Right-click or hold Option and click on the drive icon, either in the main Finder view or in the sidebar. In the menu that pops up, select Decrypt [DriveName] —of course, DriveName will actually be the name of the drive.
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- Getting Started.
This only works if you know the password. To render a drive read-only, right-click the drive, then select Get Info.
This will prevent unwanted users or groups from deleting, adding, or changing files on the drive. Right-click on the drive, then select Encrypt [DriveName] on the drive you wish to encrypt. Then hit Encrypt Disk and wait for the process to complete. Before you proceed, be aware that this will erase all the data on the drive.
In any case, backing up is always a good idea. Formatting a hard drive for use with your Mac? Here are your macOS file system options and how to pick the best one for you.
How to Format Seagate Drive for Mac and PC Quickly and Securely?
Read More. Now select your drive in the menu on the left side, and right-click or hold Option and click on the icon, then choose Erase. On the next screen, you can name the drive anything you like in the Name section.
You can also choose the file system you want to format the drive as under the Format option. Now select Erase again. The OS will format the drive with the options you selected, and obliterate all data on it.
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Naming the option Erase makes it obvious that the process deletes your data, but this adds confusion in another way. The tips in the above sections are general, so they should work across most external drives.
On macOS, you can only read disks in this format, not write to them. This will prevent you from adding, changing, or deleting files. This lets you add write access to Seagate drives on macOS without having to reformat.
You can also opt for third-party software meant to work on any sort of drive. Mac computers are easy to use, for the most part. Usually, you just get a quick warning message and things return to normal. But sometimes, something worse will happen. It can also happen if you are switching between using the drive on a Mac and a Windows PC. No matter the reason why, this can be a very frustrating thing to deal with, especially if you have just backed up a large amount of files onto your new drive.
The first thing you will run across when you search for a read-only external hard drive on a Mac is the suggestion to reformat it.