Yeah in Diskpart I typed it in. For a 256 sector offset you need to type 128 because KB is used as unit instead of the number of sectors.
In my example it would be:
131072 Bytes / 512 = 256 sectors
256 sectors * .5 / 128 = 1
You can find more detailed info regarding the calculations here: http://support.microsoft.com/kb/929491
Bookmarks