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It's the search indexer or the music service.
I use a Synology NAS and had this problem a very long time ago. I slowly disabled everything until eventually I got it to the point that the only thing running was the file manager and file network shares.
There is a load of things installed by default which you don't need... disable and delete things.
Also... https://synocommunity.com/package/synocli-monitor will do what you want. Install and enable SSH and then use standard Linux tools to see what is happening.
Anyone use a Synology NAS and know if it's possible to find out which process(es) are accessing the HDD?
Mine's thrashing constantly and I can't figure out why. DS216+II if that's of any relevance.