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Hi. I'm pretty sure it is possible; I just searched through the USB 2.0 spec and there are mentions of a PORT_POWER bit that can be cleared to power off a port (if the hub supports it; some don't). In section 11.11 it says: Self-powered hubs may have power switches that control delivery...

Oh, ok. I assumed it would power it down completely. Maybe. :) But using hdparm in Linux I can query to see if the drive is in one of three states: "active/idle (normal operation), standby (low power mode, drive has spun down), or sleeping (lowest power mode, drive is completely shut...

Hi again. I'd like to power off a particular USB port (the one a particular external hard disk is connected to). Is there a command line program included with the OS that can do this? Or does anyone know of one I can get? Poking about, it's probably possible to write one with the IOKit...

Hi everyone. I have my Mac Mini set to power off hard disks after some time of inactivity. I think my external USB hard disk is not being powered off. Is there some way I can check this? Is there an equivalent of the hdparm utility in Linux? Thanks, Cameron