Matthias Apitz <g...@unixarea.de> wrote:
> El d?a Friday, November 19, 2010 a las 08:51:38PM +0200,
> Alexander Motin escribi?:
> > > Could it be that unwritten/unformatted blocks are read as
> > > random data from that USB key? Should I overwrite the full
> > > USB key from /dev/zero?
> > It is allowed behavior for SATA SSDs with TRIM command support.
> > Deleted blocks can be not guarantied to return any predictable
> > or even repeatable value. May be this logic could be extended to
> > USB devices.
> A cmp(1) with -l gives a file like this:
> $ head -10 diff
> 196971771 134 34
> 196971797 134 34
> of 2385059 lines, i.e. of 2385059 bytes which differ in the 3.8
> GByte copy; there are only a few patterns of diffs which are
> What does this mean? Does not look like errors, in case of random
> error it whould be more caotic, or?
To help sort out whether it matters, what happens if you read the
stick using dump(8) instead of dd (or mount it read-only and read it
with tar)? Either of those methods will read only the parts that
are in use.
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