GB(6) Panasonic RP-SDV16GU1K 16GB Panasonic RP-SDV08GU1K 8GB Panasonic RP-SDV04GU1K 4GB Panasonic RP-SDV02GU1A 2GB Panasonic RP-SDR02GU1A 2GB Panasonic RP-SDQ02GU1A 2GB Panasonic RP-SDV01GU1A 1GB Panasonic RP-SDR01GU1A 1GB Panasonic RP-SDQ01GU1A 1GB Panasonic RP-SDR512U1A 512MB Sandisk SDSDRH-016G-A11 16GB SanDisk SDSDRH-8192-A11 8GB SanDisk SDSDBR-4096-A10 4GB SanDisk SDSDRH-4096-A10 4GB SanDisk SDSDRH-2048-A10 2GB SanDisk SDSDB-2048-A11 2GB SanDisk SDSDB-1024-A10 1GB SanDisk SDSDH-1024-A11 1GB SanDisk SDSDB-1024-A10 1GB SanDisk SDSDH-512-A10 512MB SanDisk SDSDH-512-A11 512MB SanDisk SDSDB-256-J60 256MB Lexar SD2GB-231, 2GB Lexar SD1GB-231, 1GB Lexar SD512-231, 512MB |