ataidle is also in the repos - description:
A utility to manage ATA drives
ATAidle is a utility to set the power management features of ATA hard drives in FreeBSD and Linux, including idle and standby timeouts, APM, and acoustic level settings.
Thanks but still don't understand how should I use it. The help output for is:
"
ataidle
ataidle version 2.5
usage:
ataidle [-h] [-i] [-s] [-o] [-I standby_mins] [-S standby_mins]
[-A aam] [-P apm] device
Options:
-h display this help
-I enter idle mode and set the standby timer (minutes)
-i enter idle mode
-S enter standby mode and set the standby timer (minutes)
-s enter standby mode
-o enter sleep mode
-A set the AAM (acoustic) level (1-127)
-P set the APM (power) level, (1-254)
device the device node e.g. /dev/ada0
standby_mins is in minutes and has a range of 1-21, then 30-330 in 30
minute steps.
If no options are specified, information about the device will be displayed.
"

Otherwise I founded this one:
hdparm but despite that I have Seagate according with the following coomand :
"
hdparm -i /dev/sdb
/dev/sdb:
Model=Seagate FreeAgent GoFlex, FwRev=0110, SerialNo=NA0B776K
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=1953525168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=no WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-4,5,6,7
* signifies the current active mode"
The following option hdparm -Z /dev/sdb doesn't work and the output of was:
"
disabling Seagate auto powersaving mode
HDIO_DRIVE_CMD(seagatepwrsave) failed: Input/output error"
Bottom line I believe this hdd is already setup for non usage of Advanced Power Management so actually my problem is solved without doing anything

But for others who need some hdd CLI configuration / interrogation tools those ones may be useful.