Error unmounting filesystem. sudo blkid -c /dev/null. select the faulty disk setting --> repair filesystem. If nothing is using the file systems then it should unmount them all for you although there's nothing wrong with doing a zfs umount -a first. 2. You used rbind to mount a filesystem and submounts. In the event of a system crash, power failure, or other unclean unmount, XFS uses the journal (also called log) to recover the file system. To remove all the processes attached to the device (that are not in use) slowly, you can use this solution. $ umount2: Device or resource busy. 1 ” use the -T option. Detach the filesystem from the filesystem hierarchy now, and cleanup all references to the filesystem as soon as it is not busy anymore. (LINUX) Filesystem umount busy error on Linux server To determine which processes are accessing the file system, use the fuser command in the following form: For example, to list the processes that are accessing a file system mounted to the /media/cdrom/ directory, type: Example 2. Check with: mount | grep <mountpoint>/ For loopback mounts, also check the output of: losetup -la Anonymous inodes (Linux) Anonymous inodes can be created by: Temporary files (open with O_TMPFILE) inotify watches Nov 14, 2020 · Viewed 557 times. This will check if there are any errors, and if so it asks you whether it should fix them. You cannot unmount a file system that is busy. helper is called if one exists. 06:42:25. 9. Mount the filesystem to replay the log, and unmount it before re-running xfs_check. My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts. file hierarchy. Hi, I am using berryboot for a long time and recently upgraded my berryboot image at least i want to. Run the following commands to make an entry in /etc/fstab so that the EFS mount persists on reboot: May 19, 2016 · I am trying to use Ansible to remove /var from /etc/fstab without attempting to unmount the partition, I will use a reboot to make the change take affect : - name: Remove Default /var Mount mount: Oct 29, 2023 · You signed in with another tab or window. Method 1: use lsof. Nov 21, 2023 · In Linux, umount is the command used to unmount a mounted filesystem. The Ext3 File System Expand section "5. sudo addgroup <user> fuse. 0 [Release 11. Aug 23, 2019 · If the file system is in use the umount command will fail to detach the file system. 6100-09 - use AIX APAR IV39905 7100-03 - use AIX APAR IV40079 APAR Information VOLUME IS BUSY One or more applications are blocking the unmount operation. Make sure to set the filesystem to NTFS with --target The culprit can be the kernel itself. Access technical how-tos, tutorials, and learning paths focused on Red Hat’s hybrid cloud managed services. Comments. g. Unmounting All File Systems. There is an alternative on Linux though. changed initrd. The remote filesystem is not mounted. If the mount point is busy, then use the -l parameter with the umount command: $ umount -l /mnt/efs Auto-mounting a file system using /etc/fstab. Changing the partition table to GPT (GUID Partition Table) fixed the problem. Once no processes are accessing the unmounted file system, the umount command executes and actually detaches the file system. (With umount version Apr 7, 2020 · Fixing the Device. com/roelvandepaarWith t A system reboot would be expected in near future if you’re going to use this option for network filesystem or local filesystem with submounts. <filesystem> helper is called if one exists. Collaborator. You may also unmount filesystems manually. Before forcing the unmount of the file system, issue the lsof command and close any files that are open. For example, the command: mount /tmp/disk. +f --tells lsof to treat the subsequent argument as a mount point; it usually, but not always, manages on its own, so that lsof /media/usb0 also works. See File system forced unmount for the consequences of doing this. Aug 31, 2013 · Sep 1, 2013. filesystem lives may also work, but is obsolete, mainly because. Now, for the life of me, I cannot unmount it. To unmount (or detach) an attached file system from Linux, use the umount command followed by either the device name or mount point. Apr 21, 2020 · Past 24 Hours: 3. # fuser -cu /mount_point # kill -9 pid Regarding your /etc/mnttab file being out of sync with your /etc/fstab file or bdf report, rename /etc/mnttab and make a new one this way: Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Jan 16, 2024 · 4. $ umount [MOUNTPOINT] For example, the following command will detach the ISO image file mounted at “ /mnt/iso “. It unmounts the mount point from the Linux