> A ten ramdysk to na pewno bedzie sie chcial utworzyc w tej niewidocznej dla
> systemu czesci pamieci...?

Otóż właśnie tak! I to jest piękne!
Tu jest fragment z manuala:

You will only see the Advanced tab if


(a) you are running a 32-bit version of the Windows OS that is limited to 4GB of
system memory,


(b) your system has more than 4GB of physical memory installed and


(c) your system has Physical Address Extensions enabled and


(d) the BIOS on your system supports the Windows Management Instrumentation
calls that allow Windows to enumerate the physical memory installed on your
system.


The latter is true of most modern hardware. Specifically, it requires the use of
the Window Hardware Abstraction Layer (HAL) "Halaacpi.dll", which is the Windows
ACPI HAL with IO APIC support. Vendor specific HALs are not supported. In
addition, the system BIOS must make the necessary information about the
installed system memory available for the CIM_PhysicalMemory class to be
created.

Ordinarily RAMDisk requests disk memory from the operating system, much like any
other program. This tab can enable a feature of RAMDisk that will allow you to
utilize unused memory above the 4GB limit for 32-bit versions of Windows, memory
that is not being used by the operating system but is available to your
hardware. This feature is not available for 64-bit versions of Windows because
they do not have a 4GB memory limitation. Please not that some versions of
Windows (for example, Windows 2003 or 2008 Server Enterprise) support the use of
Physics Address Extensions in the kernel and the Windows kernel can access
memory above 4GB. You will not see the Advanced Tab when using RAMDisk under
these operating systems because RAMDisk can access all system memory normally
through the Windows kernel. The use of memory above the 4GB barrier is supported
under 32-bit versions of Windows XP, Windows 2003 Standard Server, Windows
Vista, and Windows 7.

The Advanced tab shows you how much memory RAMDisk has detected above the 4GB
limit which is unused by 32-bit Windows. With RAMDisk you can use this memory
instead of Windows system memory, making optimal use of all the memory available
to your system. The Advanced tab will show you how much physical memory is
available, how much is used by Windows and your system hardware, and how much is
potentially available to RAMDisk.