/lib/udev/rules.d/85-hdparm.rules is in hdparm 9.39-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | ACTION=="add", SUBSYSTEM=="block", KERNEL=="[sh]d[a-z]", RUN+="/etc/init.d/hdparm hotplug"
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