I recently installed Windows in dual boot with Linux (on two different SSDs) and I noticed that Windows automatically “shuts down” or stops the HDD if it is not being used.
I have a HDD (WD) connected by SATA cable where I usually keep my games. The HDD is not always in use but it is always constantly running and honestly the noise it makes is quite noticeable. I’m sure I don’t have any program in the background using it constantly.
I have already tried to solve this problem using hdparm and hd-idle and although in theory they work I still hear the noise from the HDD.
- If your only concern is noise (and not saving power), then the easiest solution is to just sound-proof your case - install some foam pads or something to dampen the noise. Check out https://www.quietpc.com/acousticmaterials to get an idea of what’s out there and what you can use, but even simple random foam that you’d get in parcels would work to start off with. 
- Checkout smartctl. You can either force shutdown immediately or after some idle time. Command is something like this: - smartctl -n -s standby,VALUE /dev/sda with value either “now” or something between 0 and 255. From the manpage: - Values from 1 to 240 specify timeouts from 5 seconds to 20 minutes in 5 second increments. Values from 241 to 251 specify timeouts from 30 minutes to 330 minutes in 30 minute increments. Value 252 specifies 21 minutes. Value 253 specifies a vendor specific time between 8 and 12 hours. Value 255 specifies 21 minutes and 15 seconds. - Value 252 specifies 21 minutes. - That’s interestingly specific. Any idea why? - @Revan343 @Unimeron 
 The ATA specification takes the values that way. https://people.freebsd.org/~imp/asiabsdcon2015/works/d2161r5-ATAATAPI_Command_Set_-_3.pdf
- 252 * 5 sec = 1260 sec or 21 min. I wonder what 254 does… 
 
- I tried it and it does not seem to work unfortunately, at this point I think my HDD does not support the function to enter standby, although in Windows it does. - Did reformat the drive recently to ext4? there’s a background process running that’s doing deferred stuff which keeps the drive busy. try to unmount the drive to ensure it’s idle. 
 
 
- You may want to research this some more. Spinning the drive up and down adds wear on the mechanical parts, and will lead to the drive failing a lot sooner. - Maybe you’re okay with that tradeoff, just thought you should at least be aware of it. 
- Maybe you can unmount the HDD, then no process can access it and hd-idle could work. - I tried it and it didn’t work… Thanks for the idea actually, I hadn’t thought about it. 
 




