Couldn t read partition map 69876. : (-69874) Operation failed… I can read both drives from a VM with Windows in the same Mac, from another laptop with Windows, and even from another Mac with macOS Monterrey (but it shows as read-only). Jul 30, 2021 · Couldn't read partition map. Please see Lost storage space on my mac for possible recovery methods. Mac's first aid showed that the partition map had is. You also can use Mac data recovery software to recover data from corrupted or erased drives on Mac. Operation failed. Cant use free space. This is the info I get: Volume type : Physical Device BSD device node : disk4 Jan 10, 2024 · When erasing the Disk, it says: Unmounting disk Couldn’t open device. Sep 29, 2021 · As it turns out, a lot of affected users that were also dealing with this issue on macOS have managed to fix the issue by using Disk Utility to create a new partition map by forcing the utility to show all devices and erasing the problematic partition. Couldn’t modify partition map. Jan 12, 2025 · Here is the guide to fix partition map errors on Mac. Feb 4, 2026 · Solutions to fix 'Problems were found with the partition map which might prevent booting' on Disk Utility when checking and repairing an internal or external hard drive. But to avoid important data loss, you should perform data recovery first. I'm trying to create it back but this message appears: Partition failed with the error: Couldn’t modify partition map because file system verification failed. Learn how to fix a corrupted or damaged partition map without losing data. : (-69874)' is causing lots of Mac users frustration. Couldn't read partition map (-69876) Support Community Feb 3, 2026 · How to solve the damaged partition map error? Since Disk Utility can't repair the damaged partition map, you can only format the drive to replace the damaged partition map. Feb 3, 2026 · How to solve the damaged partition map error? Since Disk Utility can't repair the damaged partition map, you can only format the drive to replace the damaged partition map. Here's what it means, its causes, and how to fix it. Sorry for the inconvenience. This is the info I get: Volume type : Physical Device BSD device node : disk4 Apr 7, 2012 · 2 I deleted my Bootcamp partition from Disk Utility by accident. I had this issue and couldn't resolve it this way because I had a 4gb swap drive (ubuntu linux) that needed to be turned off before disk utility could remove it. Here are the result of the command: gpt -r show disk0 and diskutil list. TestDisk is a free and open source data recovery software tool designed to recover lost partition and unerase deleted files. " I have a 512 GB disk with 120 GB dedicated to Bootcamp and the rest is Will the Disk mount in your friend's macOS? Try to avoid attempting to repair the Disk in Disk Utility, although rare it can causes issues when attempting to recover data. Oct 23, 2025 · The 'couldn't modify partition map. Mar 13, 2023 · Now that you are aware of every scenario that might trigger the Couldn’t modify partition map error, here’s a list of methods that might allow you to fix it: Method 1: Creating a New Partition Map As it turns out, a lot of affected users that were also dealing with this issue on macOS have managed to fix the issue by using Disk Utility to create a new partition map by forcing the utility BC Assistant has reduced the OS X volume, but failed to create the BC/Windows part. If more information is needed, please tell me. Step 1: Recover lost data after partition map damage Feb 21, 2023 · Partition map errors are tricky but solvable with the right tools. If the disk mounts, try this: You can try some software level data recovery like Disk Drill or if the Disk is formatted as macOS Extended you can use Disk Warrior. Couldn’t unmount disk. Jan 19, 2026 · The "Couldn't modify partition map (-69874)" is a partition map problem that usually happens when you are partitioning or formatting the hard disk, and this error is usually caused by a file system verification failure. Dec 16, 2019 · Partition map issues external WD SSD exfat drive, how can I re-add EFI partition? this week , partial data disappeared on this external drive . Step 1: Recover lost data after partition map damage Aug 5, 2025 · If you're getting the "Couldn't Modify Partition Map" error, this article shows you 3 ways to fix it plus a way to keep your data intact. Nov 13, 2023 · Fixing damaged partition map. Then I tried to partition it with Mac OS Extended (Journaled) with it named Macintosh HD and it says: The volume “Recovery” on disk1s3 couldn’t be unmounted because it is in use by process 0 (kernel). I couldn't get the text to another computer, so it's an screenshot. Feb 13, 2013 · Hi I am currently trying to install Yosemite and I wanted to partition my Macintosh HD but I get the error: "Partition failed with error: Couldn't modify partition map because file system verification failed. disk0 and disk1 is the internal SSD. nweud bvxh ufpa udwbjhh twdr jmnbgn wtebndh yfhd scgpbdt eamnby