Time Machine Error Code 512

[Sear Sommerfeldt]

Im having a little issue with mounting my external hard drive lately. I've tried quite a few methods in hope of getting it to work again, but so far, no luck. I hope someone can help me solve this issue, or those who have the same problem may also share your insights.

My external hard drive was working fine about a week ago. But one day, I ejected the hard drive and the icon disappeared, so I thought it was safe to unplug it. When I did, it said the hard drive was not properly removed. It still works fine when I use it the next day, but the same thing happened. It said the drive was not properly removed after I ejected the drive, waited for the icon to disappear, and then unplugged the drive. After that, it never works again, and the attached images are the info I got when I tried to mount or run first aid on this drive.

I had this happen 4 TB WD My Passport on Big Sur 11.6.2, the 1 TB partition for my Time Machine didn't come up and mounting gave the "disenter error 49218". Here's what worked for me (at least for now):

I opened Disk Utility and run first aid on it and got an error (com.apple.DiskManagement.disenter error -119930878.) but after I closed it, it continued running and some minutes later, the drive was fixed and I was able to see it in Finder and use it again.

I unplugged an external HDD without ejecting it first, then had error 49218 when trying to mount it. Surprisingly First Aid didn't show any errors, but still I couldn't mount it. Restarting the MacBook helped, it just automounted. I'm on Big Sur.

Ok, I had this same issue and found a fix. However, it's ONLY a fix if you do not care about what is on the external HDD. Open Disk Utility and hit Partition. Change it to APFS (Encrypted). I hit "Apply" and it warned me that all data would be deleted. I said ok. It wiped it and then it automatically mounted and all is well now.

FIXED!I've had trouble accessing my external LaCie time machine drive for a while now and nothing I had found online has helped. Couldn't mount it, erase it or use first aid on it. Would get failed messages non stop.The only solution that has helped I have, fortunately, found was by this guy on youtube, =Z9y1oRYlmh0. Formatting the container within the disk utility to a MAC OS Journaled had worked and I was able to access the partition anew and then restart the time machine.

I'm having the same problem with my MacBook Pro M1 max. I have a 2TB external drive I was using with Time machine backups that I can No longer mount. Even disk utility won't allow the disk to be erased and reformatted. I would have thought that apple would have the solution by now seeing how so many have encountered this problem. can someone please help????

I had the same issue - I plugged in the USB drive and one volume of three on the physical drive wouldn't mount, giving error 49218. MBP mid-2014 with Big Sur 11.6.8. Like some others, restarting my Mac (with the drive still attached - not sure this is relevant) brought them all back.

I have so annoying problem on MyCloud EX2 Ultra.

Since the March, when the macOS (Big Sur 11.2.3) tried to connect the time machine folder, it shows error code 112, claiming that it cannot access the drive.

@AustinForest // Sorry, but I am not able to try your suggestions because the root cause of my case was the conflict (maybe) between macOS with Sophos Antivirus. If the issue happens again, I will test this again.

Unlike other cases, the root cause of my case is the conflict between macOS and Sophos Antivirus. I think it happens since I install the Sophos Antivirus, which I did not consider as the root cause before.

If the issue happens again, I will investigate this matter further.

It now starts backing up, and gets about half to 2/3rds into the backup, and then gives up! It then sits at "Waiting to complete first backup"! If I restart it, it starts "Preparing backup" and gives up after a couple of seconds! This pattern is repeatable!

Create a file .com.apple.TimeMachine.quota.plist as the root user with the following contents, please note the period before the com is important as it makes the file hidden. Once you have created the file make sure to set the permissions with chmod 644 .com.apple.TimeMachine.quota.plist The file below is an example with a quota of 500GB. I tested this and once the time machine created the sparse bundle you can look at the Info.plist inside the bundle to make sure the quota took. This is not a limit for the whole folder rather it's a limit per client. This was done on a OMV 5 machine with a 3tb disk formated BTRFS.

Sorry I didn't have any issues with my virtual doing backups to the test SMB folder I setup. I didn't do anything special just enabled time machine on the share and setup the timemachine on the MacOS VM. Try and delete the folder in OMV and re-create the backup as it may have gotten corrupt.

