HDD not sleep
/sys/block/sda : /sys/devices/platform/rdb/f0471000.xhci_v2/usb2/2-2/2-2.4/2-2.4:1.0/host2/target2:0:0/2:0:0:0
opkg install hdparm(this is a more extended version) is ok
root@gbquad4k:~# hdparm -C /dev/sda /dev/sda: drive state is: active/idle root@gbquad4k:~# hdparm -y /dev/sda /dev/sda: issuing standby command root@gbquad4k:~# hdparm -C /dev/sda /dev/sda: drive state is: standby
maybe add xhci_v2 as internal hdd?
root@gbquad4k:~# opkg remove hdparm Removing hdparm (9.60) from root... update-alternatives: Linking /sbin/hdparm to /bin/busybox.nosuid root@gbquad4k:~# hdparm -C /dev/sda /dev/sda: hdparm: HDIO_DRIVE_CMD: Invalid argument drive state is: unknown root@gbquad4k:~# hdparm -y /dev/sda /dev/sda: issuing standby command hdparm: HDIO_DRIVE_CMD: Invalid argument