Re: [Bug-ddrescue] ddrescue produces 0 bytes output

[Paul L Daniels]

On Sat, 30 Mar 2013 21:46:29 -0400 (EDT)
Jay Ashworth <address@hidden> wrote:

> ----- Orig
> Rogerio is going to hate us.  :-)

        Let the debating begin... :)

> Don't *ever* try to do a drive recovery through a USB bridge: pull the
> drive out of the housing and hook it directly to a SATA port.  You
> can't trust a random USB bridge chip to have enough commands to do
> everything you need to do during a recovery.

        What sort of commands?  To date I've not had any problems with
        USB2 or USB3 external docking units.  I have found no troubles
        that I'm acutely aware of with powered USB external-drive
        enclosures either (Seagate); sometimes I have had hiccups with
        2.5" non-powered bridges, but that's somewhat to be expected
        due to the limited power, especially if the drive has a motor
        issue.  Overall I have found recovery via USB-bridges to be
        more dependable than eSATA or SATA directly, particularly if
        the drive resets frequently.  Though it's likely a
        kernel/driver issue I have found that when directly connected
        to the SATA interface I often have the drive become completely
        no-responsive to the system ( but reestablishes fine if you
        reboot ).   

        Different anecdotal evidence I suppose.

> I agree with cool, and you might find it worth freezing it, though
> you need to put it in a ziploc and press all the air out beforehand
> to avoid condensation. 

        No matter how much you press out, there's still enough moisture
        in the atmosphere contained in the drive that you'll get
        condensation on the actual platters when you pull it out of the
        freezer. If you must freeze a drive, then I suggest doing so in
        a very low humidity environment. I prefer to keep it between
        5~10'C so as to avoid dropping below the dew point.

Paul.

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