Filtering disk IO when Windows hibernates
- From: ser-news@xxxxxxxxxxxx
- Date: 23 Dec 2005 02:11:47 -0800
Dear gurus,
Could you advise how disk IO requests Windows 2000/XP sends during
hibernate (or
crash file dump) process can be filtered?
In more detail, the problem is in the following. We work on software
that transparently
encrypts sectors on physical disks. My disk IO filtering driver works
fine except the moment
when Windows hibernates or writes crash dump file to disk. At that
moment Windows does
not use a regular well-documented stack of layered disk drivers.
Instead, the operating system
calls disk miniport driver directly. (Probably it would be more
correctly to say - after sending IOCTL_SCSI_GET_DUMP_POINTERS Windows
loads a separate copy of the driver and uses
it for writing sectors.)
As a result, our filtering driver cannot filter and encrypt the sectors
Windows writes during the
hibernation process.
If someone knows how to filter these disk IO requests, the advice
would be greately appreciated.
Best regards,
Sergey
(I've read several topics on the matter in newsgroups, but could not
find some concrete answer.
As MSDN subscribers probably we should contact Microsoft, but is it
really necessary and may
help?)
.
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