this post was submitted on 27 Nov 2023
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We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
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DM-SMR is Drive Managed-SMR. All the write/read activity is handled by the onboard electronics.
HM-SMR is Host Managed-SMR. All write/read activity is handled by specialized external hardware and software. They're far from the capabilities of most home users today.
The current 26TB WD Ultrastar and upcoming 28TB WD drives are HM-SMR. The upcoming 30TB Seagate is also HM-SMR.
https://www.reddit.com/r/DataHoarder/comments/13z7w96/lets_discuss_dmsmr_hmsmr_hasmr_and_dropbox/
https://www.reddit.com/r/DataHoarder/comments/146hb9k/information_about_cmr_to_smr_manufacturer/
Your MaxDigitalData (MDD) drive is likely CMR because they're almost surely used enterprise drives. However, be careful as there was a user whose drive was HM-SMR and unusable.
MDD is a division of GoHardDrive and IMO, are drives that GoHardDrive doesn't want to sell under their own name. Also Avolusion (externals) is a division of GoHardDrive and has been reported to contain used drives.