• Unsupported features
• Hot plug/unplug
• File ownership and umask
• Permission bit mappings
• User read permission
• User write permission
• User execute permission
• Group and other permissions
• File times
• Unusual behaviours
• Unreadable files or directories
• Unexpected failure to remove read-only files
• Inability to remove open files
• Disallowed Windows characters or reserved names
• Filenames differing only in case