Prevent spin-up of USB HD after upgrading to FreeBSD 15

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From: Martin <iio7_at_protonmail.com>
Date: Mon, 15 Dec 2025 01:07:01 UTC

I have an external Toshiba USB drive that automatically spins down
after about 1 minute of idle. After upgrading to FreeBSD 15, the drive
keeps spinning up again about every 5 minutes even though it is not being
used and isn't mounted. This didn't happen in FreeBSD 14.3.

The drive is running ZFS.

I have monitored both /var/log/messages and daemon.log using tail to
see if anything happens, but nothing goes on in those logs when it
happens.

How do I track down what's spinning up my drive?