HPA & DCO does not exist on nvme drives. Forensics.

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Standard forensic acquisition processes include checking for the existence of an
HPA and DCO. These do not exist on NVME drives and can be ignored, but
a check for the existence of multiple namespaces should be performed. Namespaces are not like DCO and HPA, and should not be ”removed”. Attempting
to remove a namespace may irrevocably destroy evidence on the NVME drive.
Consumer NVME devices on the market today typically only support a single
namespace. During the writing of this papers, no devices were tested that
support the creation of multiple namespaces4
.
The number of namespaces supported and used can be checked by sending an
identify controller admin command. In the following example, various information about namespace support is shown:

Some interesting bedtime reading. If that is generally true that HPA & DCO doesn't exist on NVME drives makes my job a little easier in just checking on the older drives.

Here's the full document. nikkel16_nvme_drives.pdf