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Does dd if=/dev/zero of =/dev/cciss/c0d0 bs=1M wipe over the HPA, DCO, and any bad sectors?

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    No. The whole point of the HPA is that it makes sectors inaccessible. Likewise the DCO is not accessible either, nor are sectors that have been remapped. – psusi Feb 22 '18 at 19:13
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DD cannot erase the HPA or remapped sectors as it can't see them. ATA's secure erase command should do this, but there is no way to truly verify that it has been done.

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