![]() In another terminal window, become the superuser again (as outlined above) and type this command: ps -ax | grep dd Lastly, if you are fully wiping a device in this manner or transferring a large image, there is a way of seeing how far along the process is. In linux, you can transfer this image to an SD card by this command: dd if=/home/userdir/Downloads/noobspackagefile.img of=/dev/sdbĪgain, assuming that the card you want to write to is mapped as /dev/sdb, and set the directory & name of the downloaded NOOBS image correctly in your if= statement, that will transfer the file sector-by-sector to the SD card that you can then set as your boot device on your Raspberry Pi and boot from it. Let's say you just downloaded a newer version of the NOOBS package for your Raspberry Pi. This will be much faster than wiping the full SD card.Īs an aside, the dd command is also useful for writing disk images to the SD card. The count= parameter will only copy zeroes to that number of sectors and then will quit. To only wipe the beginning part of the card, add a parameter to the dd command: dd bs=512 count=100000 if=/dev/zero of=/dev/sdb Now, if you did have a corrupted partition table but you're not worried about wiping every single sector, usually the first 10k-100k sectors are sufficient to wipe, then repartition the card with fdisk. I should also warn you, that the command by default has no output until it has completed, so it might look like it's not doing anything, but it is. This command will take a very long time to complete, but when it's done your card will be completely blank. So, what this command does is write zeroes to every sector on the card, thereby wiping it. of= is 'Output File" and again, you're not writing to a file per se, but writing to the raw disk device. In this case, you're pulling input from a device that does nothing but return zeroes whenever requested. if= specifies the 'input file' but this description is a bit misleading as it can be any named pipe, device, etc. The bs parameter is short for 'byte size' and 512 is usually the sector size for SD cards. The dd command is a very low-level command in Linux and can basically copy anything to any device. You'll need to be root to run the next command, and for the tutorial I'll assume that you have already ascertained that the SD card you want to wipe is /dev/sdb: dd bs=512 if=/dev/zero of=/dev/sdb ] this will allow you to become the 'root' user or superuser in linux. From the terminal session, type these commands: sudo su. ![]() There is another way of wiping the card completely - including the partition table - albeit it can take a long time. The link that Steve and Havnar gave have good information, but I have seen where fdisk can get 'confused' if the partition table itself is corrupted, or if a 3rd party partition manager was used on the card (although admittedly, those aren't nearly as common nowadays as they once were). ![]()
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