The following article troubleshoots in the event that a "File System Error" message appears on the R-26.
- Format the memory card: R-26: Formatting the SD Memory Card
- Be sure that the card meets the compatibility requirements: R-26: SD Card Compatibility Guide
- If a power supply is being used, be sure that a Roland PSB-100/120/230/240 (PSB-1U + AC cord) is being used only--3rd party power supplies can cause the unit to not operate properly.
- If batteries are being used, test with brand new, never before used batteries. Alkaline batteries are recommended while testing.
- Be sure that the batteries are compatible: R-26: Battery Compatibility Information
- If the problem continues with a compatible memory card, test with a different compatible memory card. These can be purchased online (e.g. Google Shopping) or from a local electronic/computer store.