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Don't apply this update if you use Paragon or Tuxera software to have read/write access to NTFS-formatted drives, as it breaks the software. If you uninstall the software, you rgain read-only access, which is baked into the mac os.
The update also prevevents XDCAM discs from mounting on the desktop when used with an XDCAM reader/writer. The XDCAM Drive Utility reports the disc to be in a perpetual state of "unmounting".
Sony has not responded. Paragon did, and said that it will require a further Apple update to resolve the issue. I've reported both to Apple, but... yeah. Who would think a security update would cause so mush trouble?
If you have installed the security update and lost NTFS read/write access, Paragon suggested this workaround to me:
sudo mkdir /Volumes/ntfs
diskutil list
sudo /Library/Filesystems/ufsd_NTFS.fs/Contents/Resources/mount_ufsd_NTFS /dev/diskXsY /Volumes/ntfs
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Unfortunately the workaround proposed by Paragon doesn't seem to work, at least not for all scenarios. I can access the files on my NTFS-formatted (internal) Boot camp partition, but not write to it or boot from it. (Windows 10 Home is installed, and updated.) A few weeks ago I uninstalled Parallels Desktop so I don't know whether there's any issues with that as well, but my guess is that Parallels wont work on NTFS-formatted partitions either. (Should work on Parallels Desktop's virtual drives though, but that's another matter.)
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iBoysoft NTFS for Mac V4.2 Upgrade:
Fix NTFS drive not mounted on macOS 10.15.7 after security update !
https://iboysoft.com/ntfs-for-mac/
Works fine 👍On My new hard drives ( Seagate 1Tb )or flash drives i use exFAT.
I have NTFS only on my old drives
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https://www.send2press.com/wire/solved-ntfs-hard-drive-wont-mount-on-macos-10-15-7-after-security-up...
https://iboysoft.com/ntfs-for-mac/
Works perfect 👍