After upgrading from OS X Sierra to OS X High Sierra on my MacBook Air, I can no longer mount and read my external hard drive. During the upgrade, I converted my MacBook hard drive to APFS. My external drive is formatted as Mac OS Extended.
Posted by Katrina to Mac Data Recovery on October 29th, 2018
How to Format an External Drive for Mac Compatibility. This is a simple procedure and is achieved the same way for all drive types and through all connections, be they USB, Firewire, or Thunderbolt. Formatting a drive will erase all data and partitions on the disk: Connect the hard drive or USB key to the Mac. Skip to main content. Try Prime All. Amazon.com: external disk drive mac. Skip to main content. Try Prime All Go Search EN Hello, Sign in Account & Lists Sign in Account & Lists Orders Try Prime.
Is the data on my external drive inaccessible now that I have APFS on my computer? Or is there a way to access it?
When you connect your external hard drive on Mac, if everything is working fine, the operating system will automatically recognize the device and mount its data in the Finder application. However, just like the above example, it may happen that the external hard drive is invisible on the left side menu of Finder and unmounted when checking in Disk Utility. Can't mount an external hard drive on Mac? This post will show you feasible solutions.
Mounting issues on Mac
There are numerous reasons forexternal drive not mounting issue, and below listed are few common ones:
Unable to mount external hard drive on Mac, how to fix?
The following are three effective solutions to external hard drives won't mount on Mac. But before running these steps, please do some basic checks.
Quick fixes of external hard drive not mounting on Mac:
1. Check whether the disk is properly connected to the system and powered on if required.
2. Try a different USB cable to make sure it is not at fault.
3. Try a different port/hub or plug another device in to see if the port/hub works. If you are sure that there is no problem with the USB port/hub, you can plug a working external drive in a port/on a hub, unmount and eject it. Then plug the unmountable external hard drive into that port/hub.
Winbox.exe for mac. 4. Check the file system of the external hard drive. Sometimes when the drive is formatted with NTFS, it can't be mounted on Mac. By default, macOS only enables NTFS drive read support but disables write support. In this case, you can mount external hard drive with the help offree NTFS driver for macOS.
Still unable to mount the external hard drive on Mac? There might be problems with the drive itself, but you still have ways to resolve it.
Back up at first
Since you can't access the external hard drive, all files stored on the drive are lost. In this situation, if you have important files on the external hard drive, any operation on the drive will overwrite the original data, resulting in irreparable data loss. So it's highly recommended to make a backup firstly. Forget to back up before?iBoysoft Mac Data Recovery can help yourecover lost data from the unmountable external hard drive.
iBoysoft Mac Data Recovery is afree external hard drive data recovery tool that enables you to recover data from external drive which is unmounted, formatted, inaccessible, unreadable, or corrupted. It's fully compatible with macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7. It supports data recovery from hard drive, external hard drive, USB flash drive, SD card, memory card, pen drive, etc.
Tutorial to recover data from unmountable external drive on Mac with iBoysoft Mac Data Recovery
Step 1: Download and install iBoysoft Mac Data Recovery on Mac.
Step 2: Launch iBoysoft Mac Data Recovery.
Step 3: Select the unmountable external drive drive and click 'Next' button to scan all lost data.
Step 4: Preview the searching results, choose files we need, and click 'Recover' to get them back.
Step 5: Have a check to ensure we have got all lost data back.
Solution 1: Repair the external hard drive with Disk Utility
Step 1: Launch Disk Utility.
Step 2: Choose the unmountable external drive on the left sidebar.
Step 3: Select First Aid in the top center and click Run.
Solution 2: Repair the external hard drive with Terminal
Sometimes, Disk Utility may not function as desired. But you can still repair the corrupted external hard drive with Terminal.
Step 1: Go to Applications > Terminal
Step 2: Enter: diskutil list (This will list out the available volumes).
Step 3: Check the volume identifier from the table that appears.
Step 4: Enter:diskutil repairVolume [diskvolume identifier]. For example, if the volume identifier of external hard drive is disk2s, you should enterdiskutil repairVolume disk2s.
Solution 3: Reformat the external hard drive
If yourexternal hard drive can't be repaired with Disk Utility and Terminal, the drive might be seriously corrupted. The only way is to reformat it. Reformatting will erase all data on the external hard drive, please make sure you have backed up important data.
1. Launch Disk Utility from Utilities.
2. Click the icon of the unmountable external drive on the left part of the window.
3. Click the Erase function on the top of the Disk Utility window.
4. Complete the related information (name, format, scheme), then click Erase button.
Still have questions?
BestExternal Hard Drives for MaciMore2019
When it comes to storing data, personal information, and essential documents, you can never be too safe. External hard drives are not only useful for storing data but are an excellent way to transport files from one location to another. When you take into account price, ease of use, and portability, the Seagate Backup Plus Slim is the most reliable hard drive you can carry around with you at all times.
Best Overall: Seagate Backup Plus Slim (2 TB)
If you want a reliable external hard drive that has a decent amount of storage, is super easy to carry around and has a very affordable price tag, the Seagate Backup Plus Slim is the best option for most people. Formatted for Windows and Mac right out of the box, it's easy to carry all your essential documents from desktop to laptop without missing a beat.
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The Seagate Dashboard back up system is a fantastic simple tool that can let you schedule backups to ensure you never miss any critical files you need in case something terrible happens to your computer. You can set automatic backups daily, weekly, or monthly, and change the frequency whenever you want.
Seagate also throws in a one-year complimentary subscription to Mylio Create. This can help you wrangle your photo library if you don't already use some photo managing tool, and a two-month membership to Adobe Creative Cloud Photography Plan.
Pros:
Best OverallSeagate Backup Plus Slim (2 TB)
Reliable, portable, and affordable.
