After eliminating swap my /dev/sdb still spins up about once an hour.

I don't have any of the following installed:
- hddtemp
- sensors-applet
- smartmontools

In "cat /proc/mounts" I don't see any references to /dev/hdb or UUIDs of
any of its partitions.

I tried monitoring disk access and got no indication of any process accessing 
/dev/sdb* when the disk spun up or at any other time. I used this script to 
monitor:
    echo 1 >/proc/sys/vm/block_dump
    while ( ! dmesg -c|grep sdb ); do sleep 1; done
    echo 0 >/proc/sys/vm/block_dump

Is there any way I could "freeze" the kernel after issuing the hdparm
-S/y/Y command so that I can be sure neither the kernel nor any process
is able to access the disk? That way I could make sure it's not the disk
itself or the controller which decides to spin up the disk.

-- 
Hard drive will not stay in standby mode
https://bugs.launchpad.net/bugs/180986
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