Vista software RAID1 - These drives compatible?

edited February 2007 in Hardware
I've been trying to software stripe these WD drives using windows vista disk management. It always stops with this error: The attempted operation is invalid. They are both on IDE channel 1.

The size, speed, seek/read/write, cache seem the same. Can anyone tell me if they are compatible with each other?

DiskWDC_WD400BB-00DEA0______________________05.03E05

DiskWDC_WD400BB-32CAA0______________________16.06V16

Process:
Delete partitions on both disks
Right-click Disk0
Click [New striped volume]
Click [Next]
Add Disk1
Click [Next]
Assign drive letter F
Click [Next]
Format NTFS, Default allocation unit size
Click [Next]
Click [Finish]
Click [Yes]
Disk Management
The attempted operation is invalid. Either the parameters specified are invalid or the operation cannot be completed on the selected object. Refer to the Disk Management help for assistance on the correct use of the attempted operation.
OK
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