Format the SD-Card before dumping and OS-Image to the card.
If you are using an Unix OS everything can be done on command-line
Insert the SD-Card into the Card-Reader of the Unix-Workstation.
Issue the following commmand:
df -h
The output is a complete list of storage-media that is actual available on the work-station.
Idetify your card, on my workstation the SD-Card is always „/dev/sdb“
If the OS has automatically mounted the SD-Card unmount it now.
Therfor issue the following command:
sudo diskutil umount /dev/sdb1
or, as root:
umount /dev/sdb1
Now a:
df -h
Should not display any hint of /dev/sdb, now start to copy the image bit by bit to the SD-Card.
As user root issue:
dd of=/dev/sdb if=/home/2013-07-26-wheezy-raspbian.img bs=1M
Note: „of“ is the output-path, here /dev/sdb and „if“ is the input-path, here the wheezy image. The bit by bit copy will take a while.
SD-Card Backup and zip image:
dd if=/dev/sdb bs=1M | gzip > /home/k03b169/Downloads/Hot_Spot/Raspberry/ZipDD8GB.gz
Write zipped image back to SD-Card:
gzip -dc /home/k03b169/Downloads/Hot_Spot/Raspberry/image.gz | dd of=/dev/sdb bs=1M
