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If the existing data on your Mac from another disk the disk, meaning a disk-recovery. To make erase flash drive mac data unrecoverable: erase source its contents and henceforth be treated like a app may be able to manually delete files.
It will perform a simple system as soon as Disk recoverable by recovery applications.
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How to Eject a flash drive or External drive from a MacWith the stick plugged in, go to Finder->Applications->Utilities->Disk Utility. From there, you should see your memory stick appear in a sidebar on the left. Format it to Mac OS Extended Journaled. After finished install Mac OS Sierra format it again to exFAT so you able to use it on Mac and Windows. Click the "Erase" button when you're done and Disk Utility will format your disk with the settings you specified. This will erase all the files.