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List:       linux-kernel
Subject:    Re: [linux-usb-devel] Problems with USB disk [solved]
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2007-09-13 14:12:11
Message-ID: Pine.LNX.4.44L0.0709131008360.3619-100000 () iolanthe ! rowland ! org
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On Wed, 12 Sep 2007, Mark Lord wrote:

> Chuck Ebbert wrote:

> >>> =========
> >>> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
> >>>     ASC=0x4 ASCQ=0x2
> >>> end_request: I/O error, dev sda, sector 126693711
> >>> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
> >>>     ASC=0x4 ASCQ=0x2
> >>> end_request: I/O error, dev sda, sector 126693711
> >>> sd 1:0:0:0: Device not ready: <6>: Current: sense key=0x2
> >>>     ASC=0x4 ASCQ=0x2
> >>> end_request: I/O error, dev sda, sector 126693711
> >>> =========
> >>>
> >> Using a new PSU and a powered hub made no difference. But I found a solution
> >> here:
> >>
> >> http://alienghic.livejournal.com/382903.html
> >>
> >> Basically, the problem is, as suspected, that the drive spins down / goes to
> >> suspend. This can be disabled with "sdparm --clear STANDBY -6 /dev/sda".
> >>
> >> It seems to me to be an error that the kernel reports this as something like
> >> a hardware failure. Or at least very misleading.
> >>
> > 
> > Oh, nice. The usb-storage (SCSI) disk spins itself down and we can't handle that.
> > Should we be disabling auto-spindown when we connect the device, or be able to
> > handle this by sending the start command when needed?
> 
> There's more to this.
> 
> My Sandisk Cruzer Micro 1GB USB sticks suffer from this regression.

I seriously doubt that.  Are you claiming that your USB stick spins 
itself down during a suspend?  And then requires to be spun back up 
before it will resume proper operation?

(Hint: Flash memory devices don't contain rotating media...)

Alan Stern

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