External Drive Wont Mount in macOS

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Use these terminal commands to force mount your external hard drive or flash drive for Could not mount… disk errors in macOS. Often solves mount failed with 72 and mount failed with 71 errors as well. • For expedited help, consider supporting the channel: • https://paypal.me/jonopay • • 1. Run this command to locate the drive you want to mount. Note it's [file system] and [disk number]: • diskutil list • 2. Create a mount point (enter your Mac's admin password): • sudo mkdir /Volumes/mount • 3. Run this command w/info from step 1: • sudo mount -t [file system] /dev/disk[disk number] /Volumes/mount • NOTE: [file system] and disk[disk number] should be replaced with the exact name of the drive you want to mount from step 1. • USE THESE MOUNT COMMANDS BASED ON YOUR FILE SYSTEM • sudo mount -t ntfs /dev/disk[disk number] /Volumes/mount • sudo mount -t apfs /dev/disk[disk number] /Volumes/mount • sudo mount -t exfat /dev/disk[disk number] /Volumes/mount • sudo mount -t hfs+ /dev/disk[disk number] /Volumes/mount • sudo mount -t hfsplus /dev/disk[disk number] /Volumes/mount • sudo mount -t fat32 /dev/disk[disk number] /Volumes/mount • sudo mount -t NFS /dev/disk[disk number] /Volumes/mount • sudo mount -t Btrfs /dev/disk[disk number] /Volumes/mount • sudo mount -t XFS /dev/disk[disk number] /Volumes/mount • sudo mount -t ext2 /dev/disk[disk number] /Volumes/mount • ALTERNATE MOUNT COMMANDS: • sudo diskutil mount disk[disk number] • sudo diskutil mount /dev/disk[disk number] • sudo diskutil mount force /dev/disk[disk number] • sudo mount -t [fileSystem] -o force,rw /dev/disk[disk number] /Volumes/mount • sudo mount -t /dev/disk[disk number] • OTHER HELPFUL COMMANDS: • diskutil verifyDisk /dev/disk[disk number] • diskutil repairDisk /dev/disk[disk number] • CHECK FOR DISK ISSUES: • sudo fsck_[file system] -f /dev/disk[disk number] • GRANT READ/WRITE PERMISSION: • sudo chmod 600 /dev/disk[disk number] • BACKUP TO AN OFFSITE SOLUTION SUCH AS BACKBLAZE: • https://secure.backblaze.com/r/05lue6 • UNMOUNT HARD DRIVE BEFORE UNPLUGGING • Sometimes forcing a drive to unmount is required and it's important to eject or unmount external drives BEFORE physically unplugging them to avoid potential data loss or damage. You can right-click to Eject a drive OR drag and drop the drive's icon onto the trash in macOS. This command will unmount the drive. • diskutil unmount /dev/disk[disk number] • diskutil unmount /Volumes/mount (replace mount with your location) • HOW TO FIND DISK NUMBER FILE SYSTEM IN SYSTEM INFORMATION: • If your disk is plugged into a USB hub/dongle, your device info may appear in Storage in the left nav of About this Mac… More Info… System Report… Storage. You will see FileSystem and BSD Name at the top - use both in the Terminal Commands to mount the disk. BSD Name = disk[disk number]. Alternately, your disk information may appear in Thunderbolt/USB4 or USB, or Card Reader if it is a Compact Flash card. • • THIRD-PARTY HFS+ FILE SYSTEM SOLUTION • You may need to install a third-party hfsplus filesystem driver. One popular option is the osxfuse package, which includes a hfsplus filesystem driver. Note that you'll need to have Homebrew installed to use the brew command. You can install Homebrew by following the instructions at https://brew.sh/. • Terminal Command: • brew install osxfuse • sudo mkdir /Volumes/mount • sudo /usr/local/bin/mount -t hfsplus /dev/disk[number] /Volumes/mount • WHEN ALL ELSE FAILS: • If your disk is unreachable, which is very rare, these commands are a LAST RESORT and will ERASE ALL DATA on the drive and reformat it in the file system you command: • sudo diskutil eraseDisk [fileSystem] [name your disk] /dev/disk[number] • replace [fileSystem] with your preference. • replace [name your disk] with the name you want to assign to your disk • replace [number] with the number supplied by System Report or diskutil list command • sudo diskutil eraseDisk apfs [name your disk] /dev/disk[number] • sudo diskutil eraseDisk hfsplus [name your disk] /dev/disk[number] • sudo diskutil eraseDisk exfat [name your disk] /dev/disk[number] • —————————— • Video Chapters: • —————————— • 00:00 The Problem • 00:30 Step 1: Open System Report • 01:17 Step 2: User Terminal to Make a Directory • 02:04 Step 3: User Terminal Force Mount the Drive • 02:50 Success: Compact Flash Card Mounts • 03:08 Repeat for External Hard Drive • 04:13 Wrapping Up • ANNOTATION • March 12, 2024 • updated useful commands, simplified steps • July 28, 2023 • Additional ways to get disk info in pinned comment • July 15, 2023 • added unmount info • April 05, 2023 • alternate way to find disk info in system report - storage • added chapters • March 28, 2023 • 3rd party file systems with Homebrew • February 27, 2023 • added new commands for finding disk info • January 31, 2023 • added erase commands • January 13, 2023 • added other file systems • added mount failed with 72 and 71 tags

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