32-bit Windows operating systems have a maximum of 4 Gb of virtual address space. By default, 2Gb is reserved for the operating system and 2 Gb is reserved for applications. However, you may find that this is not sufficient if you are attempting to view extremely large studies using eFilm. This article describes how to change the distribution of address space so that 3 Gb is available for use by applications.

Caution: Reducing the amount of address space available to the operating system may impair the performance of your computer. You have been warned.

System Requirements:

• eFilm 2.1.2 or later
• Windows XP Professional
• 3 Gb RAM (minimum)

To increase the available address space for eFilm:

1. Locate the BOOT.INI file in the root folder of your C:\ drive.
2. Double-click the file to open it in Notepad.
3. You should see text that looks like the following. Your file may vary slightly depending on the operating system you are using:
   
   [boot loader]
   timeout=30
   default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
   [operating systems]
   multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn
   
4. After the last switch on the last line, add "/3GB," so that the revised line looks like:
   
   multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn /3GB
   
   Note: The settings shown in the example will vary by machine. It is not necessary to make your boot.ini file look just like the example; all you need to do is add the '/3GB' switch.
   
5. Save your changes and reboot. eFilm will not be able to use the larger address space.