Why is Windows Server 2008 Disk Access Slower than Windows Server 2003?

Why is disk access on Windows Server 2008 3x slower than
Windows Server 2003? We are purchasing new hardware for our build servers and may end up
with a 6 year old OS because disk access is so slow with Windows Server 2008 and 2008R2.
I have performed benchmark tests on clean OS installs on the exact same hardware. The
benchmark consists simply of unzipping an 800MB zip file of source files. We use 64bit
7Zip to unzip. Uncompressed the source tree is approximately 3.9GB and consists of 43k
files. We then delete the tree via "RD /q
/s".

Benchmarks:


            Windows Server 2003 - 2:12
 Windows Server 2008 - 5:05
 Windows
            Server 2008 R2 -
            6:15

I have tried the
test with indexing disabled, but it did not help. Is there a configuration setting I
have missed?

Write caching is not enabled. My
device driver will not allow me to enable write caching. I get "The device does not
allow its write-caching setting to be
changed."

No shadows on the
system:

C:\>vssadmin
            list shadows
vssadmin 1.1 - Volume Shadow Copy Service administrative
            command-line tool
(C) Copyright 2001-2005 Microsoft
            Corp.

No items found that satisfy the
            query.

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