single user mode fsck external hard drive

Here's what I would like to do (in single-user mode): 1. You may have to run it 3-4 times. Step 3: Wait for the message: File system was modified to appear, execute the command: fsck -fy again. View Mounted Disks and Verify Disk Location. #2. I tried to list my drives with the Terminal command df -hl The specificied disk was not in the list When I tried the suggested tail command tail -f /var/log/fsck_hfs.log I saw the name of the disk as /dev/rdisk3s2: ** The volume could not be verified completely. Restart your Mac. No. Step 1: Shut down or restart your Mac system, and as soon as the boot process begins, press Command +S until you see white texts on a black background, that means we enter the single user mode. b) For non-boot or external volume, open the Terminal app from Dock. But make sure to backup it before you erase the drive. The name of the drive we want to mount (what do we call it?) Mounting drives in single user mode: http://www.insanelymac.com/forum/index.php?showtopic=232365How Pixar almost deleted Toy Story 2 with rm * :http://www.yo. You'll need to reboot into Single User mode, which is a stripped-down, text-only, superuser interface for macOS. Run sudo fsck_exfat -d <id from above>. The only advantage in using fsck or calling fsck_apfs direct is in the other options available. Start the Mac computer, press and hold Command+R as the computer starts After entering the Single User Mode, you will see a white text which will appear on the screen To start the file system check, type the fsck -fy and hit enter Restart your Mac and hold down Command + S keys to boot your Mac into Single User Mode. Restart Mac and hold "Command+S" into the Single User Mode. We recommend using an external hard drive or USB stick to prevent overwriting recoverable data. To access this mode, press and hold Command and S immediately after hearing the startup . Way 2: Repair Mac Hard Disk in Single User Mode Besides Disk Utility in Mac recovery boot, there is also a built-in disk diagnostic and repair program called fsck or file system consistency check, which could verify the current startup disk and repair it. For older Mac, as soon as you hear the startup sound, press and hold both the command key and S key, which will boot your system into single-user mode. My external ext3 USB drive was mounted while my system crashed while I was messing around with a LiveCD. 2:- Using FSCK in single user mode. 2. fsck.ext3: Bad magic number in super-block while trying to open /dev/sdd. Click the icon for your external hard drive in the sidebar on the left. this assumes that the USB drive is formatted HFS+. I tried "sudo tune2fs -c 1 /dev/sdc1" on the USB drive and mounted and unmounted it with no success. Okay so I dropped my MacBook (older model) running OS X 10.4 and when I try to turn it on it will only load in single user mode. Even if the drive is completely unformatted, Disk. Use Single User Mode to repair hard drive. (Copying large files into your live user's home folder while booted from a LiveCD is a bad idea by the way. The easiest way to find the right volume to mount is booting in single user mode without the usb external drive attached to your machine. 1. 2. Run Single User Mode using the command 'fsck', which performs a file system check. In the single-user mode, type /sbin/fsck -fy command to fix the boot volume corruption. The repair steps are as follows: Start or restart the Mac, then immediately press and hold Command + S keys. Then to get out of Single-User mode just type the word: reboot . Plus you could use your startup OS X installation disk and run Disk Utility (found in the menu items right before the final install process) on it. disk0s2), press Enter to start the checking and repairing. Run df to view a list of currently mounted disks. Few things to try, download disarbitrator with the drive unplugged, set it to active in "read only" see if the drive appears. When you run either the command tool fsck or the First Aid action in Disk Utility on an APFS volume, they simply call on the tool fsck_apfs to perform the work. The disk is read-only in single-user mode. The mount command is required as your hard drive is mounted as read-only, by default. Release the keys once you see white text. Step 2: Type in the command: fsck -fy in the single-user mode. Alternatively, you can search for Terminal by Spotlight in the menu bar. ubuntu@ubuntu:~$ sudo fsck.ext3 -pv /dev/sdd. Let me know if this doesn't work. fsck is used to check and optionally repair one or more Linux file systems. 3. First we need to enter Single User Mode. First, create a backup and then shut down your computer. With a new hard drive installed I was able to set everything back to the way it was. 2. When I boot it for the first time, it boots just fine, but forces an FSCK on the next boot. I'd been led to believe that fsck was s significantly more powerful UNIX style disk troubleshooting app, whereas Disk Utility is much more basic. Following that, I used this command (also suggested in the above link) Run the command a second time. Boot the system into single -user mode; you'll be logged in as root. Try fixing the troubled Mac storage drive's corrupt file system using the file system consistency check (fsck) command in Single User mode. You will be asked if you wish to have your / filesystem remounted. Step 4. Run some launchctl commands The command executes a thorough check of the system. If any of this scares you, stop now and ask somebody for help. If the incorrect file size occurs for other files you should rerun First Aid to see if they have