Yes, you can use the WD My Book on your iMac with Mojave 10.14.3. The WD My Book comes formatted for Windows operating system and requires reformatting for Mac operating systems. To know how to reformat the drive on Mojave Mac OS you can refer to the link below: support.wdc.com. Just got the WD MyBook 2TB. It's not the one specifically for Mac. It says it is compatible, needs to reformat. How easy is it to reformat?

When I bought the WD My Passport Ultra drive, I was surprised to see that it didn’t support OS X out of the box. Yes, it had some software specifically made for OS X on it, but even that didn’t help. Turns out, it just wasn’t in the right format. These hard drives are customized to run well on Windows (as you’d expect), and they don’t run well with OS X.

So to get it running, what we’ll need to do is format it in Journaled format, which is OS X only format or MS-DOS (FAT), which means it will run with both OS X and Windows. If you’re only going to be using the hard drive on a Mac, I recommend you stick with Journaled.

Why You Need to Re-Format the External Hard Drive

When I first got the hard drive, I wasn’t able to copy anything over to it (but I was able to copy from it). Disk Utility showed that it was formatted to MS-DOS (FAT) but I’m pretty sure it would have been NTFS instead. If you experience the same issue, your only recourse is to reformat it in one of two formats.

If you’re only going to use the external hard drive with Macs or you want to use it for Time Machine backups, format it in Mac OS Extended (Journaled). If you’re like me who also needs to use at least a part of the hard drive from Windows PCs, you’ll need to choose MS-DOS (FAT) format. But here you won’t get great support for Time Machine. Plus you can’t make partitions bigger than 2 TB or move files larger than 4 GB around.

How to Re-Format the External Hard Drive

First, connect the external hard drive, bring up Spotlight Search by using the keyboard shortcut Cmd + Space and type in Disk Utility. Press Enter and Disk Utility will launch. You can also find it in Utilities folder in Applications.

Now, from the left column select 1 TB WD My Passport (or whatever your hard drive name is), and click on the Erase tab.

From here, in Format, select Mac OS Extended (Journaled), give it a name if you want, and click Erase.

You’ll get a warning. Again, click Erase.

In a couple of seconds, you’ll have an OS X ready hard drive to go.

Related: Check out our Ultimate Guide to OS X Yosemite.

How to Create Partitions

I’m planning on using my hard drive for both Time Machine backups and to carry media files around. I might need to use the hard drive with Windows computers so I’m going to format one of the partitions as MS-DOS (FAT), fully aware of its limitations. The other one, for Time Machine backups, will be in Mac OS Extended (Journaled) format.

To create a partition, select the hard drive from the left column and click the Partition tab.

From the drop-down below Partition Layout, select the number of partitions you want. Don’t go overboard here.

Now, just below, you’ll see a visual representation of the partitions. You can use the breakpoint to change the size of the partitions by moving it up or down. You can also click on a partition, give it a name and select the format.

Once you’ve decided all the details, simply click the Apply button. From the pop-up, select Partition.

Disk Utility: Check out the two tips for using Disk Utility and 8 ways to free up space on your Mac.

What Do You Use It For?

What are you planning on doing with the external hard drive? Time Machine backups perhaps? Or just storing media? Share with us in our forums section.

Also See#backup #hard disk

Did You Know

The first Internet Service Provider (ISP) was a company called CompuServe

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Summary: This guide introduces three common scenarios in which you might find your WD My Passport external hard drive read-only on Mac. If the WD My Passport read-only on Mac problem is caused by the NTFS file system, installing iBoysoft NTFS for Mac to edit, rename, delete the saved files and transfer files to the read-only WD My passport hard drive.

Western Digital is one of the most popular hard drive manufacturers. Its product line covers WD My Passport, WD My Passport Ultra, WD My Book, WD My Passport for Mac and more. Among those external hard drive categories, WD My Passport external hard drives are the most widely used ones. However, many users complain their WD My Passport is read-only on Mac like the user below in WD community.

'I have a WD My Passport 320GB external hard drive that I am trying to hook up to my iMac for the first time. I'm running macOS 10.13. I'm extremely frustrated because this drive is in a read-only mode, and I can't figure out how to change it! Any suggestion to fix this?'

--A user from WD Community

If you are looking for solutions for solving read-only WD My Passport on Mac problem, you have come to the right place. This post will explain three common reasons why your WD My Passport is not writable and corresponding fixes.

Why is the WD My Passport read-only?

Sometimes, the WD external hard drive is read-only on Mac when you just got a brand new WD external hard drive. In other times, it suddenly became read-only after you have been using it for a while. The most common reasons for a read-only WD external hard drive, like WD My Passport, are listed below:

• Your WD My Passport hard drive is NTFS-formatted.
• You have read-only permission to access the WD My Passport hard drive.
• Your WD My Passport hard drive is corrupted.

If you are not sure which reason has caused your WD My Passport external hard drive read-only on Mac, check the scenarios one by one. If you know the reason already, you can jump to the scenario that best describes your situation.

Scenario 1: Your WD My Passport hard drive is NTFS-formatted

By default, macOS can mount a Windows NTFS volume or drive in read-only mode. You can view the files saved on the NTFS-formatted partition or drive but can't make any changes to them. In addition, the WD My Passport hard drive won't let you add any files to it. To check if your WD My Passport is NTFS formatted, follow the steps:

1. Go to Finder > Applications > Utilities > Disk Utilities.
2. Click the WD My Passport (you may have changed its name) at the left sidebar. The file system information will be displayed on the right.

