I have used dd for making copies of CF cards all the time, with good
results -- but copying for one size CF to another is not always
reliable, especially if the geometry of the cards is really different.
In fact, at least in my experience, because CF card makers are known to
change the internals of their cards from one batch to the next w/o
telling anyone, even dd'ing from the same brand of, say, 512MB card to
another 512MB card from the same maker can result in some strange
results, when examined by fdisk, if the cylinder count varies.
The best results for me come from manual partitioning and formatting,
and using grub-setup plus tar to move the actual files from one card to
the next. Thia becomes more apparent with the bigger the CF cards,
espeicallty when a lot of the card is left for data. DD'ing a 4GB CF
takes a dog's age, even with a fast CF PIO mode drive. There is really
good example code for this kind of thing in the voyage scripts, which
use a file-based model rather than an image on to create bootable voyage
systems, I believe.
Cheers,
- Michael
Ron Wickersham wrote:
On Thu, 4 Sep 2008, Matt Jenkins wrote:
Wouldn't using dd only allow this img to be copied to another cf card
of the same size?
- Matt
the "to" device can be the same or larger. it makes the larger device
look
the same size as the original, however, so you can't simply use the
additional space for anything.
so far as i know, df in both the *bsd and GNU varieties just reports a
list of the filesystems mounted and their size, usage, and mount points.
in my mind df stands for "disk free" (space) and so far as i know no
version supports arguments that make it work like dd.
-ron
Ron Wickersham wrote:
On Thu, 4 Sep 2008, Bruce Sutherland wrote:
Matt,
I have done this using the df utility. You can block copy the
entire flash
disk on a machine with a CF reader. I copied it to an image on my
hard disk
drive. Then, you can use df to copy it back to other CF cards as
many times
as you like.
Basic syntax is:
df if=/dev/<CF reader device> of=./voyage_0.5.2_image.img
Regards,
Bruce.
Bruce,
perhaps dd (not df)
-ron
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