Trying to restore files directly on the failed disk is not a good idea. The size of the partitions provides further evidence, as does the output by theįigure 3: The last entry in fdisk confirms that sde is the SD card. You can use the label column for orientation. The command outputs a list of all the connected media and their device files (Figure 1). Which you need to run as root, like all the other commands in this article. The command to help you with this is blkid -o list Next, you need to find out which device file you can use to access the defective medium. Do not mount the data storage medium, even if Linux suggests doing so. An SD card, for example, can be slotted into a USB card reader and plugged into the Linux PC. When Linux is running, connect the defective medium. If it does not have Linux installed, you can simply boot from any Live CD. Now you can boot the PC on which you want to perform the rescue. This method is quite common with swap partitions – or partitions that Linux incorrectly assumes to be swap.
A hard drive or SSD with less important data can be removed and plugged into an external USB enclosure, which at least prevents the Linux system used to rescue data from arbitrarily using the same disk. For critical data, you can buy a write-protection adapter, as used in computer forensics. USB sticks, hard drives, and SSDs usually do not have a write-protect switch.
The memory card from the digital camera, in the case initially described, turned out to be a slightly older 2GB SD card write-protecting it was easily accomplished by moving the small write-protect tab on the right side.
This means that the rescue attempt cannot destroy the operating system, and the rescue tools cannot destroy the data. First, you should enable physical write protection for the defective medium as soon as possible.
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