http://www.tomshardware.com/reviews/windowsxp-make-raid-5-happen,925.html

Limbering up WindowsXP in order to run RAID 5 requires a hex editor (e.g. Ultra Edit) as well as your WindowsXP CD. First of all we need to copy some files into a temporary folder:

C:\windows\system32\drivers\dmboot.sys


C:\windows\system32\dmconfig.dll 
C:\windows\system32\Dmadmin.exe

Next, these files need to be opened using your hex editor:

dmboot.sys:
Before: 
0000f1f0h: 74 00 54 00 79 00 70 00 65 00 00 00 57 49 4E 4E ; t.T.y.p.e...WINN 
0000f200h: 54 00 00 00 53 45 52 56 45 52 4E 54 00 00 00 00 ; T...SERVERNT....
After: 
0000f1f0h: 74 00 54 00 79 00 70 00 65 00 00 00 53 45 52 56 ; t.T.y.p.e...SERV 
0000f200h: 45 52 4E 54 57 49 4E 4E 54 00 00 00 00 00 00 00 ; ERNTWINNT.......

dmconfig.dll:
Before 
00005140h: 4C 41 4E 4D 41 4E 4E 54 00 00 00 00 53 45 52 56 ; LANMANNT....SERV 
00005150h: 45 52 4E 54 00 00 00 00 57 49 4E 4E 54 00 00 00 ; ERNT....WINNT...
After 
00005140h: 4C 41 4E 4D 41 4E 4E 54 00 00 00 00 57 49 4E 4E ; LANMANNT....WINN 
00005150h: 54 00 00 00 00 00 00 00 53 45 52 56 45 52 4E 54 ; T.......SERVERNT

dmadmin.exe:
Before 
00001c30h: 73 65 72 76 65 72 6E 74 00 00 00 00 6C 61 6E 6D ; servernt....lanm 
00001c40h: 61 6E 6E 74 00 00 00 00 50 72 6F 64 75 63 74 54 ; annt....ProductT
After 
00001c30h: 77 69 6E 6E 74 00 00 00 00 00 00 00 6C 61 6E 6D ; winnt.......lanm 
00001c40h: 61 6E 6E 74 00 00 00 00 50 72 6F 64 75 63 74 54 ; annt....ProductT

The original files in Windows' System32 directory need to be replaced by our modified versions now. However, simply exchanging the files by overwriting them will cause Windows to take notice, which eventually causes Windows to restore its original files by using backup files.

If your system drive is running FAT32, simply go ahead and boot any DOS operating system in order to overwrite the files manually. Since FAT32 does not cater for security at all, we do not recommend using this file system.

In an NTFS environment you will have to boot from the WindowsXP CD and launch the recovery console. This can be achieved by pressing 'R' in the first selection screen. At this point, you should have copied the modified files onto a floppy disk.

Let's go into the Windows directory first:

C: [ENTER]


cd\windows [ENTER]

Now, copy the files one by one by using the following commands. All files are located in two different directories each!

copy a:\dmboot.sys system32\drivers


copy a:\dmboot.sys system32\dllcache 
copy a:\dmconfig.dll system32 
copy a:\dmconfig.dll system32\dllcache 
copy a:\dmadmin.exe system32 
copy a:\dmadmin.exe system32\dllcache