wd external low level format problems

[Beans on toast Dave]

i wanted to erase all info from these drives for sale
i used acronis secure erase via a boot cd rom
i started to erase the first drive and at some it stopped so i removed it and took it to format on another pc, it could not be initalized in windows
i then tried a tool from wd which zeros the drives and that was producing write errors, so i removed the drive from the housing and tried to format it in my pc
now the pc wont detect it at all

not really sure what to do now, i seem to be stuck with 2 dead drives that had no problems before using acronis


any ideas before i burn them

 

[Beans on toast Dave]

for those who might have been intrested, fixed by wiping the drives with parted magic