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This switch forces x86-based


For example, type /burnmemory= 128 to reduce the physical memory that is available to Windows by 128 MB.

/3GB

This switch forces x86-based systems to allocate 3 GB of virtual address space to programs and 1 GB to the kernel and to executive components. A program must be designed to take advantage of the additional memory address space. With this switch, user mode programs can access 3 GB of memory instead of the usual 2 GB that Windows allocates to user mode programs. The switch moves the starting point of kernel memory to 3 GB. Some configurations of Microsoft Exchange Server 2003 and Microsoft Windows Server 2003 may require this switch.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

823440 You must use the /3GB switch when you install Exchange Server 2003 on a Windows Server 2003-based system

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

171793 Information on application use of 4GT RAM tuning

/safeboot:parameter

This switch causes Windows to start in Safe Mode. This switch uses the following parameters:


  • minimal
  • network
  • safeboot:minimal(alternateshell)
You can combine other Boot.ini parameters with /safeboot:parameter. The following examples illustrate the parameters that are in effect when you select a Safe Mode option from the startup recovery menu.


  • Safe Mode with Networking
    /safeboot:minimal /sos /bootlog /noguiboot
  • Safe Mode with Networking
    /safeboot:network /sos /bootlog /noguiboot
  • Safe Mode with Command Prompt
    /safeboot:minimal(alternateshell) /sos /bootlog /noguiboot
Note The /sos, /bootlog, and /noguiboot switches are not required with any one of these settings, but the switches can help with troubleshooting. These switches are included if you press F8 and then select one of the modes.

/userva

Use this switch to customize the amount of memory that is allocated to processes when you use the /3GB switch. This switch permits more page table entry (PTE) kernel memory but still maintains almost 3 GB of process memory space.

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