help needed with partitions

We are creating SMS osd installation CD.

We modified the diskpart.txt file in the package & deifne the partitions size in the file. It works fine when we are using fresh / unpartitioned harddisk.

When we use an old harddisk where partitions are already defined then diskpart.txt settings not worked.

I also modified the winbom.ini file in the installation CD to wipe-off the existing partitions, but it does'nt works too.

My question : How to wipe off all the partition in an old hdd using SMS osd CD. and make new primary partition of 30 gb

the os i am going to deploy is windows xp and vista...please tell me what shud be editited in winbom.ini and diskpart.txt in iso so as to achieve the goal

Regards

suhail

****winbom.ini*****

[Factory]

WinBOMType=WinPE

Reseal=No

[WinPE]

Quiet=Yes

Restart=No

[PnPDriverUpdate]

[PnPDrivers]

[NetCards]

NICPnPID="%SystemRoot%\INF\e1e6032.inf"

NICPnPID="%SystemRoot%\INF\e1e5132.inf"

NICPnPID="%SystemRoot%\INF\e1000325.inf"

NICPnPID="%SystemRoot%\INF\e1e5032.inf"

[DiskConfig]

Disk0=Disk1.Config

[Disk1.Config]

WipeDisk=Yes

Size1=30000

FileSystem1=NTFS

SetActive1=Yes

PartitionType1=Primary

[updateInis]

[FactoryRunOnce]

[branding]

[AppPreInstall]

************end******************