Comfortable dd bs= parameters for different media

[Giorgos Keramidas]

On Sun, 25 Jan 2009 02:11:11 +0100, Polytropon <freebsd at edvax.de> wrote:
> Hi,
>
> I'd like to ask which sizes are comfortable to use for reading
> from different media using the dd utility. As far as I know,
> these are good values:
>
> 	Format		Device (example)	bs=
> 	-------------	---------------------	----
> 	Data CD		/dev/acd0		2048
> 	Music CD	/dev/acd0t01		2352
> 	DVD		/dev/acd0		2048 (?)
> 	Hard disk	/dev/ad0s1g		1m (?)

AFAICT these are fine.

> What about copying partition-wise from a hard disk to a dd file?
> Which bs= parameter would be encouraged to use?

Presumably the destination file will also be on hard disk (or USB flash,
or SSD).  It may be ok to use 1m then :)