Issues with hd-idle

I have an 8TB western digital drive connected to my Linksys 1900ACS. It's configured and working fine, but installing hd-idle seems to have no effect. In luci I tried setting the disk to sda1, /dev/sda , etc. and it doesn't seem to have any effect.

Also tried installed hdparm and I get this

hdparm -S 5 /dev/sda1

/dev/sda1:
setting standby to 5 (25 seconds)
SG_IO: bad/missing sense data, sb[]: f0 00 01 00 50 00 00 0a 80 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Any ideas? The drive would spin down fine on stock firmware. I'm quite new to openwrt.

I get the same result from hdparm using /dev/sda ...

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