Macintosh hd
Can't download Macintosh Hd disk back.
MacBook Air 11″, macOS 10.15
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"Macintosh hd: Can't download Macintosh Hd disk back."
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Getting Macintosh Hd Back:
A. Mount the Drive:
Probably because you have yet to mount the drive. To mount the drive, boot up in Recovery Mode [Hold Down: command + R upon boot] and then select Disk Utility. From there, mount the drive. If it is already mounted, then unmount it and then mount it. Also, click the First Aid button for each volume of the drive.
B. A Reinstall May Work:
Reinstall the macOS:
Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be, respectively. Go Here: How to reinstall macOS from macOS Recovery - Apple Support
Important:
Create a Time Machine Backup, First:
Prior to the re-installation of your macOS, be certain to backup your Mac using a Time Machine Backup. That way, you can have something to restore your Mac from, should anything go wrong with the reinstall. Use an external hard drive that is at least 1.5 the total storage capacity.