How do I safely remove external hard drive from my mac air?
How do I safely remove an external hard drive from my Mac air?
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See the following from Use external storage devices with Mac - Apple Support
Eject a storage device (USB drive, flash drive, or other device)
On your Mac, do one of the following:
- Select the item to eject, then choose File > Eject.
- In the Finder sidebar, click the Eject buttonÂ
 next to the item’s name. - On the desktop, drag the item that you want to eject to the Trash.
If you can’t eject a storage device, another app or user may be using one or more files on the storage device. See If an app is using a disk you want to eject and If another user is using a disk you want to eject.