cache manager async IO?

I have couple of questions on cache manager would be great if some can
respond or help.

  1. Obsered that Cache manager is sending synchronous IO to disk driver.
    Q: Is there anyway to make cache manager send asynchronous IO to the disk

  2. In our tests we found that NTFS and Windows 2000 cache manager is
    flushing data to our disk device synchronously in 64K chunks.
    Q: Is there any way to make the cache manager send a larger then 64K write
    to our device?

  3. Is there any way to disable cache manager on our volume/disk?