I am dual booting my system with Ubuntu 12.04 and Windows 7. I have created the special swap partition for Ubuntu while installing (as recommended).
Can Windows use this swap area/partition--as its own swap/page file--when I boot from Windows?
It's possible, but probably only as an experiment:
Alternative (still not recommended) option:
You can create a swap file by following this guide on the NTFS partition, provided the NTFS partition is large enough for both swap files.
However this alternative is not recommended because:
If your goal is to save hard drive space -- not having to waste many GBs for both Linux's swap and Windows's pagefile, then you might consider using dynamic swapfile size on linux via SwapSpace:
It works great.
Whats needed? Just follow the instruction in the SwapFs-3.0 file.
Also you could find some helpful stuff at How To use Linux Swap Partition as Windows Swap file on Ubuntuforums.org.
At first I tried to format swap space into NTFS but turned out that Linux lost ability to recognize it as an own created.
Then I reformatted it back to classical Linux swap.
Next I changed back fstab. Was:
Deactivated that and put instead:
If I remember well, after I booted into Windows it didn't recognized it as RAW or if I could have formatted it as FAT32.
And everything started working.
But a problem appear. Namely my Vista 'attached' an additional letter, thus at last had two drivers but in fact linked with the same partition 'e:\' and established by me as 's:\'.
Fortunately it was enough to get to the registry to place recommended in *.reg file, from 'SwapFs-3.0'. Turned out that the extra additional record 'e:\' should be removed from registry.
Right now enjoying inter-system swap space without problems. Recovered 3.2 GB space.
I would like to mention that using Linux just 4 three months and be able to do such complicated operations, thus you could do this without any enormous effort.
I haven't tried it myself but you can mount a swap partition with swapfs. You can then, in theory, place your pagefile there (there's some good reasons not to, such as minidumps, but its an option).
The short answer is: No, it cannot.
Windows does not recognize Linux partitions, although the opposite is possible (linux recongnizes windows partitions).