been fixed. This results in the Mac getting successful in recovery mode. I found this hint and used it from another mac with the MBP in firewire target mode. Step 3: When the 'File system was modified' message appeared, then . The most efficient method might be to boot the Mac into Single User Mode and use the fsck command - a shortcut to launch the file system check feature. Again thanks you. To leave single-user mode and continue booting, type exit and /sbin/mount -uw / /usr/sbin/diskutil repairPermissions / /usr/sbin/diskutil list fsck -fy mount -uw / The fsck command takes a while to run, maybe 5 or 10 minutes, although that will vary depending on the size and speed of the drive. Enter the command line: /sbin/fsck_file system -fy /dev/drive identifier (e.g. You can release the keys once you see white text start to appear on the startup screen. sudo fsck -M /dev/sdb. 1. eg sudo fsck_exfat -d disk1s3. Now run this command - ls /dev/disk* Follow the steps mentioned below: Press and hold the Command + S keys as soon as the Starts and release them when you seethe text like-Mac boots in the Single User mode. Click on the "Partition" tab. Besides Disk Utility, Single User mode can also help you perform Mac hard disk repair on your iMac, Mac mini, or MacBook. My system AMD64 quad cores is damaged following a of Gnome halted, I made a reset since I have many hard drive errors, Gnome does not start anymore, I made the startup menu the single user with the Option 6: 1 / acpi on, 2 / safe mode on, 3 / single user on, 4 / verbose on. #3. 3. usual, but instead of starting all the system processes, only a single root shell will be provided. This is how single user mode works - when it stops, run the commands listed below to analyze your Mac startup disk. :)). 1y. A corrupted hard drive is an inevitable part of owning a computer, whether it's a MacBook or a Windows machine. If you want to always start up your Mac with Single User Mode, you need to utilize Terminal to make it. Select Linux Recovery Mode. Enter "/sbin/fsck -fy"and press enter to start a system file check. Don't plug in the USB drive. Your Mac will run a diagnostic on your internal drive, and attempt to repair any damage it finds. When you see the initial boot menu, select "Boot FreeBSD in single user mode" (option 4). The mount command is necessary because your hard drive is mounted read-only by default, so this re-mounts it in read/write mode. You can find instructions in the Rocket Yard Guide Safe Mode & Single-User Mode: What They Are, How to Use Them. Fsck. 1y. In case your Mac does not reboot, use File System Consistency Check (FSCK) command to repair the startup drive. I have the command / bin / sh :, I have the prompt "#". Run diskutil list and check the name of the volume listed under IDENTIFIER - it'll be something like disk3s4, for example.. Use that name to run fsck.You can also pass the -f option to force checking a clean filesystem.. sudo fsck /dev/disk3s4 fsck has shorthands for diverse file system types: If I boot in single-user mode and forcefully tell FSCK to rebuild the FS, then the following happens: A lot of 'invalid node' errors appear; fsck restarts a couple of times; after one of the iterations it's getting abort()'ed In single user mode, start by running fsck /sbin/fsck -fy repeat until you get "The volume <name of your hard drive> appears to be OK". How to mount USB or external drive in Single User Mode on Mac? If the device is valid and it really contains an ext2. Type this command: /sbin/fsck_hfs -fy /dev/[partition number] . /sbin/fsck_hfs -fy /dev/disk2 You need to replace 'hfs' with the true file system of your external hard drive as well as replace the drive identifier with the one you just located in step 3. Steps to repair Mac external hard drive by using single-user mode are as follows: Start or restart your Mac then promptly press and hold Command + S keys. Aside from having to spend for a new drive, the worst part of a corrupted hard drive is data loss - users commonly lose access to the data on those drives once it gets corrupted. Use Single User Mode to repair hard drive. This time, fsck checks the disk and reports it as clean, or with errors. Boot your Mac in SU mode by holding "Command+S" keys combination during startup. Copy various files and/or directories from my HD to the external USB drive (UNIX cp command) Check the message provided by the fsck command. If your Mac says that the file system was modified, the FSCK command found and repaired the issue. In the next menu select " fsck ". When launching single-user mode, you will see commands scrolling on the screen. Boot into Single-UserMode and perform fsck -fy and keep running it until it says "** The volume (name_of_volume) appears to be OK". . Don't plug in the USB drive. To access this mode, press and hold Command and S immediately after hearing the startup . While sdb is mounted, the tool exits without running a check. Select fsck Utility. Now run these commands. Boot the system into single -user mode; you'll be logged in as root. I entered single user mode, and used the fsck -fy command, it repairs a few problems, but theres always this one problem that it can't seem to fix ever, it always takes 3 tries to fix it and fails. To try this, follow the given steps: In order to boot your Mac in the single user mode, press and hold Cmd and S during the boot process. Wait for a few seconds until you see the last line written as "Localhost: root#". Fsck. Safe Mode: This is a special booting method that forces your Mac to perform an automatic disk check and repair as it tries to start up. They're often