Hardisk ntfs back to raw format

hi all

how am i able to convert ntfs format back to raw format for my 3.5 inch 500gb hdisk
i tried using disk mgmt to delete the partition but it still shows basic instead of raw..

i cannot format because it will be ntfs or fat32 sys, i need it to be raw just like new to be fitted in a dvr sys.
the problem was caused when i formatted the hdisk in pc instead of the dvr

thnxs for the help

thnx for the reply

the dvr can format the hdisk, but after removing the hdisk from dvr to pc,
pc dont recognise the hdisk, no drive allocation to it, therefore files inside cant be read
by the pc? that why i used disk mgmt to assign a drive but it has to be formatted to ntfs.
the rest is history as now dvr cant recognise hdisk, need it to be raw again

now my dvr supplier claim he forgot to gave me the software for the dvr to read the files
in hdisk from pc. i think the files are in mcg , not common like avi or mpg