CUSTOM PATTERN MAKER - Chapter IV - pg 27
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  the .bak version of the file to .dwg. This way you will only have to start over from the point you were at when you last saved your drawing. (See your Windows Help files for how to rename a file.)

18.5.  Surprising things happen to computers and "floppy disks".  Wise computer users SAVE everything on two separate "floppy disks", therefore having a "back up disk".  While "floppy disks" are fairly durable, they sometimes get electronically damaged and also get lost.

18.6.  BE SURE TO LABEL YOUR DISKS WITH YOUR NAME AND THE NAMES OF THE FILES and THE DATE THE FILE(S) WAS CREATED ON. As time passes and your archive of pattern on disks grows this will be an essential tool in being able to find and retrieve a pattern quickly when needed.
                            
18.7.  MEMORIZE AND PRACTICE THIS CONCEPT:  At the end of each working session always make copies of your pattern files on two separate floppy disks.

18.7.1.  The electronic codes on the disks can easily be "corrupted" by specks of dirt or wetness.  Be sure to carry them in closed, water proof containers.  Do not flip the metal guard on the disks open and shut.  Even a finger print could mess it up. An ideal container would be a mylar ziplock bag.

18.7.2. As a general rule metal scanners at airports, schools, etc. will not corrupt a floppy disk.


IMPORTANT:  DO NOT EVER LAY YOUR FLOPPY DISKS ON TOP OF ANY OF THE WORKING PARTS OF THE COMPUTER.  THIS IS ONE OF THE MOST COMMON WAYS THEY BECOME ELECTRONICALLY DAMAGED.

BE CAREFUL - DO NOT REMOVE A FLOPPY DISK FROM THE COMPUTER WHILE THE LIGHT IS  ON INDICATING THAT THE COMPUTER IS WORKING ON IT.  THIS MAY CAUSE IRREPARABLE DAMAGE TO THE FLOPPY DISK AND THE DISK DRIVE MECHANISM.    

19.  CONVENTIONS FOR NAMING FILES.   Currently, although WINDOWS will display file names with more than 8 integers as long as they are created in and displayed in the same machine, it will truncate files that are copied from another disk or computer. For this reason it is wise to stick to naming your drawing files with only 8 integers plus the required .dwg suffix (file type “tag”).
    
    You can use any combination of numbers and letters in you name, but you cannot depend on upper and lower case differentiation in you naming. Do not use spaces in your names.  If you want a space use the underscore “ _” (example: bod_frnt.dwg) or a hyphen “-“ (example: bod-bksd.dwg).