21. Your external storage device is not formatted. 22. But with external support based on a personalized curriculum. 23. Draught-proofing of external doors or windows; 24. Unable to launch external application. 25. Draught-proofing of external doors or windows ; 26. Sorry, your external storage device is not supported at this time. 27. Use an external .md5 file that stores the checksum of a disc 28. Disable mounting of external storage 29. You don't have the needed external application to handle it. 30. Don't use an external application to view page source.
