USB
power meter --Get dual display for up to 18v measurement. 1. Insert the SD card in your PC using a USB or
built-in card reader. Now open a Terminal
window, and enter the command sudo fdisk -l. This
will list all the filesystems present on your system.
2. Try to find out the device name of
your SD card. I have a 16GB SD card, so it is easily identified as
the device /dev/sdb which has a size of 14.9GB. This
is because the actual storage on a device is always slightly lower
than advertised. Note down this device name.
3. Use the dd command to write the
image to your hard disk. For example:
sudo dd if=/dev/sdb of=~/raspbian_backup.img
Here, the if parameter (input file) specifies the file
to clone. In my case, it is /dev/sdb, which is
my SD card’s device name. Replace it with the device name of
yours. The of parameter (output file) specifies the file
name to write to. I chose raspbian_backup.img in my
home directory.
Note:
Be careful, and double check the parameters before executing the
dd command, as entering the wrong parameters here
can potentially destroy the data on your drives.
You will not see any output from the command until after the
cloning is complete, and that might take a while, depending on the
size of your SD card. Once it is complete, you will see an output
like the following.
1. Insert the SD card in your PC. Before we
restore the image, it is important to make sure that the SD card’s
partitions are unmounted. To verify this, open the Terminal,
and execute the command sudo mount | grep sdb. Here,
replace sdb with your SD card’s device name.
If you see a blank output, you do not need to do anything. If you do see some mounted partitions, unmount the listed ones. For example:
sudo umount /dev/sdb1 /dev/sdb2 /dev/sdb3 /dev/sdb4
2. Use the dd command to write the
image file to the SD card:
sudo dd if=~/raspbian_backup.img of=/dev/sdb
This is like the command we used to make a clone, but reversed.
This time, the input file if is the backup
image, while the output file of is the SD
card device.
Again, verify, and double-verify the parameters here, as entering the wrong command here will cause permanent data loss.
Once the write is complete, you will see a confirmation from dd. You can then remove the card from your PC, and insert it back in the Raspberry Pi.