used to troubleshoot issues a Mac may be experiencing or to assist in isolating and repairing some common issues that can keep a Mac from starting up correctly, or that make it act strangely when it's in use.. Solution 3: Execute FSCK Command. Step 1: Open Terminal, type diskutil list and hit on Enter You want the id under the IDENTIFIER column, it should look like disk1s1. Mount an external USB drive (250 GB already formatted as Mac OS X Extended) 2. A Mac in need of hard drive resetting. In Single User Mode, it is possible to unmount the internal hard drive and manage it directly, perfect if the issue you are experiencing is with the Mac local system . Again thanks you. I had a problem on my MacBook Pro hard drive with an invalid sibling link and catalog errors. First, create a backup and then shut down your computer. it's says "incorrect number of thread records (4, 33991)" Enough is enough, i tried booting into the install disc again, and format the drive, no luck. if this doesn't work then i am at a complete loss maybe using an external disc drive via a USB might solve the problem but i am unsure. You can use fdisk or df command to list the hard drive in Linux. From the connected drives with partition details, note the corrupt disk or partition identification number, say /dev/disk2 or /dev/disk2s2. mount -uw / The fsck command will take a while to run. B. FSCK. Single User Mode Window Type the following on your keyboard: /sbin/fsck -fy Then press the Return key. 1. Try to Use fsck in Single User Mode Performing the system in recovery mode fixes most of the times. Launch Disk Utility. Boot into Single-user mode. fsck: Repair Mac File System in Single User Mode Perhaps at the end of the "First Aid" for the Mac hard drive you will be suggested to put the Mac into recovery mode with cmd + R when restarting. The FSCK however fails. Follow the steps - Open your Mac and then press & hold Command + S . Disk Utility repair wouldn't work, single user fsck didn't work, Disk Warrior, Tech Tool Pro and Drive Genius wouldn't repair it. If they still show as an error, try starting your Mac in single-user mode, and running fsck. During the boot, hold down the shift key so that the grub menu is shown. Some people use single-user mode to run the Unix fsck utility, although it's easier to boot into Safe Mode or run Disk Utility from Recovery for that purpose. This boots the Mac in single user mode that responds to text-mode terminals. That's all!!!!! So, worst case scenario: you end up with a non-bootable clone which preserves these key items. 1. The FSCK method needs to be performed in single-user mode. Take the Mac hard drive reformatting as the last step because this formatting process will erase all data on the drive. Connect the external hard drive to your Mac system with the help of a digital cable. Installer discs for the software you wish to restore. Step 1: Restart your Mac, and then press and hold the Command + S keys during the startup to enter Single User Mode which will provide you with a text-mode terminal. Let me know if this doesn't work. On the prompt, type fsck_hfs -y /dev/disk4s1 and hit Return. Step 1. It is the default status. mount -uw / The fsck command will take a while to run. Input the following command into the Terminal window: sudo nvram boot-args="-s" and hit the Return key. Step 2: Type the command /sbin/fsck -fy. See if that helps repair the drive. A Mac personal computer has a feature called Single User Mode; this is very similar to the Recovery Mode on a Linux Distribution and to some extent, similar to Windows Safe Mode. #1. TIP: maybe because this post is a few years old on my system I needed to mount /dev/disk1s2. Then, we unmount sdb and run the same command again. Make sure you've backed up your hard drive with Time Machine or some third-party Mac backup software. Your Mac boots into single-user mode. It may take some time, depending on the condition of your drive, how big it is, and how full it is. Step 2: Then, type in 'fsck -fy' command when entering the Single User Mode. Hold down Command + S while your computer restarts. The two modes are distinctly different, with safe mode being a . How to use Single User Mode and fsck to repair a disk Boot the Mac into Single User Mode by holding down Command+S during system boot after you hear the boot chime, you know you will have successfully entered Single User Mode because you will see a bunch of white text on a black background scroll by In most circumstances, it is therefore simpler and just as effective to use Disk Utility . Disk Utility is unable to repair this at first, but the fix is this: Use diskutil list to find the right drive id. macOS Mojave or later operating systems don't have this mode enabled. So please do not do it. Open Launchpad > Other Folder, and select the Terminal application. Then FSCK will start to scan and . In order to run fsck on an external drive, you first need to find out the identifier of the drive. For legit Mac users I think you hold Apple and s key as you boot. Once fsck completes, if you see a "File system was modified" message, then you should then run "fsck -fy" again until you see a message stating "The volume (name) appears to be OK" - this is standard procedure of using fsck. Step 1: Restart your Mac device, and when the boot process starts, press Command + S until the white text appears in the background. :)). Type "/sbin/fsck_hfs -fy /dev/[drive identifier]" and press "Return". The easiest way to find the right volume to mount is booting in single user mode without the usb external drive attached to your machine. Doing so will fix the