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Most of the time, when you plug a Samsung T3, Crucial, Sony or Sandisk SSD into your MacBook or Mac Mini, it will be mounted in Disk Utility. However, sometimes, an external or internal SSD won't mount on Mac. It can be so frustrating if your Mac doesn't detect the SSD, especially when you need to transfer something right then.
Don't worry, this passage will troubleshoot SSD not mounting on Mac issue.
Sep 16, 2018 The SAMSUNG EVO 860 SSD is currently the most popular SSd on the market, and for good reason! In this video, i demonstrate how i fixed a 2011 Macbook pro by installing a Samsung EVO 860 SSD. Oct 22, 2019 Samsung X5 500GB SSD. Not to be confused with the Samsung T5 that I have mentioned in other posts, the Samsung’s X5 is the Thunderbolt 3 SSD model and highly rated by Mac.
Important: Back up important files
One essential thing you should know is that SSD data recovery is more difficult than hard drive data recovery. This is because SSDs use a new technology called TRIM. So when your SSD still won't mount due to disk corruption, your data stored on the SSD is so fragile and any operation will overwrite the original data.
In this situation, if you have important data on the drive, we suggest you back up files from the unmountable SSD first. As a free and professional data recovery tool,iBoysoft Data Recovery for Mac is highly recommended. It can recover lost data from unreadable SSD, recover lost data from formatted SSD, unmountable SSD, corrupted SSD, etc.
Aside from that, iBoysoft Data Recovery for Mac can also recover lost data from unreadable USB flash drive, hard drive, external hard drive, SD card, etc. on macOS 10.15/10.14/10.13/10.12 and 10.11/10.10/10.9/10.8/10.7.
Tutorial to recover lost data from unmountable SSD on Mac with iBoysoft Data Recovery for Mac
Step 1: Launch iBoysoft Data Recovery for Mac.
Step 2: Select the unmountable SSD and click 'Scan' to search for lost files on the drive.
Step 3: Preview the scanning results, choose files we need, and click 'Recover' to get them back.
Step 4: Have a check to ensure we have got all lost files back.
Troubleshooting SSD not mounting issue on Mac
After you rescue files from the unmountable SSD, you can then fix the 'SSD no mounting' issue on Mac without worrying about data loss. Let's start with basic solutions.
1. Check the cable. Try connecting the same device with a different cable.
2. Check whether the SATA and USB port are damaged. If you've got another port or another SSD case, try connecting the device to that one.
3. Reboot your computer. Sometimes, an SSD is not mounting, there are problems with macOS system. Fortunately, some damages can be easily fixed by restarting. So restart your Mac computer to see if the SSD is mounted.
Solution 1: Mount SSD in Disk Utility
When an SSD won't mount, you can force mount it in Disk Utility at the very beginning. Launch Applications > Utilities > Disk Utility (or just search Spotlight for it). Disk Utility will list all connected disks as long as the disk is detected, with mounted or unmounted partitions listed below. If the SSD shows up in the list but one of partitions is not mounted, you can right-click the partition and choose Mount button.
Solution 2: Power cycle the drive
If you can't mount the SSD in Disk Utility or the SSD is not showing up in Disk Utility, restarting your Mac might help. It's called power cycle and you can have a try when Disk Utility doesn't see your SSD.
Step 1: Start your system, hold the OPTION key and let it sit there for 30 minutes.
Step 2: After the 30 minutes shut down the computer and wait 30 seconds.
Step 3: Turn the system back on and hold the OPTION key again and wait another 30 minutes.
After these steps are complete then you can try the SSD again to see if it will be mounted in Disk Utility.
Solution 3: Repair SSD with Disk Utility
If your SSD is still not mounting, it might be failed due to disk errors or corruption. You can try selecting First Aid to repair the disk.
Step 1: Go to /Applications/Utilities/Disk Utility/, then click Continue.
Step 2: In the sidebar, select the SSD that is not recognized.
Step 3: Click the First Aid button.
Step 4: Click Run.
If Disk Utility tells you the disk is about to fail, back up your data as soon and as much as possible, and then replace the disk. Disk Utility can't repair the disk in the SSD disk enclosure.
Solution 4: Fix SSD not mounting on Mac by erasing
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The last hope to fix the unmountable SSD is to reformat it, as reformatting will restructure this disk to fix corruption. However, it will remove all data on the SSD as well. Hence, you need to first back up useful files with iBoysoft Data Recovery to prevent further data loss.
Here is how to reformat the corrupted SSD.
Step 1: Launch Disk Utility.
Step 2: Select the unmountable SSD on the left part of the window.
Step 3: Click 'Erase' on the top of the Disk Utility window.
Step 4: Complete related information (name, format, scheme), then click Erase.
If the SSD is still not detected on Mac, the drive might be physically damaged. You should send the drive to local technicians for reparation or replace it with a new one.
