Support for Secure Erase: Inconsistencies with Older WD Drives?

hai community,
While attempting a Secure Erase using hdparm on my WD10EADS drive from 2009, I realized it doesn’t seem to support this feature. Strangely, another drive I purchased around the same time, the WD100FALS, does. I was under the impression that Secure Erase was a basic feature on drives since 2001. Is anyone else facing similar inconsistencies with older WD drives? I’m resorting to manual wiping, but I’m curious to hear your insights!
Thank you in advance,
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Kirra Eva.