Okay, so what's the best way to image an SD card then? I use the following on a ...

sfink · on May 23, 2022

Do these not work?:

    gzip < /dev/sda > img.gz
    gunzip < img.gz > /dev/sda

Those should give you better block sizes than default dd without bs=128k or whatever.

bzbarsky · on May 23, 2022

For your first command:

    gzip -c /dev/sda > img.gz

For your second command:

    gunzip -c img.gz > /dev/sda

are what I suspect the blog post would recommend.

usui · on May 23, 2022

I would install pv (optional) and do

cat /dev/mmcblk0 | pv -abtrN Processed | gzip > img.gz

cat img.gz | gunzip | pv -abtrN Processed > /dev/mmcblk0

_kuvn · on May 23, 2022

this is not the point of the article, but you may want to specify blocksize in those commands? ymmv tho