I wrote a disk filter driver which is working fine on
Windows 2000 and Windows XP. When I tested it on Windows
server 2003, it was not working. The problem is the
IRP_MJ_READ and IRP_MJ_WRITE message does not pass to the
driver.

I tested that with the sample program "diskperf" from the
Windows DDK, which has the same behavior on Windows
server 2003. Is that any special change on writing
filter driver for 2003 server.