Note: You can also right-click the disk icon at the desktop and choose 'Get Info' to check the file system information.

After having confirmed that the WD My Passport is formatted with NTFS, many people will choose to convert NTFS to APFS (for macOS Catalina, Mojave and High Sierra) or reformat the WD My Passport hard drive to make the WD external hard drive compatible with Mac. In fact, installing an NTFS for Mac driver is a much easier way.

Solution: Install an NTFS for Mac driver to make WD My Passport writable

We will introduce an NTFS for macOS drivers - iBoysoft NTFS for Mac. It can help read and write to NTFS-formatted WD My Passport drives on Mac.

iBoysoft NTFS for Mac: NTFS for Mac driver and more

iBoysoft NTFS for Mac is an NTFS disk management tool. It can manage NTFS drives with NTFS write support. It can easily and effectively mount NTFS drive on Mac automatically in read-write mode. It works with macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8.

Three simple steps to read and write to NTFS-formatted WD My Passport drive easily.

Step 1: Download, install and launch iBoysoft NTFS for Mac on your Mac.

Step 2: Connect the NTFS-formatted WD My Passport drive to Mac.

Step 3: Write to NTFS-formatted WD My Passport drive after the drive has been mounted successfully.

Besides an NTFS mounter, iBoysoft NTFS for Mac can also open, unmount, eject, erase and repair NTFS volumes. It can list all attached external disks including USB flash drives, SD cards, memory sticks, external hard drives and so on. You can open them with one click. Moreover, you can reformat them to NTFS with iBoysoft NTFS for Mac if you need.

Scenario 2: You have read-only permission to access the WD My Passport hard drive

If your WD My Passport external hard drive is not formatted with NTFS but you have no write permission to it, it is probably because you have read-only permission to access the WD My Passport. Since your WD external hard drive is write-protected, all your write access is denied.

To know your permission to the WD My Passport, follow the steps below:

1. Right-click the WD My Passport disk icon at the desktop and choose 'Get Info'.
2. Check the information at the bottom under the Sharing & Permissions tab.

If you can see the message 'You can only read', then you will understand why you can't write to your WD My Passport drive.

Solution: Change read-only permission on the WD My Passport drive

Follow the instruction below to change permission on the WD My Passport on Mac:

Step 1: Click on the lock icon at the right corner in the Get Info window.

Step 2: Enter password if asked.

Step 3: Check the 'Ignore ownership on this volume'.

Step 4: Click on the gear button and choose 'Apply to enclosed items…'.

Step 5: Click 'OK' when you are asked to confirm the operation.

Step 6: Click the 'Read Only' in Privilege column and select 'Read & Write'.

By now, you have regained the read and write access to the WD My Passport.

Scenario 3: Your WD My Passport hard drive is corrupted

If you are sure that the read-only WD My Passport is not caused by NTFS file system nor read-only permission, another possible cause might be the disk corruption. When an external drive is corrupted, people suddenly have trouble reading or/and writing to the disk. Then you will have to fix the corrupted WD My Passport external hard drive to make it writable again. We will introduce two solutions here:

• Fix the read-only WD My Passport in Disk Utility on Mac
• Reformat the WD My Passport on Mac

Solution 1: Fix the read-only WD My Passport in Disk Utility on Mac

This solution might help you solve the read-only external hard drive problem without formatting. You will utilize a built-in tool on Mac called Disk Utility. It is used to manage internal and external disks on Mac. There is a function called First Aid in Disk Utility that can be used to check for and repair errors on the selected disk or volume.

Here is how to fix the read-only WD My Passport in Disk Utility:

Step 1: Go to Finder > Applications > Utilities > Disk Utility.

Step 2: Select the WD My Passport drive at the left sidebar.

Step 3: Click on First Aid and click on 'Run' to repair the WD My Passport drive.

Step 4: Click 'Done' after the operation completes.

If First Aid fails to repair the WD external hard drive, your disk might be seriously corrupted. You will have to reformat the WD My passport to make it not read-only.

Solution 2: Reformat the WD My Passport on Mac

Reformatting the corrupted disk is the ultimate solution for fixing the read-only WD My Passport drive. Follow the steps below to know how to make the WD My Passport compatible with Mac and PC. Sparkchess download.

Step 1: Make sure you have a copy of your important files on WD My Passport hard drive, or recover lost data from the external hard drive with iBoysoft Mac Data Recovery.

Step 2: Go to Finder > Applications > Utilities > Disk Utility.

Step 3: Click on the WD My Passport drive at the left sidebar.

Step 4: Check Click 'Erase' on the top of the Disk Utility window.

Step 5: Input a name.

Step 6: Choose FAT or exFAT as format for convenience because either of them is compatible with both Windows and macOS. Of course, you can choose another file system that best meets your needs.

Step 7: Choose 'GUID Partition Map' as Scheme.

Step 8: Click on 'Erase' button.

You can reconnect the WD external hard drive to Mac again to see if it is writable now.

Conclusion

The external hard drive read-only on Mac problem doesn't happen to WD external hard drives only. It is quite common to see other notable external hard drive brand get the same complaint like Seagate, Samsung, Toshiba, etc. When you come across the read-only disk problem on Mac, the post is always helpful.