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Apart from the bad block(s), the file system can also get corrupt due to computer virus, illegal system file manipulation, and improper formatting of the drive. When the zeroth block of a storage drive, which stores its file system turns bad due to usage, macOS Catalina can’t mount the drive.
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In case of accidental formatting of USB external storage drive, use a software to do data recovery on Mac. But before that, back up the USB drive to avoid any data loss. When you need cross-compatibility of a file system between Windows and Mac, format your USB drive to exFAT. Also, the OS won’t read or write EXT 2/3/4 (the format used in Linux). It can read NTFS (the proprietary format of Windows) but denies any write operation. macOS Catalina supports APFS, HFS+, HFS, FAT32, and exFAT. But, you can see the drive greyed out in Disk Utility. If you are connecting an incompatible storage drive to your Mac, the drive won’t be visible in Desktop or Finder. Check the file system format of the Drive For a visual cue, check the LED indicator of the storage drive. Even try changing the USB cable or hub to ensure there is no problem in the wiring. So, reconnect the drive snugly to the USB port or try a compatible one.
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If the power source is connected and turned ON or is not required as in case of portable external drive, then ensure that USB connectivity is fine. A bigger drive may need an external power source. But due to a connection problem, the storage drive may not show up there. Generally, when you connect an external storage drive to your Mac, it will show up in Desktop, Finder, and Disk Utility. Try out the following fixes to resolve some of the common reasons for hard drive not mounting issue on macOS Catalina: 1.
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Incompatible driver software of the storage driveįix Can’t Mount External Hard Drive on Mac.Corrupt file system of the storage drive.
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Incompatible file system format of the drive.Faulty connection with external storage drive.Go through the following list for plausible reasons behind external storage drive not mounting on macOS Catalina: You would need to analyze the root-cause to fix the ‘drive not-mounting’ issue. It can be due to other factors that prevent your macOS from reading the drive normally. The trouble may not always be with the new operating system that you’ve recently installed. Thanks.”Įxternal storage drive not mounting on macOS is not a new issue. Please suggest if there’s a way to mount my drive and access the data. I’ve stored my treasured family photos and videos on the drive, which I don’t want to lose. When I connect my external hard drive to the Mac, the drive is not mounting. “Hi, after upgrading my Mac to Apple’s latest macOS Catalina 10.15, I’m facing a problem. : External Hard Drive Not Mounting on macOS Catalina 10.15