Even flash drives need power to complete write operations successfully, and you might unplug one too soon. For example, suddenly cutting power to a spinning hard disk could potentially damage the drive. For some smaller devices that receive their power from the USB or Thunderbolt socket itself, this can be a big deal. This was a much bigger deal back in the days when USB throughput speeds were slow (and Macs were slower as well), but even now, you could still potentially wreck your data if you unplug too soon after you think a copy process is complete.Īnd finally, ejecting allows your Mac to safely remove power from the device when all data transfer operations are complete. Ejecting allows the cached write process to finalize before you unplug, ensuring that no data will be lost. The second major reason for ejecting is that sometimes, your Mac speeds up the apparent write process to a removable drive by temporarily keeping a copy of the data being copied in memory. When you eject your drive, you are alerting macOS that you are about to unplug a drive, and this gives macOS and any applications you’re using a chance to complete all read and write operations before you unplug.
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