For archival storage with a relatively low I/O load, low power drives make a lot of sense. But be aware that many of these drives will spin down after a short period of inactivity - this can lead to a multi-second delay while waiting for the drive to spin up again on the first access to data. It's not a problem as long as people know that it may occur and understand that it's not a cause for concern.
after reading some more seem like green is the better choice and will prolong the life of the hdd. the only time i need performance is when i am transferring data onto the server.
Green drives are still fast (~100MB/s) when transferring large files sequentially, like when doing backups etc. They may also be more reliable due to less heat production and lower friction.
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