filesystem. Nov 29, 2006 · Use this command to verify and kill any processes still attached to a mounted filesystem. Note that: filesystem is the name of the filesystem being checked and looks something like “sda1” or “sdc1”. Option 1: Force unmount. Cause 1: You're attempting to run the umount command from within the mountpoint directory. The command that I executed to unmount the filesystem was: # unmount /one/two/three/four. This time, fsck checks the disk and reports it as clean, or with errors. -a All of the file systems described in /etc/mtab are unmounted. Converting to an Ext3 File System 5. Apr 3, 2023 · To achieve this, run: fuser -kmv /Path/ to /target. If I type " mount ", it appears that the directory is no longer mounted, but it hangs if I do " ls /mnt/data ", and if I # xfs_repair -n /dev/sda1 ERROR: The filesystem has valuable metadata changes in a log which needs to be replayed. To unmount all currently mounted file systems, you can use the -a option with the umount command. conf: Permission denied. " You must tell umount which file system you are unmounting. Note: To remove the first title line of the fsck tool “ fsck from util-linux 2. Read developer tutorials and download Red Hat software for cloud application development. To unmount all the file systems in one go, then execute the below umount command. There are a few steps you can take, but all are destructive to the data on the device. Mount the filesystem to replay the log, and unmount it before re-running xfs_check. {list of applications keeping it busy} [ CANCEL | EJECT ANYWAY ] Aug 3, 2012 · You try to mount a nfs-filesystem located on a remote server. mount -t msdos /dev/fd0 /mnt/floppy. To fix umount target is busy error, a methodical way is the Lazy unmount. これがfstabを書き換えたときに即時で反映されるわけではないので、何も知らないと What に指定されているデバイスが古いままの状態になり、. The Ext4 File System" Collapse section "6. Buy select Red Hat products and services online. There is also a command-line tool switch_root (8) but it is Okay, here's the deal: I used FUSE to mount a webdav endpoint as a filesystem. Mosty likely your NTFS superblock is damaged. This finds open files (even unlinked ones), memory mapped files, current directories, and some more obscure Feb 23, 2023 · 2 Answers. Using umount -l calls a "lazy" unmount. 3 to 19. Unmounting a CD. The contents of the floppy disk in /dev/fd0 should now be accessible from /mnt/floppy. Once you determine the processes you can stop them and unmount the file system. edsantiago opened this issue on Jun 8, 2023 · 25 comments · Fixed by containers/storage#1724. umount /dev/sdd1. Mounting ACFS File Systems. The kernel performs journal recovery when mounting the XFS file system. -i Don't call the /sbin/umount. 1. I am trying to unmount a filesystem. Mar 15, 2020 · Ubuntu: Unable to format usb drive (udisks-error-quark, 14) (3 Solutions!)Helpful? Please support me on Patreon: https://www. Feb 23, 2023 · I specifically said "select the partition and right-click the partition (or click the double-cog button under the partition, then "repair filesystem". Try, buy, sell, and manage Nov 6, 2021 · A loop device is a "pseudo device" which allows a file to be mounted as a filesystem. Method 2: use fuser. Sep 15, 2022 · This command is only necessary if the /mnt/floppy directory doesn’t already exist. Step 2: Fix your /etc/fstab. Aug 7, 2012 · try to remove your fs from /etc/filesystems. The -a option causes all of the filesystems described in /etc/mtab to be unmounted. At some point it broke. Reload to refresh your session. Goal. Unable to unmount ASMlib driver filesystem Solution Description Check what is the process accessing the /dev/oracleasm using lsof command and kill the process id. As the name implies, this does a simple erase of the disk and marks the free space as "empty" with no file system or partition scheme. – ChanganAuto Feb 24, 2023 at 0:01 In case unmounting fails, try to remount read-only-d: In case the unmounted device was a loop device, also free this loop device-i: Don’t call the /sbin/umount. -d In case the unmounted device was a loop device, also free this loop device. a traditional SATA port. (rmfs /filesystemname, or delete it with an editor if that wont work) and remount it over another path. sudo umount -a. The current directory was /one/two/three/four when the command was executed. The best thing to do is to end the offending process, change its working directory or close the file handle before unmounting. Closed. I think the unmounting the datastore problem may just be a symptom of the vcenter crashes that then cause all these other problems we've seen. You signed out in another tab or window. But take care! mount --make-rslave m. #18831. 