boot - "No bootable devices found" after formating SD card by $ dd if=/dev/zero of=/dev/sda bs=4MB - Ask Ubuntu


i trying format -4gb- sd card, failed format directly, found can 0 out by:

sudo unmount /dev/sda  sudo dd if=/dev/zero of=/dev/sda bs=4mb

after running these commands, stopped process take time, after while browser stopped , couldn't open again, tried log out , sign in again working again, laptop froze time did force shutdown.. turned on again each time 

no bootable devices found

how can laptop working again without losing data?

......

laptop model: dell inspiron 5559

installed oses: ubuntu 16.04 , windows 8.1

ah, you've met fabled disk destroyer, eater of data.

i'm going assume have single actual hard drive in computer, present @ /dev/sda.

when unmounted /dev/sda (which nothing, way), targeting computer's hard drive. same command broke everything. let's break down:

sudo dd if=/dev/zero of=/dev/sda bs=4mb

in command, you're overwriting /dev/sda (your hard drive) /dev/zero (or no data). called dangerous idea, , why should really triple-check dd commands. data erased gone forever 0 hope of recovery.

now, possibly use photorec (works on non-photos, too!) recover files possibly spared being destroyed command, no longer able recover everything. if try photorec, use live image, , don't touch drive.


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