I know this doesn't answer your question and doesn't solve your SMB problem, but because of those troubles and slow transfer speeds and slow folder refreshing and ...., I decided to use AFP again. AFP works out of the box for me on my M1 MacBook instead of SMB, SMB and MacOS isn't the way to go for me.

In case your Time Machine backup drive is inaccessible, or the backup file is damaged, you can use a Mac data recovery software. Stellar Data Recovery Free Edition for Mac can help you recover any lost or deleted data from your MacBook, Mac mini, or iMac.

Yes, you can fix Time Machine error 45 on macOS that restricts you to back up your Mac. Check the USB or network connection of your backup drive, verify its free storage space, and increase the sleep time of your Mac when it is low to perform the scheduled backup without any error.

A few days ago, Time Machine stopped backing up to my Mac and gave me the message: "Time Machine couldn't complete the back up to 'MacBook Pro.'The backup disk image "macbook pro.sparsebundle" could not be accessed (error 19)."

I can no longer back up to Synology after upgrading to macOS Ventura. Every time I start the backup, Time Machine will sit there for some minutes looking for backup disk, then fail with the error "The backup disk image "/Volumes/SynologyNAS/backup.sparsebundle" could not be accessed (error 112)."

Similar to the users above, you may also be experiencing Time Machine errors 16, 19, or 112. It can happen on local external drives and network drives like Airport Time Capsule, Synology, or WD My Cloud, especially after a recent macOS update.

If Time Machine is unable to access the sparsebundle on your NAS drive when initiating a backup, consider updating the firmware and operating system of the NAS device. Compatibility issues may exist with your current macOS version, especially if you recently upgraded your Mac.

Taking Synology as an example. To update the DiskStation Manager (Sybology's OS), open DSM > Control Panel > Update & Restore, then click Download if a new update is available. To update the firmware, open DSM > Storage Manager, then click HDD/SSD > Action > Firmware Update.

You can also restart the NAS device (unplug it from power, wait for 10 seconds, then plug the power cord back.), your router, or simply disconnect the NAS from the router for a few seconds and then reconnect them to allow Time Machine backups to resume.

A good number of users were able to fix Time Machine error 16/19/112 by uninstalling third-party software Sophos. If you have any antivirus applications, security apps, or VPNs, uninstall them before retrying a Time Machine backup.

It's worth mentioning that simply deleting the app program from the Mac won't remove all traces of it. If you want to fully uninstall the app without digging through every possible folder where the app may save files, use iBoysoft MagicMenu.

Since the backup disk image can't be accessed, it may be helpful to ensure Time Machine has full disk access on your Mac. This way, it has unrestricted access to all files and folders on your system, except those on your exclusion list.

If Time Machine error 19/16/112 persists, consider erasing your backup disk or deleting the problematic shared folder, then setting up Time Machine again. Note that this will delete all the existing backups on your drive.

Jenny is a technical writer at iBoysoft, specializing in computer-related knowledge such as macOS, Windows, hard drives, etc. She's also been producing top-notch articles for other famous technical magazines and websites.

Jessica Shee is a senior tech editor at iBoysoft. Throughout her 4 years of experience, Jessica has written many informative and instructional articles in data recovery, data security, and disk management to help a lot of readers secure their important documents and take the best advantage of their devices.

I'm running macOS Catalina and my Time Machine backs up to a Debian 10 server with NetAtalk and Avahi. Since Mavericks macOS has preferred SMB, and given SMB is marginally faster I decided to switch to using SMB for the Time Machine shares. On a fresh AFP share I can start a new Time Machine backup in System Preferences and it will create a new .sparseimage without complaint.

If I first connect to the share with AFP and do the initial backup, I can then connect with SMB and add subsequent incremental backups without error. I thought maybe a permissions issue, but for debugging purposes I have /usr/local/smb set to 0777 and still get the error.

I encountered the same issue, having my Mac refusing to create the initial sparse bundle files on my samba server. After incorporating the hints on _Samba_to_Work_Better_with_Mac_OS_X it finally started the backup.

Thought I'd post some additional info for people. My currently working smb.conf is as follows. Adding fruit:metadata = stream worked for only a short while for me, so below are the results of hours of additional testing.

Note this is on Debian 10 (Buster) so things like password change command will be different on other distributions. Also note that the order of modules in the setting vfs objects = catia fruit streams_xattr is significant and important.

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