Formatting

• Drive is not formatted, would you like to format now
• Formatted drive/card by mistake
• Not formatted error
• Cannot format card/drive/disk

RAW file system

• drive/card became RAW file system which was FAT32/NTFS
• CHKDSK error message - "The type of the filesystem is RAW"
• 0 byte in size in the raw drive Properties
• chkdsk is not available for raw drives

Accidental deleting

• 'Shift + Del' and lost data
• Deleting files by right- clicking menu or just pressing 'Delete' button and some important files are gone too
• Emptying Recycle Bin without backup
• Deleted partition by accident

Improper operation

• Pressed Factory resetting by accident and lost data
• Pulling out memory card while it is still working in the camera ie not safe removal
• Memory card became unreadable by camera or PC
• Unplug the memory card/usb while it is still woring on PC

Other reasons

• Virus infection - you use your data/partition without notice
• Power surges
• Formatting a wrong partition
• Ghost a wrong disk drive
• Damaged partition table or MBR
• File lost without a reason