I could read and write my external hard drive before. But now, I can’t read and create new folders on it. Get Info permissions says “read-only”. I don’t know what are the causes except the 4 port USB thing I’m using for other hard drives might have done something. I tried erasing the drive in Disk Utility, failed. Then, in the Finder sidebar, the drive isn’t showing up anymore. I tried the “Partition” option but it’s greyed out. What can I do? I’m so confused about that.
I think the permission for your external hard drive has been changed to read-only. You can change the permissions on your Mac easily. Right-click the drive in Finder or on the desktop and click Get Info, move to the permissions section, and change read-only to read & write next to your account. Then, you can create files on the external hard drive on your Mac.
How can you directly reformat your drive? That will erase all data on it. Fortunately, you can’t reformat your external drive on your Mac. I think your drive is corrupted after what you did to it. Now, what you should do is use a data recovery tool to recover files from the unreadable drive on your Mac.
iBoysoft Data Recovery for Mac is a professional data recovery application that supports restoring data on unreadable, inaccessible, and corrupted external hard drives, USB drives, and other storage devices. Simply Download iBoysoft Data Recovery for Mac and select your external drive, then, let it scan and recover data on it.
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Suggest you reformat the drive in Safe Mode on your Mac. Perhaps some processes interrupt the drive from being erased.