ntfs HD with io errors

Polytropon freebsd at edvax.de
Mon Apr 16 17:23:00 UTC 2018

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... :-(

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

More information about the freebsd-questions mailing list