Open the Disk Utility app and highlight your external hard drive. If you select the one below it, the Partition option will be greyed out and become unclickable. Located on the left is a big blue circle with the name of your external drive together with its volume size. Then allocate the desired volume to each partition. You can do that by clicking the small white circle and dragging it around.
To check whether the operation is really successful, go to your Mac desktop.
You should see multiple disk icons show up. I chose to create two partitions on my Seagate Expansion — one for backup, the other for personal use. That wraps up this tutorial article. I hope you find it helpful. As always, let me know if you have any issues during the formatting or partitioning process. I can follow this to the letter until the partition section. I have a Seagate 1 TB external hard drive, but have already backed up my Mac once, so the Partition button is always grayed out. Same problem with partition greyed out on I can only select either one but partition icon is grey.
How to Recover from External Hard Drive Read-Only Error on Mac
Your email address will not be published. When I connected the Seagate to my Mac, the drive icon showed up like this. Step 1: Open Disk Utility.
That drive for Mac should work out of the box with no formatting required. It might work.
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Hi, many thanks for all this great info. The hard drive powers up normally with no weird noises and has a continue white light no flashing and as far as I can see all is normal. But for some reason, it is not showing up in Disk Utility, Terminal or Console. Thanks for getting back to me. If you have quick access to another Mac, I would try connecting the drive and see if another Mac picks up the drive using System Report or elsewhere. Close all apps 2. Shut down the Mac 3. Once powered off, connect the drive and if available, connect the drive to its own power source 4. Power up the Mac 5.
Case 2: Access permissions on Seagate external hard drive are not ignored
Remember to try multiple ports on the Mac—just in case there is a problem with a port. If the problem replicates on another Mac, then the problem is likely some hardware issue in the drive itself—perhaps a loose cable or some other issue. Hello, I read this article, you described so deeply. If disk already mounted and system goes to sleep, it also powers down ports, including USB ports. It is very bad when you need to transfer something right then. It can be risk that on the external drives which means you cannot transfer what you need between devices at all.
I did not know why this happen then I searched and found that it happens because multiple reasons like faulty cable, damage USB port, file system corruption, and so on. One more point, I would like to share about data recovery software. During research I found that there are software available online that are very helpful if some lost data during this update, they can recover easily. I read reviews and most of them suggested Stellar Data Recovery. I used free demo to check and found better result.
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But, I am wonder to read this blog because of you described a so many tips or solutions to fix it which I did not know. Very useful article for me I personally believe. Thank you so much. I knew the drive and cable were okay. A reboot would always fix, but who wants to do that every few days?! It is the first one which talked about what I am sure is my issue, namely power and recognizing external disks with a port expander.
But now with my new Mac Pro connected through the new Thunderbolt connector, not all of the disks mount when I turn the computer on. Unplugging the various disks and reconnecting them eventually gets them all to work, but there is no procedure I have worked out that reliably gets them all to mount.
If anyone who has experienced this problem has found a permanent solution I would be interested, even if I need to buy a different port expander. We suggest you check out this Apple Shop page where they list the hubs they sell and recommend for Macs. I see it grayed out in Utilities and I just need to know if I try to mount it there will I lose my files? What we do suggest is purchasing or borrowing an external drive that does work with your new MacBook Pro and then duplicating those important files onto that drive using your older MacBook.
Since Yosemite includes AirDrop, you could also try airdropping those files to your newer MacBook—this should work. All went well. Even after trying all your steps.
What Does It Mean When a Hard Drive Is Locked on Your Mac?
Strange thing is when it does show under USB3. When I first moved my photo library, all was well and it did open from the external LaCie, right after moving it. I purchased an adapter so that I could plug in my external hard drive. The drive lights up but is never recognized on the new mac. My last MacBook with relevant ports had no issues recognizing this hard drive last week. When you plug in the adapter, it should click in—not be loose. You can even go to an Apple Store and ask them to connect your drive to a Mac to test its functioning.
Inserting the external hard drive cable slowly into the macbook worked for me too. Quite Strange….
Seagate Backup Plus Desktop Read-Only on Second Mac
However, if Mac has been only logged out rather than shut down, then at Login the drive is detected but not mounted you can see it listed in Disk Utility but greyed out. At this point it responds to a manual re-mount and then functions as expected; but it used to work properly.
It seems that something has inadvertently happened while browsing or I have accidentally clicked on something affecting system setup. In trying to solve this problem I resorted to resetting the hard drive, doing a full-Time Machine backup from scratch and then full encryption.
I suspect a corrupted keychain access or a background app Malwarebytes? There was a big in High Sierra back in that impacted mounting some external drives. Some readers found that updating to macOS Mojave solved any problems with mounting external drives. You should also run Apple Diagnostics to see if there is any hardware issue at play. Restart your Mac and press and hold the D key on your keyboard.
Keep holding that D key until you see a screen asking you to choose your language, the release. One of my external drives decided was not going to show up on my Mac.