Comfortable dd bs= parameters for different media

2009-01-24 Thread Polytropon
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/acd0t012352
DVD /dev/acd0   2048 (?)
Hard disk   /dev/ad0s1g 1m (?)

The usual command is

% dd if=/dev/see-above of=somefile.dd bs=whatever

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



-- 
Polytropon
From Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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Re: Comfortable dd bs= parameters for different media

2009-01-24 Thread Giorgos Keramidas
On Sun, 25 Jan 2009 02:11:11 +0100, Polytropon free...@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/acd0t012352
   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 :)

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Re: Comfortable dd bs= parameters for different media

2009-01-24 Thread perryh
 I'd like to ask which sizes are comfortable to use for reading
 from different media using the dd utility ...

In case anyone still cares, I have long used bs=120b for floppy
disks.
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