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Old 08-05-2009, 06:55 PM   #1
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No performance improvement between hdparm -y vs -Y; laptop HD


So I've scoured the boards for more information about hdparm, but I haven't quite found anything like my problem.

My intention is to reduce the power consumption/current draw on my embedded setup; I am basically doing initial tests by measuring the current from the power supply and checking the changes as i let the drive idle or if I issue a forced standby/sleep command.

Drive Specs:
*I've also tested this on a Seagate laptop drive
5V power supply
Without a HD attached, I get about ~600 mA on my board
With a drive in Idle I'm probably around ~840 mA
If i issue a hdparm -y /dev/sda , I get about 770 mA
I check my status with hdparm -C /dev/sda it says it's in "standby" mode
If I wake the drive and I try to issue a -Y (sleep) command, I see no performance gain: ~770 mA

So according to the drive spec, a device in sleep should only be an additional 30 mA and standby would be 50 mA. Meaning I should see a total current draw of around 630 or 650 mA; I can only assume the drive is only getting as low as power mode 3 which is still 170 mA. That makes sense since I jump from 600 mA to 770 mA.

Anyone know if laptop drives do not read ATA commands correctly? I have the same problem on 2 different WD drives and a seagate drive. While the disc feels like it stops spinning at Standby/sleep commands, there has to be a reason why i'm still wasting 170 mA in "sleep" mode. If someone could shed some light on my situation it would be very much appreciated. Thanks in advance.



hdparm, power, sleep, standby

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