When a Pen Driver or SD card is formatted, all the data present on the card is deleted. As they are not permanently erased from the card or pen drive. Since they are just marked for deletion, you can undelete information from Pen Drive using a data recovery software. But there is possibility to permanent delete information from pen drive.
The following tutorial explains how to permanently remove already deleted information from your pen drive or any other partition making the deleted information (for the most part) non-recoverable. We are able to accomplish this task by zeroing out the empty space on the drive using dd. There are many great uses for dd, from forensic data recovery and data backup to zeroing out empty drive space.
Remember these commands will work only Linux distributed operating systems.
Zeroing out the empty space and making deleted information non-recoverable:
1. Create a dummy file named junk.bin on the USB flash drive.
2. Open a terminal and type sudo su
3. Type fdisk -l and locate the partition you would like to zero out.
4. Type mkdir /tmp/ddusb.
5. Type mount -o loop /dev/sdxx /tmp/ddsdb (replacing sdxxx with your partition)
6. Type dd if=/dev/zero of=/tmp/ddusb/junk.bin
7. Type rm /tmp/ddusb/junk.bin
Thats all. Now any empty space on this partition has been filled with zeros and the deleted information that was once on your USB flash drive has been overwritten.
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