Re: dead device - usb mass storage

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Sat, 8 Dec 2007, Cédric Villemain wrote:

> Hello,
> 
> I have an hard drive which is dying. So I use the great tool
> "dd_rescue" to recover it.
> 
> The main issue is that after few error, I have the following from
> syslog (which obviously stop the dd_rescue).
> 
> How can I prevent usb to detach the mass storage device even if there
> is lot of errors ? (actually i unplug/replug the device to continue
> the test)

> Dec  8 12:57:34 agecanonix kernel: usb 4-6: reset high speed USB
> device using ehci_hcd and address 14
> Dec  8 12:57:39 agecanonix kernel: usb 4-6: device descriptor read/64, error -71
> Dec  8 12:57:39 agecanonix kernel: usb 4-6: device descriptor read/64, error -71

> Dec  8 12:57:41 agecanonix kernel: sd 5:0:0:0: scsi: Device offlined -
> not ready after error recovery

It's not possible to prevent the detach, because the detach is done by 
the device itself rather than by Linux.  That's why you have to unplug 
the device to make it start working again.

Alan Stern


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