Bonus Part: How to mount SSD in the right way
For some reason like lack of space and frozen system, you bought a new Sandisk extreme or other portable SSD. But you just don't know how to mount it on your Mac to make it work. If you are facing such problems, this part will assistant you to mount the SSD easily.
How to mount a new external SSD on Mac?
- Connect the new SSD to your Mac. You need to prepare a USB-C to USB 3.0 adapter if you want to use the SSD on the latest models of MacBook Pro or MacBook Air. Then plug the SSD into the USB-C hub of your MacBook to continue. Moreover, you need to buy a disk enclosure to hold the SSD if the manufacturer doesn't give you one.
- Open Disk Utility. The external SSD will be detected by Mac and then show it in Disk Utility, which can confirm if the SSD has any hardware problem or not.
- Erase to mount the SSD. A new SSD might not be verified and initialized at first. So, you need to format and partition the SSD in Disk Utility before you can use it on Mac. Go to Disk Utility > Select the SSD > Click on Erase tab > Name the SSD > Select a Format > Select a Scheme > Choose Erase button.
Then, the external SSD will be automatically mounted by the Mac, waiting for you to transfer content to and from your external SSD. Every time you finish your work on the SSD, you need to right-click the external SSD and choose Eject. It's going to unmount the SSD safely, which lowers the possibility of SSD not mounting issue on Mac.
What's more, you may want to fit an SSD internally to upgrade your MacBook Pro or MacBook Air. Its great speed and accessibility could lead you to replace the traditional hard drive. Then, you can also install the SSD to replace your old hard drive, and mount the SSD as a system drive.
Summary: This a full guide to external SSD not recognized on Mac issue, which includes both reasons and solutions to this issue, as well as how to recover lost data when external SSD is not showing up on Mac.
You can't access a Sandisk, Crucial, or Samsung T3 when the external SSD is not recognized or detected by Mac, whether the external SSD was working for a long time or it's a new SSD you bought recently. However, this issue is so prone to happen even when you unplug the external SSD from the Mac and later on plug in the SSD again. It's definitely frustrating, especially when you have important files stored on it.
How can you fix the unrecognized external SSD and access your files stored on it? You will find the answer and troubleshoot this problem in this post.
Why is external SSD not recognized on Mac?
Various reasons are leading to external SSD not showing up issue on Mac. Here we conclude four main causes as below:
1. The SATA to USB 3.0 adapter/Dock is malfunctioned.
Usually, you need to buy an additional dock, disk case, or SATA adapter to access an SSD drive. During this process, if the externally connected SSD is not recognized by your Mac, it's likely that the adapter is not compatible with the disk's SATA interface, or the dock/drive caddy is faulty.
2. The external SSD is new and uninitialized.
This happens when users externally connect the SSD to backup or transfer files on the internal hard drive. But many newly bought SSDs are not initialized with a file system, which means there is no entrance for macOS to recognize and communicate with this SSD, and for sure, the external SSD won't show up.
3. The external SSD has a file system that can't be recognized by Mac.
Possibly, the SSD that you try to access is formatted with a file system. However, it's not a file system that your Mac can recognize. For example, it is formatted with a Linux file system. In this case, your macOS can't recognize the external SSD surely.
4. New software or firmware needs to be updated.
This happens frequently for Samsung portable SSD T5/T3, because you need to install Samsung portable SSD Software to unlock disk's password and update certain firmware for this SSD. And if the necessary software and extension are not downloaded, you may receive 'No Samsung portable SSD is connected' from its software.
5. The external SSD is not set to show up on Mac.
Sometimes, your external SSD actually is recognized by the Mac, but some setups stop the SSD from showing up in the Finder, on the desktop, or even in the Disk Utility.
6. The external SSD is corrupted.
Another possible cause is that you have unsafely ejected your SSD, which makes the external drive corrupted after some core data like partition table or file system is damaged. Also, you need to be clear that the life span of an SSD is limited depending on how frequently you use it.
7. Other Hardware problems.
How to fix external SSD not recognized on Mac?
Solution 1: Check whether the external SSD is properly plugged in
Since all SSDs use SATA interface, so when an external SSD is not recognized by Mac, the first and foremost solution is to check whether the external SSD is properly plugged in. So simply do these checks:
- Check if the cable is working by connecting the external SSD with a different cable.
- Check whether your SSD is using SATA Ⅰ, Ⅱ, or Ⅲ so that your adapter/dock/case is compatible with your external SSD.
- Try a different SATA to USB adapter and make sure it works by plugging in a different drive.
- Try to connect the external SSD directly to your Mac if it's a type C drive, rather than accessing it via a USB-C adapter.
