OK.New one. Verbatim. Class 4.
The ones that you originally tried, what were they used for in the past
and what were they formatted to?
Did they have any partitions and were any of them bootable?
It would be very interesting to format them again then use dd and see if they work.
It depends on what you need/using it for.I was told by the geek in the games shop that you can get up to class 10 - 10 is the best?
Class 10 is certainly the fastest for general use but in your case not compatible with Pi.
As regards the possible dd problems with the version used in Puppy,
have you tried copying the dd that comes with another distro over to
Puppy and use that?
Since it's not a GUI type app, the dependencies will be much lower
and it may just work on Puppy.
I have had many CLI apps work across various distros with no problems at all.
I have also compiled many of my own apps in Puppy and successfully used
them on Gentoo.
Generally "normal" ELF (non-X) binaries will work across distros and kernel versions.
It's only .ko (kernel object files) that are very picky about kernel versions.
Do a "ldd" on both dd's to see if the dependencies are the same.