Re: Questions about the dd command

elmo 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?

There is no point to using dd from a CD-Rom. That is silly.


2. How do you modify the example to show the data as it is being
copied?
Would this have a drastic effect on how long it takes to complete
the copy
compared to just watching a blinking cursor?

There is no way I know to see what is happening.
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?

If you do not use a bs= it uses the default which is dead slow. I use bs=10000 and it is much quicker.


Suggest you read man dd where all these things come from.

Karl








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Karl F. Larsen, AKA K5DI
Linux User
#450462 http://counter.li.org.
PGP 4208 4D6E 595F 22B9 FF1C ECB6 4A3C 2C54 FE23 53A7


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