Copying out the content of a NAND flash

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I am trying to copy out my UBI/UBIFS flash that have gotten 2 LEB errors.

On the AVR32 side i issue the cmd:

dd if=/dev/mtdblock5 bs=128k conv=noerror 2> /dev/null | netcat -l -p 1234

On the PC host side i use:

nc 1234 | dd of=myLocalFile bs=128k

After I start the transfer it just goes and goes until I halted it at 21GB. ( the nand flash is only 2GB )

Anyone know what I am doing wrong?

Life's to short for waiting on slow CPU's