Raspberry Pi 4 Usb Power Limit

[serkan190]

I use two hard drives
one harddisk 0.85 Amps, the other harddisk 0.55 amps
my server doesn't run both at the same time
because I've read that the usb's give a total of 1.2 amps
Is there a way to increase power
I want to run two harddisk at the same time and raid but usb power output is not enough
I am using a 3 amp offical power adapter
max_usb_current=1 setting, but the result is the same

[trejan]

Maximum is 1.2A. Only way to increase it is to use a powered USB hub.

The max_usb_current setting is only for the RPi B+ and 2 which defaulted to 600mA but changed to 1.2A if you set that value. It doesn't do anything on a RPi 4.

[drgeoff]

1. Use a powered USB hub.

2. max_usb_current has no effect on a RPi4. (And some other RPi models.)

[serkan190]

I solved the problem by getting the power of one of the hard drives from the gpio pins
currently two hard drives work without power problems

https://youtu.be/L1HUaal6-vI?t=725