04,硬盘直接安装。ea error:unknown filesystem grub rescue> 研究了半天,才解决这个问题。先说说是怎么回事。 安装ubuntu时,启动是用grub2进行启动。我的win7在C盘, Ubuntu空间是从D盘里分出来的。 Red Hat Ecosystem Catalog. Learn about our open source products, services, and company. Device or resource busy. Note that there is no "n" between the "u" and the "m"---the command is umount and not "unmount. #2. 2. Select your drive there ( /dev/nvme0n1 ), and the 2nd partition ( /dev/nvme0n1p2 ). Jul 22, 2018 · Add a comment. 31. Find hardware, software, and cloud providers―and download container images―certified to perform with Red Hat technologies. If it cannot write to file system it would point to a faulty NAND. The mount command already fails with the errormessage "Cannot mount a file system that is already remotely mounted". Jan 30, 2018 · 文章浏览阅读2. Right click on the 2nd partition, select Check, and press the green check mark at the top (if you get a message if you want to continue, select Confirm). So I decided to use 3uTools and update the iPad from it using the retain data option. edegraaff commented on Feb 27, 2021. Option 0: Try to remount the filesystem if what you want is remounting. ** Create a mount point for this partition to live in. mount | grep /mnt/. Aug 20, 2020 · Important Notices; ↳ Rules & Notices; ↳ Releases & Announcements; ↳ Main Edition Support; ↳ Beginner Questions; ↳ Installation & Boot Jun 26, 2013 · I have made some tests: 1. patreon. The file system unmount is enabled by cleaning up the resource held in a certain condition. If you are unable to mount the filesystem, then use the xfs_repair -L option to destroy the log and attempt a repair. The filesystem will still be mounted Jun 8, 2023 · unmounting/EINVAL flake #18831. You essentially need the equivalent of a driver in order for linux to know how to read/write to the disk. mount: you must specify the filesystem type . In the case where you only have 1 partition (other than the EFI partition) where your OS files/root-filesystem are stored, you have to use a live USB drive/CD to partition the single partition. the user yanking the device or pulling the media out) or unmounted in a way that bypasses the Unmount() method (e. Unmounting ACFS File Systems. sudo fsck -p /dev/filesystem. This command attempts to unmount the filesystem associated with the device /dev/sdb1. Sometimes, it may be necessary to unmount a mount locked filesystem. The command removes all references to the detached file system as soon as it is no longer busy. This is however not true for all filesystem-specific checkers. But now is seems all right. Exactly! I had loop devices mounted onto . Past 30 Days: 68. Here this option is not to really do unmounting a filesystem. 3. The mount point of the filesystem is /one/two/three/four, and the name of the device file is /dev/sdb8. Do so by providing the file system's mount point. Oct 20, 2010 · When a filesystem is unmounted, any cached filesystem data in memory is flushed to the device. Past 7 Days: 14. In other words, we get the same behavior in both situations: once mounted with a given permissions set, we can modify it without unmounting first. xz (fs posix compatibility test in linuxrc) to have possibility to make changes in folder for NTFS - it also doesn't work for saving changes (changes=exit: and probably changes= for last writes to disk by exiting), dump-session is ok, (by this and other tests some my files were removed from disk so don't make links to your folders on real fs if you are You cannot unmount the root filesystem, since it is always in use — at the very least, by whatever process is invoking the "umount" syscall. errno = 1600 Failed to connect to the storage container. The correct thing would be to zpool export the pool. Technique 4. Erro ao montar o sistema de arquivos - Linux MintComo corrigir Erro ao montar o sistema de arquivos no Linux MintSiga nas mídias sociais:Site - https://ar7te Mar 22, 2022 · A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more. 7 and later the proc filesystem is not unmounted. -a: All of the file systems described in /etc/mtab are unmounted. 