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Also, this method can be followed for single card multi boot flashing as well
Note: These steps are not required for brand new SD card and you can skip
Deletion of partition using Disk tool in Ubuntu:
1) Select particular SD card from left hand side panel and click on '-' symbol of Disk tool
2) Click on Delete button to delete any particular partition
3) Finally deleted all the partitions:
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For example content of sd_part_size looks like:
[Here we have taken 1 SD card of 16GB and 3 others of 32GB each.]
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