Tips: If the unrecognized external SSD is a Samsung T5/T3 SSD, and you got the 'System Extension Blocked' and 'No Samsung Portable SSD is connected' messages when executing Samsung Portable SSD Software, simply go to System Preferences > Security & Privacy > choose Allow button next to the message: System software from developer 'Samsung Electronics' was blocked from loading.
Solution 2: Reboot your Mac computer
Sometimes, Mac externalSSD not mounting issue is caused by the system issues. But you easily fix them by restarting. The restarting process will refresh your macOS's memory and starts it up fresh, which works efficiently especially when the USB port is busy. Simply choose the Apple menu and click Restart.
If you are interested in, you can learn what happened inside when Mac doesn't recognize an external drive with details.
Solution 3: Find the unrecognized external SSD in Disk Utility
When an external SSD is not showing up on Mac, the most necessary step is to check whether the external SSD can be found in Disk Utility. If the external SSD can be found in Disk Utility, you make sure that the drive doesn't have any hardware problems. But if you can't find it listed in Disk Utility, the external SSD might be physically damaged.
So simply Go > Disk Utility > View > Show All Devices to check the external SSD.
- If your external SSD is using Windows NTFS format, macOS won't mount the drive in writable mode. To write to an NTFS drive, you need to download a free NTFS for Mac driver.
- If you have used this external SSD on other computers for some time and now it is unrecognized by macOS, the file system of the SSD is either unsupportable or corrupted, you need to recover lost data from this external SSD and reformat the drive.
- If you newly bought this SSD and it is not initialized, you can't see the partitions of the external SSD in Disk Utility but receive an error message 'the disk you inserted was not readable by this computer'. In this case, you need to make sure you don't have any data on this drive and then initialize it in Disk Utility by erasing.
![Samsung Samsung](https://elite-computers-llc.com/wp-content/uploads/2017/09/PC-Desktop-Repairs.jpg)
Solution 4: Repair the unrecognized external SSD with First Aid
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If your external SSD shows up in Disk Utility but not mounted, you can right-click the drive and select Mount menu and then the SSD will show up on Mac. If the Mount button is grayed out or you fail to mount the external SSD, try running First Aid to verify and repair disk errors.
Step 1: Launch Disk Utility.
Step 2: Choose the grayed out external SSD from the left sidebar.
Step 3: Select the 'First Aid' tab on the top.
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Solution 5: Reformat the unrecognized external SSD without data loss
If all solutions above don't work, the external SSD might be corrupted and you need to reformat it. The thing is, reformat will cause data loss. But actually, whether the external SSD is not recognized due to logical disk errors or hardware problems, the most important thing is your files on the drive. So, to prevent data loss, you need to get your files off this external SSD first if you forget to back up. Hopefully, you can recover lost data from the external SSD with the help of professional Mac data recovery software.
iBoysoft Data Recovery for Mac is highly recommended here to recover lost data from unrecognized external SSD. It's a free and professional data recovery tool, which can recover lost data from corrupted, formatted, unreadable, and unmountable SSD. This software works on macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.
Moreover, iBoysoft Data Recovery for Mac supports main storage devices including hard drives, external hard drives, USB flash drives, SD cards, memory cards, etc. and multiple file formats such as documents, audios, pictures, videos, emails, etc.
Tutorial to recover lost data from unrecognized SSD on Mac with iBoysoft Data Recovery for Mac
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Step 1: Launch iBoysoft Data Recovery for Mac.
Step 2: Select the unrecognized external SSD and click 'Next' to scan lost files on the drive.
Step 3: Preview the scanning results, choose files we need, and click 'Recover' to get lost files back from the unrecognized external SSD.
Step 4: Have a check to ensure we have recovered all lost files.
After your important data is recovered, you can go ahead to fix this issue by reformatting without data loss.
Tutorial to reformat the unrecognized external SSD
This operation will remove all data on the external SSD, please make sure you have recovered all useful files with iBoysoft Data Recovery.
Step 1: Launch Disk Utility.
Step 2: Select the external SSD on the left part of the window.
Step 3: Click 'Erase' on the top of the Disk Utility window.
Step 4: Complete related information (name, format, scheme), then click Erase.
Solution 6: Send the external SSD to a local technician for help
If unfortunately, the external SSD can't show up in Disk Utility or the solutions above failed to fix external SSD not recognized issue, the drive might have some hardware problems. You need to contact the manufacturer for technical support or product replacement.
Some SSD support pages you may need:
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- Samsung: https://www.samsung.com/semiconductor/minisite/ssd/support/warranty/
- Crucial: https://uk.crucial.com/gbr/en/support?cm_re=top-nav-v2-_-flyout-support-_-support-home
- Intel:https://supporttickets.intel.com/?lang=en-US
- WD: https://www.westerndigital.com/support
- Kingston: https://www.kingston.com/en/company/warranty
- Toshiba: https://www.toshiba-memory.com/warranty/