不要になったディスク(=古いデバイス)を削除する. /dev/nvme0n1p6 (which is your / root partition) being equivalent to something like /dev/sda6. unmounting/EINVAL flake. It means that some process has a working directory or an open file handle underneath the mount point. Error: fusermount: failed to open /etc/fuse. $ diskutil eraseDisk free Empty /dev/diskX. (However, with umount version 2. mkdir /mnt/floppy. Certain file systems will always be in use - like the boot and OS partitions. Indeed, you should do this when removing writable media such as diskettes or USB drives or memory keys. Run the following command to unmount the file system: $ umount /mnt/efs. Corruption. Default behavior disables the automatic mount of the file system using the mount -a command. Sep 10, 2014 · But at their inception I am wondering if that's when the helper process is spawned. In order to mitigate this add your user to the fuse group. 在终端输入如下命令,查看分区挂载情况sudo fdisk -l 最末尾/dev/sdb1 就是出问题的硬盘2. Problem conclusion. Oracle Database - Enterprise Edition - Version 11. Note: You might want to run the following command to make sure it really has that UUID number and that it is in fact formatted to ext3: Code: Select all. In theory I should be able to reboot the hosts and as long as vcenter doesn't crash the unmounting problem won't occur DESCRIPTION ¶. It looks as if one cannot format it or write to it in this state. reiserfs(8) will not report any corruption if given this option. sets up the loop device /dev/loop3 to correspond to the file /tmp/disk. Make a bootable ubuntu pendrive and use that to resize your hardisk , you cannot resize while using a ubuntu system because for safety of operating system. 0. the -p option tells fsck to fix any problems which do not require user interaction automatically. The only way to access them when the partition (s) aren't mounted is to boot from alternate media - an SSD, HDD, flash disk, USB disk, CDROM, DVD, something else. umount -R m. In this context, corruption means errors on the file system caused by, for example: Sep 24, 2007 · In addition, the -f option forces unmounting in the case of an unreachable NFS (network filesystem) filesystem. remount. Disallows the execution of binary files on the particular file system. The command line version of the tool works better in my experience: woeusb --device Win10_1909_English_x64. Option 2: Kill the processes using the filesystem and then unmount it. The syntax is straightforward: umount [options] <mountpoint|device> For example: umount /dev/sdb1. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Mar 24, 2020 · 本人安装的是win10+ubuntu16. Apr 1, 2019 · iPad Air 2 stuck at 20% unmounting filesystem. . In this case, you must reboot the node to The culprit can be the kernel itself. /dev/sdX might be different on your system such as sda sdb , make sure to check the device path using gparted or fdisk. (HOW: Hold CTRL and ALT, hit T ). img /mnt -t vfat -o loop=/dev/loop. This is particularly useful when preparing to shut down or reboot the system. Jan 8, 2024 · Linux umount command to unmount a disk partition. Unmounts the specified containers’ root file system, if no other processes are using it. When you try to umount the (not mounted) remote filesystem you get the message "0506-347 Cannot find anything to unmount". unmounted by the super-user by using the umount (8) command directly), the device will be unmounted (if needed Oct 25, 2023 · Unmounting Filesystem in Linux. <filesystem> helper even if it exists. In case unmounting fails, try to remount read-only. ipsw. Temporary fix. dm-2 was working well until one day it became a read-only system (I have no idea why this could happen. My server has /dev/dm-0 , /dev/dm-1, /dev/dm-2 . 2 to 19]: How to Mount or May 26, 2022 · Lazy unmounting is used to unmount the mount point from the Linux filesystem hierarchy. For an iso image, unmount it from its mount point directory: $ sudo umount /mnt/CorePlusIso. To unmount multiple filesystems adhere to the command: $ sudo umount /dev/sdb1 /mnt/CorePlusIso. In order to unmount a filesystem, you must unmount its submounts first (and the same for their submounts, recursively). Mar 18, 2024 · The system automatically detects that the source filesystem is already mounted read-only, so it doesn’t permit us to change the original permissions even for a new mount. Where, -l : Also known as Lazy unmount. Creating an Ext3 File System 5. This is for cases where VCS service groups having DiskGroup resources configured with UnMountVolumes attribute set and the volumes are mounted outside of VCS control (this is not very common). So just imagine in your case /dev/nvme0n1 being equivalent to /dev/sda and e. Open the "Disks" on ubuntu. noexec. And filesystem for dm-2 shows empty. Use the umount command to unmount the filesystem, specifying either the device name or mount point as an Sep 22, 2015 · Cannot mount /dev/dm-2 . (save /etc/filesystems or the stanza for your filesystem first) Last edited by funksen; 08-07-2012 at 04:46 AM. In particular, fsck. Solution 1: Move to a directory outside the file system mount point, and retry the umount command. This answer is very important, because it helps people, who've known lsof and fuser for ages xfs ファイルシステムがハングアップし、xfs_check を実行すると以下のエラーが発生します。 # xfs_check /dev/sdm1 ERROR:The filesystem has valuable metadata changes in a log which needs to be replayed. I had this same problem with a 4TB disk. This is normal if you have your disk connected through an NVM Express port instead of e. Mar 23, 2017 · First, you can check the partition with file /dev/sdb1 to see if it looks like an NTFS filesystem. Solution. The file that you need can be found in the Synaptic package manager, by typing 'exFat' into the search box. Jul 16, 2013 · The filesystem on your external drive isn't natively supported by linux. ht Jan 17, 2023 · In this Document. root # umount /mnt/archIso. The disk used the MBR partition table, which has a 2TB limit. img, and then mount this device on /mnt. A file system must be available for unmounting. For example to unmount a file system (dev/sdd1) mounted at /data, you could enter one of the following: # umount /data. Container storage increments a mount counter each time a container is mounted. sudo dd if=/dev/sdc of=/dev/null bs=1m count=1. If you are unable to mount the filesystem, then use the xfs_repair -L option to Jul 24, 2023 · Unmounting a Filesystem in Linux. Mar 22, 2013 · Step 1: Don't use the Disks utility. Erase Disk. Use mount with the -t flag (short for “type”) to specify MSDOS as the file system. Any time I try and interact with it in any way, Oct 9, 2014 · BUMP Re: unmount error, udisks-error-quark, 14 Originally Posted by coffeecat If a thread drops off the first page unanswered, which it can after a few hours, it is less likely to be seen. You can also try mounting manually with sudo mount -t ntfs-3g /dev/sdb1 /path/to/somewhere Without knowing what went wrong, all you can do is troubleshoot. I've tried to force an unmount, but it doesn't seem to work: $ umount -f /mnt/data. nouser. The recommended use-case for umount -l is to prevent hangs on shutdown due to an unreachable network share where a normal umount will hang due to a downed server or a network partition. In order to unmount the file system, no application or user may use the file system. 737: Checking PC DiskSpace. $ sudo umount /mnt/iso. Feb 17, 2014 · Unable to unmount a file system containing a program that used the shared symbol table capability. 6w次,点赞32次,收藏72次。Ubuntu 电脑下插入移动硬盘,显示不能挂载该硬盘解决方法:1. iso files on the partition in question. We just provide the filesystem name or the mount point following the umount command. Check with: mount | grep <mountpoint>/ For loopback mounts, also check the output of: losetup -la Anonymous inodes (Linux) Anonymous inodes can be created by: Temporary files (open with O_TMPFILE) inotify watches Jun 26, 2021 · ******************************************************************Any Questions regarding this video , you can ask in the comment section. Reverting to an Ext2 File System 6. A file system is considered busy if a user is accessing a directory in the file system, if a program has a file open in that file system, or if it is being shared. In those situations, you can use the fuser command to find out which processes are accessing the file system: fuser -m DIRECTORY. The disks will be in use as long as the pool is imported. - iPhone 7. :)**************** Mar 18, 2024 · The umount command notifies the system to detach the given mounted filesystems. sudo umount /mnt. You switched accounts on another tab or window. Some commands that are able to verify this by trying to read the drive are (assuming the device node is /dev/sdc ): sudo fdisk -l /dev/sdc. When a container is unmounted, the mount counter is decremented, and the container’s root filesystem is physically unmounted only when the mount counter Apr 16, 2021 · So a system with the root filesystem unmounted is not very useful, other than as a final step before reboot or shutdown. Aug 24, 2018 · 1 Answer. You have to first unmount it and then run the filesystem check like e2fsck /dev/sda1. Cause 2: An abrupt disconnect from the file system's mount target occurred. You can also try the umount command with -l option on a Linux based system: # umount -l /mnt. This will first request your password, then install the driver and utils / tools for exfat a filesystem similar to "FAT" or "VFAT" and also the Linux NTFS, either of which you might need; but: I'm Unmounting an EFS file system. The Ext4 File System" Jan 11, 2021 · Check & Repair Corrupted File System. The real way to switch from one root filesystem to another (e. You can unmount the file system by using umount with the device or the mount point. 