Three Pro Pioneer fans

Reading the Pro Pioneer User's Manual for the first time today, I was surprised to see three fans -- CPU, System, and Disk -- shown in the product illustrations. Surprised, because Frontview only shows two: CPU and SYS.

So I looked back there with a flashlight, and sure enough, I have three fans. I guess the power-supply fan is the "Disk" fan referred to in the manual.

The OS apparently knows about all three. Contents of /ramfs/enclosure.cfg, showing "SYS", "CPU", and "CAS" fans:

fan!!0!!desc=SYS,selfcontrolled=0,minrpm=900,required=1,alternate=2,path=/sys/class/hwmon/hwmon2/device/fan1_input,in_path=/sys/class/hwmon/hwmon2/device/pwm1
fan!!1!!desc=CPU,selfcontrolled=1,minrpm=150,required=1,alternate=1,path=/sys/class/hwmon/hwmon2/device/fan2_input,in_path=/sys/class/hwmon/hwmon2/device/pwm2
fan!!2!!desc=CAS,selfcontrolled=0,minrpm=900,required=0,alternate=2,path=/sys/class/hwmon/hwmon2/device/fan3_input,in_path=/sys/class/hwmon/hwmon2/device/pwm3
fan!!3!!desc=,selfcontrolled=0,minrpm=0,required=0,alternate=3,path=,in_path=
fan!!4!!desc=,selfcontrolled=0,minrpm=0,required=0,alternate=4,path=,in_path=
temp!!0!!desc=SYS,mintemp=0,maxtemp=65,divider=1000,path=/sys/class/hwmon/hwmon2/device/temp1_input
temp!!1!!desc=CPU,mintemp=0,maxtemp=60,divider=1000,path=/sys/class/hwmon/hwmon2/device/temp2_input
temp!!2!!desc=AUX,mintemp=0,maxtemp=0,divider=1000,path=/sys/class/hwmon/hwmon2/device/temp3_input
vol!!0!!desc=VCOR,minvol=0,maxvol=0,divider=1000,path=/sys/class/hwmon/hwmon2/device/in0_input
vol!!1!!desc=DDB18,minvol=1.7,maxvol=1.89,divider=1000,path=/sys/class/hwmon/hwmon2/device/in1_input
vol!!2!!desc=AVCC,minvol=3.12,maxvol=3.47,divider=1000,path=/sys/class/hwmon/hwmon2/device/in2_input
vol!!3!!desc=VCC3,minvol=2.96,maxvol=3.63,divider=1000,path=/sys/class/hwmon/hwmon2/device/in3_input
vol!!4!!desc=VCC1_25,minvol=1.17,maxvol=1.32,divider=1000,path=/sys/class/hwmon/hwmon2/device/in4_input
vol!!5!!desc=VCC1_5,minvol=1.41,maxvol=1.58,divider=1000,path=/sys/class/hwmon/hwmon2/device/in5_input
vol!!6!!desc=VCC1_05,minvol=0.98,maxvol=1.1,divider=1000,path=/sys/class/hwmon/hwmon2/device/in6_input
vol!!7!!desc=3VDUAL,minvol=3.12,maxvol=3.47,divider=1000,path=/sys/class/hwmon/hwmon2/device/in7_input
vol!!8!!desc=VBAT,minvol=2.96,maxvol=3.63,divider=1000,path=/sys/class/hwmon/hwmon2/device/in8_input
vol!!9!!desc=,minvol=0,maxvol=0,divider=1000,path=

Now I have questions:

1. Can I get all three fan speeds to show up in Frontview? From the limited information I was able to find here on the forum, it appears that all three fan speeds are only displayed when the NAS is misconfigured somehow... But that can't be right, can it?

2. In enclosure.cfg, "minrpm" is set to 900 for the SYS fan, but Frontview is currently showing the SYS fan's speed at 839 RPM with no complaints. What does "minrpm" actually mean?

Thanks.