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Date:      Mon, 16 Apr 2018 19:22:55 +0200
From:      Polytropon <freebsd@edvax.de>
To:        Ernie Luzar <luzar722@gmail.com>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: ntfs HD with io errors
Message-ID:  <20180416192255.bb846fcb.freebsd@edvax.de>
In-Reply-To: <5AD4CE4A.5020408@gmail.com>
References:  <5AD4AE2A.80400@gmail.com> <20180416163812.ed284db3.freebsd@edvax.de> <5AD4CE4A.5020408@gmail.com>

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On Mon, 16 Apr 2018 12:24:42 -0400, Ernie Luzar wrote:
> Since the mbr was deleted looks like win10 got a malicious virus that 
> made the external usb HD un-mountable and screwed with the last file I 
> had open. Nothing physically wrong with the HD.

Your further comments suggest something different (unless
I'm misunderstanding something, of course).



> All ready used dd_rescues and recovered 50% of user data which had no 
> i/o errors. dd_rescue could not fix any of the i/o errors.

But dd_rescue does not operate on files, it processes the
input device as blocks. Block I/O errors often indicate
a hardware defect. However, it _could_ also be a problem
with your SATA->USB configuration. Do you have a chance
to try a differnt adapter? Or can you attach the disk
to an SATA connector natively?



> Read the man on dd and found no mention of skipping "free space" IE; 
> unused space in the allocated partition.
> 
> Only 600gb of data on the 3tb HD.
> 
> Looking for method to copy this data to 1tb HD bypassing i/o errors.

The problem is: The I/O errors are probably _within_ the
data you want to copy, and the data itself maybe is not
contiguous (i. e., fragmented), so having a bigger disk
at hand is _never_ wrong. You cannot "read around the holes"
and expect to get a mountable NTFS volume from it... :-(



-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...



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