x64 Vista SP1 corrupts large NTFS disk volumes

ISSUE AFFECTS ONLY x64 EDITIONS OF WINDOWS VISTA SP1 OR WINDOWS
SERVER 2008.

I'm seeing corruption of my NTFS file system when using or installing
upon large partitions using x64 Vista SP1 (or x64 Windows Server 2008
SP1, same behavior). Repair (CHKDSK) of the volumes does not work,
unless I boot to an x86 edition O/S like Windows Server 2003 SP2 or
Windows XP SP3.

Anyone else see this behavior, or know why I'm experiencing this headache?

-----------------------------------

Layout of my paritions as follows:

Disk 0 - ICH9R (RAID10) VOL0
- Volume 0 - Primary Partition (active) 40GB, system partition
- Extended Logical Partition (none)
Disk 1 - ICH9R (RAID10) VOL1
- Primary Partition (active) 40GB (x64 Windows Server 2008)
- Primary Partition 40GB (x86 Windows Server 2003 SP2)
- Primary Partition 813GB (x64 Windows Vista SP1)
- Extended Logical Partition (none)
Disk 2 - JMB363 (RAID mode, SATA, AHCI, non-RAID config)
- Primary Partition (active) 40GB (x64 Windows Server 2003 SP2)
- Primary Partition 40GB (x64 Windows Vista SP1)
- Extended Logical Partition (none)
Disk 3 - JMB363 (RAID mode, SATA, AHCI, non-RAID config)
- Primary Partition (active) 698GB
- Extended Logical Partition (none)

Volumes susceptible to corruption: the 813GB and 698GB volumes

All HDDs SATA
DVD on JMB363 PATA port

ICH9R RAID status is normal (healthy mode, not degraded)
JMB363 RAID capable, but only AHCI features used

Microsoft driver for ICH9R controller (iaStorV.sys, 6.2.0.1019)
JMicron driver for JMB363 controller (Jraid.sys, 1.17.38.5)

-----------------------------------

OS: WinXP SP3 x86, Win2003 SP2 x64 & x86, Win2008 x64, Vista x64 SP1
CPU: Intel Q6600 Quad Core
Video: ATI HD 3450 PCIe with 512MB, with latest ATI Catalyst Drivers.
NIC: Marvell 88E8052 Gigabyte LAN PCIe
Mobo: DFI LP UT P35-T2R
Mem: 8GB (4x2GB Patriot Viper PC2-8500, 5-5-5-15)
Disks: 5 x WD 5001ABYS Caviar RE2, 500 GB each;
....and Samsung Spinpoint F1 HD753LJ, 750GB (external enclosure, eSATA)
Raid: ICH9R 4xHDD RAID10 = 1TB
Other HDD: non-RAID config on JMicron SATA (running in RAID+IDE mode)
DVD: HP DVD Writer 1040r (IDE)