3 Ways to Fix Mac Mount Failure Error 77 without Data Loss

Encountering the "mount: / failed with 77" error on your Mac can be an obstacle, especially when trying to access crucial data. Fear not, as we'll provide you with three effective methods to resolve this issue while ensuring your valuable data remains unaffected.

We will discuss three effective methods to resolve the “mount failed with 77” error:

How do I recover data from a hard drive with Error 77?

When you encounter the “Error 77” message while trying to mount a disk and access the data stored on it, the Mac Data Recovery Wizard offers an easy way to get to your data with just a few clicks! The utility can recover data from an unmounted external hard drive, including photos, videos, documents, and more.

When you come across mount errors like “Error 77,” “Disk Unmount Failed: (-69888),” and the common unmount issue “com.apple.DiskManagement.disenter error,” this tool quickly scans for recoverable data. Download this powerful hard drive recovery software and follow the steps below to recover your hard drive when you get the “Error 77” message:

Step 1: Launch the Data Recovery Utility, select the unmounted volume, and click “Search for Lost Files.”

Step 2: The powerful software will deeply scan all recoverable data from the unmounted hard drive. Check the boxes of the files you want.

Click “Recover” to restore files from the unmountable external hard drive and choose a secure location on your Mac to save them.

3 Ways to Fix Mac Install Failed Error 77

After recovering data from an unmountable hard drive to prevent permanent data loss, here are 3 effective ways to fix error 77:

Fix 1: Check the USB Port/Cable and Re-Insert the Disk Make sure your USB port isn't damaged, and the cable is properly connected. Sometimes, simply unplugging and reinserting the USB drive can solve the issue. Test the USB device on another computer to see if the problem persists. If it works fine on other computers, the issue might be with the USB port on your original computer. If the USB device isn't recognized on all computers, then the device itself could be faulty.

Sometimes, the issue might be with the USB port or cable. Try these steps:

Step 1: Disconnect the external disk from your Mac.

Step 2: Check the USB port for obvious damage or debris.

Step 3: If you're using an external USB hub, connect the drive directly to your Mac to rule out a problem with the hub.

Step 5: Push the drive firmly back into the USB port.

After reinserting the disk, check if it was successfully mounted. If not, proceed to the next troubleshooting step.

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Solution 2: Force Mount the Disk via Terminal On a Mac, sometimes it's necessary to force mount a disk using the command line interface. Here's how to do it through Terminal: 1. Open "Applications" > "Utilities" > "Terminal." 2. In the Terminal window, enter the following command, replacing `/path/to/disk` with the actual path of your disk, for example `/dev/disk2`, and ` /path/to/mount/point` with the location where you want to mount the disk, such as `/Volumes/MyDisk`: ```bash sudo mount -t apfs -o norecovery /path/to/disk /path/to/mount/point ``` If your disk format is not APFS (Apple File System), replace `apfs` with the appropriate file system type, like `hfs+`. 3. Press Enter, and you'll be prompted to enter your administrator password. After inputting it, Terminal will attempt to mount the disk. 4. If successful, you can check if the disk is mounted by going to "Finder" > "Volumes." Please note that force mounting might lead to data loss or damage, so make sure to back up important data before attempting this. If the disk has issues, professional data recovery services might be required.

If the disk still won't mount after trying different USB ports and cables, you can try to force mount an external hard drive from the Terminal.

Step 1: Open the Terminal. You can find it in Applications > Utilities.

Step 2: Type the following command: diskutil list. This will display a list of all the disks connected to your computer.

Step 3: Identify the drive you want to connect to. It will usually be labeled something like /dev/disk2 or /dev/disk3.

Step 4: Once the drive is recognized, try mounting it manually with the following command:

Replace “diskX” with the name of your disk (for example, disk2 or disk3). When prompted, enter your administrator password, then press Return.

After entering the password, Terminal attempts to mount the disk. When the process is complete, check to see if the disk was successfully mounted.

Solution 3: Reformat the drive to a file system format compatible with macOS

If you see the "Mount Failed with Error Code 77" message on your Mac, it might be due to compatibility issues with macOS. A viable solution is to reformat the disk to a file system format that works well with macOS.