Don't worry about lengthy setups or formatting procedures. Plug in the Seagate Backup Plus Slim 2TB which is formatted for Mac right out of the packaging.
Best USB-C hard drive: Samsung T5 Portable SSD (1 TB)
This small compact SSD drive from Samsung comes with both a USB-C to USB-C cable and a USB-C to USB-A, meaning it's perfect to use with your MacBook or Mac.
Its fast 540 MB/s read and write speeds are more than enough to transfer any file. And should be able to store all your photo and video files with ease thanks to its straightforward software. Plus, if you're worried about encryption, the Samsung T5 Portable SSD has you covered with an optional password to launch the drive, and AES 256-bit hardware encryption on all your files.
Pros:
Best USB-CSamsung T5 Portable SSD (1 TB)
Create windows 10 bootable usb on mac for pc. Fast and encrypted
With 540 MB/s read and write speeds the Samsung T5 Portable SSD is fast enough for photographers and videographers to transport all their work.
Compatible with Time Machine right out of the box, the 8 TB storage capacity on the Western Digital My Book is perfect for people looking for a lot of stage at a reasonable price. It's USB 3.0 meaning it's easy to take advantage of its storage speed with fast transfer speeds.
While portability is not the Western Digital My Book's strong suit and it needs a separate power source, it does offer 256-AES encryption when you download its easy-to-use security software. It ensures all your important files and documents stay private.
If you're looking for a drive that has lots of space, os you don't have to have multiple as your storage needs grow, look no further. https://actionever828.weebly.com/mac-g5-for-sale.html.
Pros:
Best CapacityWestern Digital My Book (8TB)
Lots of storage for those who need it
Western Digital offers 256-AES encryption when you download its security software, meaning you can rest easy knowing your private information and personal data is safe.
Best Thunderbolt 3 Drive: LaCie Rugged Thunderbolt
LaCie hard drives have always been good for people on the go because of the rugged design. The LaCie Rugged Thunderbolt can withstand some dust, dirt, and even a tiny bit of water being splashed on it.
It's 7200 RPM Hard drive keeps things running smoothly. And the included USB-C cable — which supports Thunderbolt 3 — makes it perfect for MacBook and Mac users alike!
Cons:
Best Thunderbolt 3 DriveLaCie Rugged Thunderbolt
Rugged design with Thunderbolt 3
The LaCie Rugged Thunderbolt 3 is a favorite because it can withstand drops, dust, and even the occasional splash of water, making it easy to carry around!
Best for Legacy Hardware : G-Technology G-DRIVE USB 3.0 (4TB)
While Apple has been going the way of USB-C and Thunderbolt 3 for a while now, some of us still use older hardware and thus don't need hard drives that have USB-C connections. If you're still rocking USB-A or even a Thunderbolt 2 connection from your Mac, the G-Technology G-DRIVE USB 3.0 (4TB) is a perfect companion.
Its all-metal design is not only more durable than plastic hard drives, but it also looks stylish! Plus, it's 7200 RPM speed allows the G-Technology G-DRIVE USB 3.0 to achieve 195 MB/s read and write speeds. This makes it fast enough to transfer large video files quickly and efficiently.
Cons:
Best for legacy hardwareG-Technology G-DRIVE USB 3.0 (4TB)External Disk Drive For Macbook Air
Stylish and fast even on older computers
With 7200 RPM, this hard drive works hard and fast to get your files transferred quickly. Plus, it uses USB 3.0, and it even has a Thunderbolt 2 port.
The CalDigit Tuff does the best it can to live up to its name, giving you a hard drive that isn't as delicate as most. Its official IP rating is IP57, meaning it can be submerged in 3-feet of water for 30 mins and come out the other side functional. That's not all; this Thunderbolt 3 compatible drive can also withstand falling from about 4-feet high. We still don't suggest that you purposely abuse the CalDigit Tuff. Still, it's always good to have peace of mind when you're carrying your hard drive around.
Cons:
Best rugged driveCalDigit Tuff
Can withstand drops and water
Official rated IP57, the CalDigit Tuff can survive an accidental dip into the water and has a great price tag.
If you're used to dealing with giant file sizes and need a hard drive that can handle transfer data fast, the Samsung X5 is one of the fastest SSD's you'll find. Its read and write speeds are 2,800MB/s and 2,300MB/s respectively, and the entire body is made of metal, making it much harder than plastic drives. Plus, The internal frame on the inside is shock resistant for drops from 2 meters.
This SSD comes with Thunderbolt 3 technology included. This you can take advantage of the fast speeds on your Mac or MacBook Pro, and it doesn't need any formatting, so it's plug and play!
Pros:
Best fast driveMac External Cd Dvd DriveSamsung X5
Incredibly fast SSD
If you need blazing fast speeds for giant files, the Samsung X5 is a monster external SSD that can handle any workload.
Bottom line
The Seagate Backup Plus Slim is the most reliable hard drive you can carry around with you at all times. It is formatted for both Mac and Windows right out of the box, and its easy-to-use software can automatically do backups for you as often or as little as you want.
Seagate also throws in a one-year complimentary subscription to Mylio Create. This program can help you wrangle your photo library if you don't already use some photo managing tool. A two-month membership to Adobe's Creative Cloud Photography Plan means it's perfect for budding photographers as well.
Credits — The team that worked on this guide
Luke Filipowicz is an iMore staff writer who has been carrying around his Seagate Backup Plus Slim since his college days.
Lory Gil is the Managing Editor of iMore and an avid believer in having as many backups of your important files and documents as possible.
Rene Ritchie is the foremost authority on all things Apple and has insider knowledge about the goings-on at the biggest tech company in the world. When it comes to accessories for Mac, Rene has used them all.
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