This macOS Sierra data recovery tool have knack of recovering deleted data, lost partitions, Time This option can be used to scan the main hard drive for lost or deleted macOS partition recovery. Finally I think my external hard drive is gone forever. Overtime I connect it to iMac macOS Sierra it. From the time when I updated my mac Mini to OS Sierra, the external hard drive is not mounting (even after trying 3 times). Day one app for mac. However, I can find the external drive in “Disk Utility”. Disk Utility is showing that the external drive is full while in reality half of the drive is empty. Welcome to the TH Community, @bristlee1! I'd recommend you check if your external HDD is recognized in Disk Utility on the Mac. If it is, you can easilyand also fix the permissions issue. If that doesn't help, I'd recommend finding access to another Mac OS X computer and check how the external drive would get recognized there. As soon as you can access your data, make sure you back it up to one more storage location/drive as well. Remember that 'backup' means that you have your data stored in at least two (2) locations. Moving data from your system drive to an external hard drive is not a backup, unless there is already a duplicate of the file on a different drive. Hope this helps. Keep me posted! Did you get an answer for this? I think it has somehow reformatted to NTFS! As the same thing has happened to me! How could it do this with the data on and how can I change it back without taking the dates off! Welcome to the TH Community, @Jacquivm4! It would be really helpful if you share more details about your issue with your Mac OS external HDD. Have you connected the drive to a Windows OS machine recently? I'd also suggest you post some screenshots from your Disk utility and how the external appears there. It would also be a great idea to run the diagnostic test through the Disk Utility. I've shared a tutorial on how to execute this in my previous post to this thread. Driver interwrite mobi for mac. If the hard drive is in, make sure you click on Repair Disk Permissions. If you are able to access your files from another Mac OS computer, make sure you back them up! This is the surest way to avoid any potential data loss. If you say that it got reformatted to NTFS, then check how the external appears on a Windows PC/laptop. Give it a shot and let me know how it goes. Did you get an answer for this? I think it has somehow reformatted to NTFS! As the same thing has happened to me! How could it do this with the data on and how can I change it back without taking the dates off! Welcome to the TH Community, @Jacquivm4! It would be really helpful if you share more details about your issue with your Mac OS external HDD. Have you connected the drive to a Windows OS machine recently? I'd also suggest you post some screenshots from your Disk utility and how the external appears there. It would also be a great idea to run the diagnostic test through the Disk Utility. I've shared a tutorial on how to execute this in my previous post to this thread. If the hard drive is in, make sure you click on Repair Disk Permissions. If you are able to access your files from another Mac OS computer, make sure you back them up! This is the surest way to avoid any potential data loss. If you say that it got reformatted to NTFS, then check how the external appears on a Windows PC/laptop. Give it a shot and let me know how it goes. For the record this has also happened to my External Seagate 4T drive on Mac OS Sierra. Fortunately for me I have only just bought it and have no critical data on it. It formatted ok (Mac extended journaled) then I started copying files from another drive and it only got so far when it hit the 'can't write to this disk because it is read only' error. I checked permissions and noticed Read & Write was set ok for admin but 'everyone' was only on Read. I tried to change that setting but it just wouldn't let me, I guess because it couldn't write to the disk. So I hooked up the drive to another machine with Yosetime and it worked fine, passed the verify disk test and allowed me to copy anything to it. It also let me change permissions on 'everyone'. So then back to Sierra and worked for a short time then reverted back to the same old error.
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