USB hard disk unable to spin-down

[Ferrets]

I am using a PogoPlug series 4 with Archlinux installed, but when I tried to spin-down my Seagate Expansion Desk 3T using hd-idle, the hard disk will spin-down and spin-up immediately.

At the same time, my old Western Digital My Passport 500G works fine, can be spin-down and won't spin-up untill the next time I access it.

here is some information:
$this->bbcode_second_pass_code('', 'root:~$ lsusb
Bus 001 Device 002: ID 0781:5567 SanDisk Corp. Cruzer Blade
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 0bc2:3312 Seagate RSS LLC
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 1058:1023 Western Digital Technologies, Inc. Elements SE
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
')

I've followed the installation guide to do the installation, and upgraded all the package.