unattended setup - "ntoskrnl.exe damaged or not found"

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I use a network based unattended setup for my Windows 2003-Servers (HP DL360
G4 with smart array 6i). In the setup I have integrated the mass storage
drivers for the smart array 6i.

I do the following: DOS boot, make a partition with 2GB, format with FAT,
connect the distribution share, run winnt.exe with /u:unattend.txt. Setup
starts and copies the files. Then it reboots and I get the error
"ntoskrnl.exe damaged or not found".

But when I look on the harddisk, all files are there! The strange thing is:
When I now start the setup a second time (incl. formatting the harddisk),
everything works fine!

Does anybody have an explanation for this phenomena?