How can i copy dev / block / mtdblock from phone to my laptop

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Oct 18, 2011 11:58:36 AM via Website

I'm working on a project on forensic University Android phones.
I deal with the acquisition of physical data.
I would copy the partitions residing in dev / block / mtdblock on my laptop and mount them to see the content "offline."
I try to copy the partition with the command
"dd if = / dev/mtdblock/mtdblock1 of = / sdcard / data.dd bs = 2048"

but I have this error:

"/ Dev / block / mtdblock: read
error: I / O error
0 +0 records in
0 +0 records out
Transferred 0 bytes
in 0,004 secs (0 bytes / sec) "

It is not a permission problem on sdcard because I can not even copy the partition to another folder like / date.

how can I do this?
can anyone help me?