Page size and recoverability

Hello!
The document at http://www.oracle.com/technology/documentation/berkeley-db/xml/programmer_reference/transapp_reclimit.html has a statement that for better recoverability, page size should be equal to OS I/O size (this makes sense, reasons are clearly described in the document).
The default page size on Windows is 8KiB. I am not sure, but I think that Windows I/O size might be as low as sector size (512 bytes on most disks).
I would like to hear an expert's opinion on this matter:
1. should I care about page size being larger than OS I/O size in transactional apps?
2. why default page size on Windows is 8KiB?
3. what I/O size is atomic on Windows (with and without OS write caching, only NTFS matters)
4. if I'm correct and Windows does only small I/Os atomically, what steps should be taken to minimize the potential data loss
5. hot backup also relies on atomic copies -- do the questions raised above affect backup recoverability (both data and logs)?
Thank you for your attention.

Hello,
A similar question is raised in:
Why is the default page size on Windows 8K?
As explained there, we choose an 8K default on all platforms where we cannot find an accurate block size. This is because it is generally better - for performance reasons - to write data in chunks larger than the block size. You can turn on checksums to ensure that any page file transfer problem is detected.
Thanks,
Sandra

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