Before you begin formatting, make sure to back up any data saved on the disk. Formatting will erase everything on the disk, so make sure your files are backed up.

If you're unable to access data due to mounting issues like the "com.apple.DiskManagement.disenter error 49244," you can use utility software to recover and back up your files before formatting. The tool provides a data recovery solution that helps retrieve and safeguard your files before you take any measures.

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After backing up your data, format the disk by following these steps:

Step 1: Click on “Applications” > “Utilities” > “Disk Utility.”

Figure 1: Open Disk Utility

< b > Step 3: < /b > Click the “Erase” button at the top of the Disk Utility window.

Step 4. Choose the file system format required for your disk. For compatibility with macOS, select either HFS+, APFS, or Mac OS Extended format. Name the formatted disk and click the “Erase” button to start the formatting process.

The bottom line?

This article will illustrate 3 effective ways to resolve the “Installation Failed with Error 77” issue and retrieve stored data from uncountable hard drives using a Mac Data Recovery Wizard tool.

"Frequently Asked Questions on 'Mac Mount Failure with Error 77'"

Now that we've discussed some issues regarding installing and detecting drives on a Mac, let's explore the fixes for each situation.

How to Force Mount a Drive in the Mac Terminal? To force mount a drive in the Mac Terminal, you can use the `mount` command or the `diskutil` command. Here's a basic procedure for each: For the `mount` command (if you know the file system type): ```sh sudo mount -t /dev/ / ``` Replace `` with the file system type of the drive (e.g., hfs+, exfat, or ntfs), `` with the path of the device (e.g., `/dev/disk2s1`), and `` with the location where you want to mount the drive (e.g., `/Volumes/MyDrive`). For the `diskutil` command: ```sh diskutil mountDisk /dev/ ``` Again, replace `` with the path of your device. Before running these commands, make sure you have administrator privileges (by using `sudo`) and verify the correct device path. If unsure about the device path, run `diskutil list` to view all available disks and partitions.

First, use the `diskutil list` command to find the disk identifier. Then, unmount the drive with `diskutil unmountDisk /dev/diskX` (replace X with the disk identifier). Finally, remount it forcibly with `sudo mount -rw /dev/diskX`. This should make the drive accessible again within the system.

2. How do I remount my built-in hard drive on my Mac? To remount your Mac's built-in hard drive, follow these steps: 1. Make sure your Mac is turned on and you have administrator privileges. 2. Open "Finder" (Finder). 3. In the sidebar, click on the "Devices" section. If the sidebar isn't visible, press `Command` + `Shift` + `A` to display it. 4. You should see your internal hard drive (usually named "Macintosh HD" or a custom name). If it appears grayed out and unclickable, it may be unmounted. 5. Open the "Applications" folder, then find and open the "Utilities" folder. 6. In "Utilities," double-click to open "Terminal" (Terminal). 7. In the Terminal window, type the following command, then press Enter: ``` diskutil mount /dev/diskX ``` Replace "diskX" in the command with the actual identifier of your built-in hard drive. To find the disk identifier, type the following command in the terminal: ``` diskutil list ``` This will list all disks connected to your Mac and their identifiers. Locate your internal hard drive (usually /dev/disk0 or /dev/disk1) and use its corresponding identifier to replace "diskX" in the previous command. 8. If everything goes well, Terminal will display a message indicating that the hard drive has been successfully mounted. You should now see your hard drive available in the "Devices" section of Finder. Please note that if the hard drive has physical damage or severe errors, this method might not work. In such cases, professional assistance might be required for data recovery or repairing the hard drive.

If you need to remount the internal hard drive on your Mac, follow these steps:

Step 1: Restart your computer into “Recovery Mode”

2. In Recovery Mode, open Disk Utility.

Step 3: Select your internal hard drive, and click the "Mount" button.

Why isn't my Mac detecting my external hard drive?

This could be due to a formatting issue with the drive, a power failure or insufficiency, a damaged cable, or that the drive itself is damaged or malfunctioning. Ensuring the drive is correctly connected and checking your Mac's settings to show external drives should often resolve this issue.