#6 standby Seagate IronWolf NAS HDD

[Morpf]

Hello,
I can not put my Seagate IronWolf NAS HDD ST4000VN008 - 4TB 5900rpm 64MB 3.5inch SATA600 into standby.
This is an extra HDD hard drive for NAS, it can not be that it does not support standby mode, or?

I am running a Raspberry Pi 3 B with Operating System: Debian Linux 9.4, Kernel and CPU: Linux 4.14.30-v7 + on armv7l, Processor information: ARMv7 Processor rev 4 (v7l) @ 76 bMips, 4 cores.

pi@myhomeserver:~ $ hdparm -V
hdparm v9.56

Output in the terminal:

pi@myhomeserver:~ $ sudo hdparm -y /dev/sda

/dev/sda:
 issuing standby command
SG_IO: bad/missing sense data, sb[]:  70 00 01 00 00 00 00 0a 00 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
pi@myhomeserver:~ $

Cache is supported

pi@myhomeserver:~ $ sudo hdparm -I /dev/sda | grep 'Write cache'
           *    Write cache
pi@myhomeserver:~ $

B flag

pi@myhomeserver:~ $ sudo hdparm -B127 /dev/sda

/dev/sda:
 setting Advanced Power Management level to 0x7f (127)
SG_IO: bad/missing sense data, sb[]:  70 00 01 00 00 00 00 0a 00 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 APM_level      = 127
pi@myhomeserver:~ $

Settings in /etc/hdparm.conf

#/dev/hda {
#       mult_sect_io = 16
#       write_cache = off
#       dma = on
#}

/dev/disk/by-uuid/2247a357-a869-45e7-9786-64308e6f1562 {
 write_cache = on
 spindown_time = 240
}

Please help me
Sorry for my bad English
Many Thanks