I second shred. Only issue is that if drive is ssd chances are you
will not overwrite every sector.

Todd, I do not know how old those iMacs are, but some (lampshade) had
the drives on the base while others have it behind the motherboard
behind the monitor. And some also had the drive soldered to the
motherboard.

On Tue, Nov 1, 2022 at 9:04 PM Go Canes <[email protected]> wrote:
>
> When using dd for copying or erasing disks, I typically use bs=1M.
>
> For erasing disks I prefer to use the shred utility - multiple passes
> with various patterns and it displays progress.
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