19
 1 Insufficient memory, please consult your documentation
 2 Illegible disk label
 3 Disk label does not correspond
 4 Insert disk
 5  in disk drive
 6 File not found
 7 Disk drive not recognized
 8 Disk drive not responding 
 9 Disk type not recognized
10 Severe error on disk drive
11 Access error on disk drive
12 Disk is write protected
13 Invalid disk access
14 Write error on disk
15 Read error on disk
16 Unrecognized error on disk drive
17 Directory not found
18 System error
19 Logic error
