Questions about the dd command
ebashi at gmail.com
Sat Mar 1 05:15:34 UTC 2008
On Fri, Feb 29, 2008 at 11:09 AM, elmo <elmo at ne.rr.com> wrote:
> I've spent literally hours trying to find direct answers on the dozens
> of websites that discuss 'dd'
> but the couldn't find what I wanted.
> A few questions about the ' dd ' command:
> For example: sudo dd if=/dev/sda2 of=/dev/sdb2 bs=1440
> 1. Which is preferrable; execute the command from an installed
> ubuntu (/dev/sda2) or from a ubuntu CD?
> 2. How do you modify the example to show the data as it is being
dd will not show you what kind of data it is copying. If it did, it
would look like a bunch of 0s and 1s. All kidding aside, dd does a bit
per bit copy. It does not care what the data looks like.
> Would this have a drastic effect on how long it takes to complete
> the copy
> compared to just watching a blinking cursor?
If you want to see progress instead of a blinking cursor, I would use
"dcfldd". Is pretty much "dd" on steroids. You can run it as follows:
dcfldd if=<source> of=<dest> status=on
Of course you'd have the install it before you use it
> 3. What effect on the does the ' bs = ' number have on
> the time to complete the copy or the accuracy of the copy? Is
> there a
> default number if the the bs= is omitted from the command?
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