Verify your HDD capabilities for S.M.A.R.T, APM and AAC via the Diagnostic: Information page, ataidle Tab.

Examples of Advanced Hard Drive capabilities:

List of Advanced ATA capabilities on all ATA disk:
Results for ada0:
Device Info:

Model:			FUJITSU MPF3102AT
Serial:			31277991
Firmware Rev:		1402
ATA revision:		ATA-5
Geometry:		16383 cyls, 16 heads, 63 spt
Capacity:		9GB
SMART Supported: 	yes
SMART Enabled: 		yes
APM Supported: 		yes
APM Enabled: 		no
AAC Supported: 		yes
AAC Enabled: 		no
Note:	AAC = AutoAcoustic
	APM = Advanced Power Management
	SMART = Self-Monitoring, Analysis and Reporting Technology

Results for ada2:
Device Info:

Model:			SAMSUNG SP2014N
Serial:			S088J1RY906273
Firmware Rev:		VC100-33
ATA revision:		ATA-7
Geometry:		16383 cyls, 16 heads, 63 spt
Capacity:		127GB
SMART Supported: 	yes
SMART Enabled: 		yes
APM Supported: 		no
AAC Supported: 		yes
AAC Enabled: 		no
Note:	AAC = AutoAcoustic
	APM = Advanced Power Management
	SMART = Self-Monitoring, Analysis and Reporting Technology

From this you can see that on ada0, there is no value in setting APM or AAC for this drive as it is not supported. Similarly on ada2, APM is not supported, but AAC is support, but not enabled.

SMART is enabled on a system-wide basis via the System:Advanced page by checking the Enable the S.M.A.R.T daemon option and clicking the Save button.

S.M.A.R.T. is an attempt to predict imminent drive failure by monitoring selected drive performance and calibration characteristics. Each monitored characteristic (Attribute) is used to calculate an Attribute Value. Attribute Values range from 1 to 253 with 1 being worst case, 253 being best case, and 100 being nominal.

For WD drives, the normalized attribute value will range from 1 to 100 or 1 to 200, depending on the attribute. Error rate, total spin ups, spin up retries and calibration retries attributes are implemented as during normal operation (“on-line”); whereas, Multi-zone Error Rate test is performed “off-line”. This test performs a read-verify-all operation and calculates an error rate. These Attributes are updated and stored on the drive in the reserved area of the disk. Also stored on the drive is a set of Attribute Thresholds that correspond to the calculated Attribute Values. An impending degrading or faulty condition is indicated when the calculated Attribute Value becomes less than or equal to its corresponding Attribute Threshold value.

The drive periodically saves all data associated with the S.M.A.R.T. feature. The data is written to the reserved area of the disk after certain time of inactivity by the host. The save of the data is performed in the background and will not cause a decrease in performance.

Below examples of Diagnostics > Information > S.M.A.R.T.

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68AX9N0
Serial Number:    WD-WMC1T0941506
LU WWN Device Id: 5 0014ee 602e027c8
Firmware Version: 80.00A80
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Sun Sep 30 23:56:23 2018 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)	Offline data collection activity
					was never started.
					Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever
					been run.
Total time to complete Offline
data collection: 		(38160) seconds.
Offline data collection
capabilities: 			 (0x7b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities:            (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability:        (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine
recommended polling time: 	 (   2) minutes.
Extended self-test routine
recommended polling time: 	 ( 383) minutes.
Conveyance self-test routine
recommended polling time: 	 (   5) minutes.
SCT capabilities: 	       (0x70bd)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   182   178   021    Pre-fail  Always       -       5875
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       159
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   031   031   000    Old_age   Always       -       51088
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       157
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       114
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       44
194 Temperature_Celsius     0x0022   121   098   000    Old_age   Always       -       29
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Conveyance offline  Completed without error       00%         0         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

Each SMART attribute indicates a certain characteristic of the drive and has its own value derived from a special normalization algorithm and formula. The attributes listed below are specific to WD drives. Other drive manufacturers may have their own attribute definition.

RAW Read Error Rate: This attribute indicates the average rate of read error retries.

Spin Up Time: This attribute indicates the average spin up time, which describes amount of time it took to spin the platters up to their rated rotation speed.

Start/Stop Count: This attribute indicates the amount of drive's start/stop cycles.

Reallocated Sector Count: The attribute indicates the amount of bad sectors relocated to a spare area.

Seek Error Rate: This attribute indicates the average rate of seek errors.

Power On Hour Count: This attribute indicates how long the drive was working (powered on).

Spin Retry Count: This attribute indicates the number of retry of drive spin up at power up.

Calibration Retry Count: This attribute indicates the number of retry of drive calibration after spin up.

Power Cycle Count: This attribute indicates the number of disk power cycles.

Relocation Event Count: This attribute indicates the number of times recalibration was requested. “

Current Pending Sector Count: This attribute indicates the amount of sectors pending for relocation. Sectors with read or write errors are recorded and await relocations to spare sectors when next write commands are issued.

Off-line Scan Uncorrectable Sector Count: This attribute indicates the number of firmware uncorrectable error sectors detected during the last off-line scan.

UltraDMA CRC Error Rate: UDMA controller performs a CRC error checking on data while transferring between the host and HDD. Each time the error occurs, a retransmission is requested. This attribute indicates the average rate of the CRC errors.

Multi Zone Error Rate: This attribute indicates a rate at which write retries are requested.

GMR Head Amp: This attribute indicates the amplitude of GMR (Giant Magnetoresistive) head.

Temperature: This attribute indicates the temperature for drives equipped with thermal sensor.