Does anyone know of any winxp apps or commands that can write zero's to all
unused blocks/bits of an ntfs partition? We are creating bit level images
for 'ghosting' to a bunch of identical machines. Compressed, the images are
only moderately smaller than the full size of the drive. If we can write
zero's to all unused areas of the disk/partition - the disk images should be
greatly compressible.

We are looking for a cheap/free solution but on the other hand are greatly
restricted in what 'unapproved' third party software (i.e general freeware)
we are allowed to use. Something provided by microsoft would be ideal.

Any suggestions or pointers would be greatly appreciated.

Thanks.