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    SubjectRe: USB attached SATA disk idle spindown
    Stefan Richter wrote:
    > (adding Cc: linux-usb and Johannes Niess)
    > On 6/24/2008 6:59 AM, Jonathan Steinert wrote at LKML:
    >> Dear list,
    >> I am looking for what the current state of USB SATA timed spindown of-
    >> disks is ata this time. I've been reading documents and mailing lists-
    >> for every possible search I can dream up on the subject. Suggested-
    >> workable solutions include (but are probably not limited to):
    >> $ hdparm -S
    >> This seems to be the ATA way of telling a disk to spin down, and it
    >> works in some situations, but doesn't appear to work on USB attached
    >> disks under 2.6.25
    >> $ sdparm
    >> This is suggested in a small number of locations. Most of which have
    >> examples on how to disable STANDBY on a handful of devices. I am
    >> unable to find any evidence that it can actually be used to enable
    >> power saving.
    > I think either of these depend on specific support by the USB to SATA
    > bridge firmware.
    > I hear some newer bridges and their firmwares implement ATA
    > pass-through. Would that help?

    Yeah, ATA pass through is all that's needed for hdparm -S to work.


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