Some External HDD Questions

[Jorge Delacruz]

In my case, I needed to make an exact image of the
source drive, so I felt dd was the appropriate tool. 
I don't remember the bs - perhaps 1k?  

Thanks for the hint.

JD

--- Matt Graham <danceswithcrows at usa.net> wrote:

> From: Jorge Delacruz <alterthegrid at yahoo.com>
> > Matt Graham <danceswithcrows at usa.net> wrote:
> > > 2M/s?  That doesn't sound right for either USB1
> or USB2.
> > I plugged in a USB drive and [dd'ed] the internal
> drive to
> > a file on the external USB drive.  It took 9 hours
> to dd a 
> > 40 GB internal drive, so 1.2 MB/sec
> 
> What did you specify for bs= ?  32k or 64k would
> have probably
> worked the best.  If you don't specify a bs= , dd
> reads and
> writes 512-byte blocks.  This is ... suboptimal, as
> 64 reads of
> 0.5K take much longer than 1 read of 32K.
> 
> > I used USB2 hardware. Maybe this is a limitation
> with dd? 
> > The external hard drive's light blinks a lot and
> the box 
> > seems I/O bound when I do it.
> 
> Of course it's going to be I/O bound; you're doing a
> whole
> bunch of I/O.  See above for a possible explanation.
>  Also,
> dd is the stupidest backup method in existence as it
> copies 
> everything including blocks that aren't in use.  Use
> partimage
> or tar or rsync; that's what they're there for.
> 
> 
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