Create a file of any size....

• You can create a file of any size using nothing more than what's supplied 
with Windows. Start by converting the desired file size into hexadecimal 
notation. You can use the Windows Calculator in Scientific mode do to this. 
Suppose you want a file of 1 million bytes. Enter 1000000 in the calculator 
and click on the Hex option to convert it (1 million in hex is F4240.) Pad 
the result with zeroes at the left until the file size reaches eight 
digits 000F4240. 

Now open a command prompt window. In Windows 95, 98, or 
Me, you can do this by entering COMMAND in the Start menu's Run dialog; in 
Windows NT 4.0, 2000, or XP enter CMD instead. Enter the command DEBUG 
BIGFILE.DAT and ignore the File not found message. Type RCX and press 
Enter. Debug will display a colon prompt. Enter the last four digits of the 
hexadecimal number you calculated (4240, in our example). Type RBX and 
press Enter, then enter the first four digits of the hexadecimal size 
(000F, in our example). Enter W for Write and Q for Quit. You've just 
created a 1-million-byte file using Debug. Of course you can create a file 
of any desired size using the same technique...