|During Windows XP installation, you can choose to format the harddrive, before continuing the installation.|
The more interesting question is, how will you get Windows XP installed, if there is no CDROM drive in the system?
You can simply mount another harddrive, connect it to the motherboard, connect the power cable for the harddrive and maybe enter the BIOS, to see, whether the newly mounted harddrive is recognized.
If you connect the second harddrive to the same IDE cable, make sure, the jumpers of the harddrives are properly set to master and slave mode.
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