737: Detecting Connection. Oct 1, 2014 · 2. To unmount a mounted file system, use the umount command. 9. Mar 21, 2023 · Unmounting ( umount) fails with a message: device is busy. Then, we unmount sdb and run the same command again. . If they abort with an I/O error, the Apr 24, 2018 · For some filesystem-specific checkers, the -n option will cause the fs-specific fsck to avoid attempting to repair any problems, but simply report such problems to stdout. Aug 3, 2012 · You try to mount a nfs-filesystem located on a remote server. Mar 22, 2019 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Nov 1, 2020 · Table of Contents. But it is a useful technique. Remounts the file system in case it is already mounted. For example, if we want to unmount the previously mounted USB stick and ISO image: root # umount /dev/sdd1. Sorted by: 13. Without the first command, you risk unmounting all the sub-mounts on the source, due to mount Apparently when mounting this device the kernel detected that your file system has not been cleanly unmounted, so it might have errors. The umount -l /data actually worked - the FS disappeared - but later unmounting /dev/loop0 and /dev/loop1 hanged for a while. The Ext3 File System" 5. What に指定されているデバイスがなくなったことをsystemdが where /media/usb0 is the mount point of the USB drive or other filesystem to unmount. Disallows an ordinary user (that is, other than root) to mount and unmount the file system. from the boot-time initramfs to the real root filesystem) is using the pivot_root (2) system call. The Ext4 File System Expand section "6. All Time: 6,618. iso /dev/sdX --target-filesystem NTFS. Giving the special device on which the. $ umount: /mnt/data: device is busy. Lazy Unmount. While sdb is mounted, the tool exits without running a check. then hit Enter. Get training, subscriptions, certifications, and more for partners to build, sell, and support customer solutions. 737: Start flash. Only the users that are part of the group fuse, and the root user can run fusermount command. Dec 28, 2021 · Am getting a lot of iPhone 11 with this problem, iPhone on recovery mode, i try to restore and everything goes okay till almost ending and then restore ends at Updating Rose Here is 3utool Log: Code: 06:42:25. If the device is removed without being unmounted (e. The Ext3 File System" Collapse section "5. Mar 11, 2023 · Stack Exchange Network. ro Oct 14, 2023 · When the live system booted, close the installer window or select Try Ubuntu, and open GParted. A filesystem is specified by giving the directory. 1. You can make a file system available for unmounting by doing the following: Changing to Mar 14, 2019 · If you want help umounting storage (umount is the command, not unmount), it cannot be in use. To unmount a CD that was previously mounted to the /media/cdrom/ directory, type the following at 5. where it has been mounted. 2 using an . helper even if it exists. $ umount [DEVICE] #OR. On Linux, you might encounter a situation where a GPFS file system cannot be unmounted, even if you issue the mmumount -f command. Raspberry pi3 b+ Synology NAS with iSCSI copyed latest image and distributed it to my sd card then boot pi and configure to connect to The filesystem should be unmounted using the Unmount() method. Another filesystem mounted on the filesystem you are trying to umount will cause grief. I have an NFS-mounted directory on a Linux machine that has hung. Jul 5, 2017 · 50. It went pretty smoothly after mounting filesystem between 10-20% then it got stuck at mounting filesystem for May 14, 2020 · sudo fsck -M /dev/sdb. Get product support and knowledge from the open source experts. Other than the naming, there should be no notable The umount command detaches the mentioned filesystem(s) from the. Hello, everyone! So I decided to update my iPad Air 2 (Cellular) from iOS 9 to iOS 12. According to your comment the USB drive is broken. The first two could be mounted successfully while the third one fails with the message. ) /etc/mtab is a file that is similar to /etc/fstab and which is Jun 20, 2022 · How to check if the filesystem is locked by VCS: # mount -v | grep mntlock . It went pretty smoothly after mounting filesystem between 10-20% then it got stuck at mounting filesystem for Aug 18, 2023 · Unmounting the ISO Image. By default /sbin/umount. If it is a USB device labeled /dev/sdb1, we can unmount it with the command: $ sudo umount /dev/sdb1. or. bs vf ts cu jp og sq yq xo wj