Mathias

sudo nano /etc/hdparm.conf
#Disk1 /dev/disk/by-id/ata-YOURDISK { # mult_sect_io = 16 # write_cache = off # dma = on spindown_time = 240 } #Disk2 /dev/disk/by-id/ata-YOURDISK { # mult_sect_io = 16 # write_cache = off # dma = on spindown_time = 240 } 240 = 20mins - It works at my setup, i did't try lower spindown time.
 
Some drives can bee spun down with hd-idle. change HD_IDLE_OPTS value, then start and activate hd-idle.service. let me know if it works. Thanks.

@IgorThanks! Now I need to deliver... :-)
 
@chweNo, I'm using a "noname" enclosure that is based around the JMS578. But again, it just works great when connected to my laptop (with Debian Buster) and always makes trouble on the RockPro. I wanted to make sure this is not a problem with power, so I used a 6A power supply (universal power supply designed for laptops) and got the same trouble. But I'll try again with this power supply and the "stable" 4.4 kernel and either come back with a big smile on my face or with a backtrace...