issues if any. /dev/sdd: The superblock could not be read or does not describe a correct ext2. #4. The fsck command follows a pattern similar to most Linux commands. Specify a name for the new partition, select a filesystem type (Mac OS Extended Journaled is default), and choose a size either by manually entering a capacity or by dragging the slider bar in . Type diskutil list and press Return. Boot to single user mode (cmd + s on start) Mount the failing hdd /sbin/mount -uw / Exit single user mode by typing "exit" at prompt (Not sure if this step is necessary.) Repair damaged Mac hard drive by running FSCK command: Firstly, you need to reboot the Mac system into Single-User mode to repair corrupt Mac partition using the FSCK command. Few things to try, download disarbitrator with the drive unplugged, set it to active in "read only" see if the drive appears. Anyway, how can I run a filesystem check on the disk? Let go off the keys when you see a black screen with white text scrolling. So you have to change it by typing in the command: /sbin/mount-uw/ Step 4: After the work is done, type reboot to exit single-user mode. Running fsck on a mounted filesystem can usually result in disk / data corruption. By default, the target disk in Single User mode is read-only, thus, you need to change that: type /sbin/mount -uw /. fsck [options] [filesystem] If you do not specify a filesystem, the system will analyze your fstab file ( /etc/fstab) for the devices to scan. Step 2. Restart your Mac and boot into Single User mode. fsck -fy. The folder we are going to mount the drive in. Some white text will scroll by quickly. Even when your Mac has a firmware password, this mode won't load. Now run these commands. A little bit of Mac know-how—we'll be digging into Disk Utility to erase the hard drive, single user mode, and root access. As with using Terminal from Recovery, single-user mode is useful mostly if you're already comfortable in Unix. The kernel will boot up as. I tried "sudo tune2fs -c 1 /dev/sdc1" on the USB drive and mounted and unmounted it with no success. FSCK should be able to fix this issue. Solution 2: Reformat the Drive Now run this command - ls /dev/disk* TIP: maybe because this post is a few years old on my system I needed to mount /dev/disk1s2. . Hopefully, it can be bootable too. Make sure the external drive is working correctly to carry out the whole process smoothly. filesystem. In this tutorial, we are looking at how you can use the Single User Mode to repair the hard drive of any Imac that has power but only boots too a grey screen. Type the command /sbin/fsck - fy . 2. Restart the Mac to enter single-user mode. Note: To remove the first title line of the fsck tool " fsck from util-linux 2.31.1 " use the -T option. Repair Drive Using FSCK Command in Single User Mode. 1. You will need to run the command either as root user or use it with sudo. I ran fsck until it came back and said "appears OK" so then I entered reboot and it still loads in single user mode but then says IOBluetoothHCIController::start Idle Timer Stopped I tried to put in my OS X software CD and hit "C" key but it makes a really . My external ext3 USB drive was mounted while my system crashed while I was messing around with a LiveCD. Select the hard disk you want to partition from the left side of the app. For Chameleon-type hackintosh bootloaders, hit any key then type -s enter. Open the Apple menu and select "Restart." 2. Then choose " Recovery mode ". Grub Advance Options. Reboot your machine: # reboot. The mount command is required as your hard drive is mounted as read-only, by default. You have two choices (a) Take down system to single user mode and unmout system i hae tried holding down c during start up and going into single user mode fsck -y -f but that doesn't fix the problem but it does show that i have overlapped extent allocton in the catalog file which may . Select the " Advanced options ". The most efficient method might be to boot the Mac into Single User Mode and use the fsck command - a shortcut to launch the file system check feature. Instead, you should restart your Mac (or turn it off and on again), but then cmd + p Hold down (⌘ + S). Now at OS X Recovery, click on disk utility-> choose the drive or the partition and then click on first aid button. Type "reboot" then press enter, to leave Single User Mode and boot . In Single User mode, run the file system consistency check (fsck) command to fix the corrupt file system on the troubled Mac storage drive. Press the on/off button once. The type of file system that drive uses. But if it didn't help, check the next solution. If you are using Rescue Mode, the disk you want to check should not be listed: df -h. Use fdisk to view disk locations: fdisk -l. Copy the location of the target disk to use with the fsck command. Click on the + button to add a new partition. The identifier in the last column represents the number of all external devices, remember the number of the external hard drive you want to repair. Single User mode in Mac OS can fix startup disk issues using FSCK command. Steps to Repair External Disk Using FSCK under Single-User Mode Step 1. But you can ignore that. Anyway, how can I run a filesystem check on the disk? In case you are unable to fix the hard drive corruption using Disk Utility, continue reading the further section. Single User Mode (fsck): This is another special startup method that allows you to run command line utilities, such as fsck, which can verify and repair hard drives. Do not run fsck on a live or mounted file system. 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