I wrote the sysutils/ataidle port back in the FreeBSD 5.x days, and since then FreeBSD has gained the same functionality in the camcontrol(8) program in the base system. Since I haven't maintained ataidle for a good few years, it should probably be deleted, and any remaining users directed towards the corresponding camcontrol commands.
A commit references this bug: Author: tobik Date: Fri Oct 12 13:41:44 UTC 2018 New revision: 481902 URL: https://svnweb.freebsd.org/changeset/ports/481902 Log: Deprecate sysutils/ataidle camcontrol(8) from the base system should be used instead. PR: 228578 Submitted by: bcran (ataidle developer) Approved by: wg (maintainer timeout, 4 months) Changes: head/sysutils/ataidle/Makefile