hdparm APM_Level not supported? Ironwolf Pro via USB

Trying to stop my 18TB Ironwolf Pro which is attached via USB to my Pi4 from sleeping so aggressively.

However I get the below, any ideas? This happens no matter which value I use, 0, 254, 255 etc...

LibreELEC:~ # hdparm -B 255 /dev/sda

/dev/sda:
 setting Advanced Power Management level to disabled
 HDIO_DRIVE_CMD failed: Input/output error
 APM_level      = not supported

Worked out my drive supports EPC.

Quote from JoeAverage

and what is EPC ?

Extended power conditions. A newer type of power control command set than traditional APM.