If you have ever got a large amount of data you want to wipe from a USB stick on a Mac you have 2 options select all and delete the files on the pen stick or format the pen stick.
The issue with just deleted the files from the pen stick the actual data is still stored on the pen stick until you empty your recycle bin. The worst thing you can do is eject the drive without doing that causing the pen stick to not remove the data from the drive. This is a very common feature on a Mac not so much on a Windows PC however it does happen.
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