The ext4 or fourth extended filesystem is a journaling file system for Linux, developed as the successor to ext3.

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Formatting a USB flash drive as ext4

I'm making a custom bootable USB flash drive with a persistent partition. Formatting the partition as ext2 obviously makes the filesystem very sensitive to improper unmounting. I remember a while back ...
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Accidentally partitioned media drive as ext3 during install (was ext4), how can I recover?

I recently did a fresh install of ubuntu on a system with an old ubuntu install. I have a separate hard-drive which used to have a single ext4 partition, but during the install I accidentally selected ...
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710 views

Recovering a file after having formatted from NTFS to EXT4

I used to have windows 7 but I've recently formatted my hard drive to install kubuntu and I've just realized that I forgot to backup a hidden .dat file which defines my bitcoin wallet. Is it possible ...
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very high IOWait + extremely slow hdparm -tT

I have been running 12.04 on my Fujitsu Siemens Lifebook E751 for almost a year without any problems, and then several days ago I noticed a very high CPU IOwait that makes the system poorly responsive ...
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318 views

Using Ext4 partitions on external storage

If I want to use a USB flash memory or an external hard disk to transfer data and at the same time I want to use ext4 partitions on them. How could I do that without getting problems regarding ...
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218 views

Ubuntu and fat partition, why and can I change it?

I have a mac from 2006 and it is already not supported by new Apple system. So I did get back to Linux and I did chose Ubuntu 13.04. I did install Ubuntu side by side with OSX, but I did notice that ...
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533 views

How do I fix my broken/damaged Kubuntu installation?

(I am dual booting Windows 8 and Kubuntu.) I've been having a lot of fun with Kubuntu. I've done a lot with it, including installing GNOME desktop, just to try it out. One day I was in Steam and I ...
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File recovery after reformattig ext3/4 partition — extract old journal/superblock?

I seem to have reformatted my /home partition (previously ext4) as ext3 during an Ubuntu installation. It took me a couple of mounts to figure that out. Which, of course, is a bad thing. I've tried ...
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orphaned inodes on root file system (ext4); persistent problem

On my trusty systems (VMs under vmWare, desktops, and laptops), we have the following issue. The root file system seems to have inodes that are never marked as "free". After a month of a working ...
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339 views

Xubuntu 14.04 Automount ext4 USB Stick as root

I recently formatted my new Sandisk USB Stick with linux from the default FAT32 to ext4. Unfortunatelly, when Thunar Automounts the stick, it is mounted as root and not as the current user, so if I ...
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Is there a way to find the LBAs for free blocks in ext4

tune2fs can show the number of free blocks. Is there a method/tool to find the actual logical block addresses for each free block? Thanks in advance
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224 views

Install a software throe wine on ntfs partition

I have a question I want to install windows software, but I do not have enough space on ext4 partition, so if I install the software on ntfs directory will the software run as it would run on ext/home ...
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Cannot install Ubuntu 14.04 on new SSD - the ext4 file system creation in partition #1 (0,0,0)(sdd) failed

I'm a linux noob trying to install ubuntu 14.04 to a new 120 gb Kingston SSD. I'm aware there are other questions relating to this but I cannot find anything useful. Apologies if I have overlooked an ...
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248 views

Explanation of entries in dmesg log in Ubuntu Server 14.04

A few days ago I did a clean install of Ubuntu Server 14.04. Everything is working fine, but when my system boots I get these entries in dmesg log: [ 3.106082] EXT4-fs (dm-0): mounted filesystem ...
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56 views

Lost all files in root partition without formatting partition and delete operation, TestDIsk is not help?

I've Windows 8.1 and Ubuntu 14.04 installed in my PC. Two system were in different disk. All disks are in GPT mode. I used one software, "Paragon ExtFS for Windows", which can mount EXT4-partition in ...
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166 views

I don't understand the behavior of e2fsck

I've got a USB drive that's 1TB in size and has a bunch of media files on it. It originally had an NTFS partition, but I'm moving to Ubuntu Server 14 so I wanted to convert it to an ext4 drive. I use ...
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31 views

Is ext4 position independent and movable?

Does the data in an ext4 filesystem refer to absolute positions on the disk, or is it all relative to the start of the specific partition? I want to know this because I want to move an ext4 ...
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274 views

Bcache hangs on Ubuntu 14.04

I successfully setup my system to use bache in /home partition (200GB SSD partition as cache for 500 GB HDD partition). However, I keep receiving these messages: INFO: task bcache_writebac:222 ...
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Ext4 switching to read only mode

I have very frustrating problem. My server randomly switches / mount to read only without any pattern. Only message that I've found in logs is: htree_dirblock_to_tree:920: inode #14286877: block ...
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300 views

How long does ubuntu take to create ext4 journal;ing file systems for 500Gb drives?

I have a new server with four new 500Gb rotary hard drives. I am installing Ubuntu 14.04LS from a bootable USB flash drive. I asked Ubuntu to format the HD's with ext4 journaling file systems. Three ...
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dd'ed the first 200MB of a HDD, is the filesystem recoverable?

In a moment of stupidity I let a script run dd on one of my (non backed up :() HDD's, 3TB in size. It had a single ext4 filesystem on it, which now won't mount. Things I've done so far (without ...
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My portable HDD cannot be mounted into filesystem — can't read superblock

I have a Seagate portable hdd 1 TB formatted fat32. Now I had no problems at the very beginning, but now I am getting the following error: Error mounting /dev/sdb1 at /media/zorobabel/EFI: ...
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239 views

How to expand the ext4 partition of virtualized Ubuntu running on top of CentOS/QEMU?

My company is running Xen--VMs run on top of CentOS/QEMU. Recently a customer using virtualized Ubuntu asked that his HDD space be increased. Now, with Windows, this is a joke. You type the new size ...
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574 views

Can't recover formatted Ext4 partition file system. :( Suggestions?

I've been at this for days now, so I'm hoping you can help me! Original setup: This is a 200GB firewire drive, originally formatted via Ubuntu 11.04 Disk Manager with a Master Boot Record, and a ...
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346 views

Why's Clonezilla not able to complete the backup of my HDD (ext4)

I have a single HDD with one single partition. What I need is to make an entire backup image of it and burn it to a DVD so that, in case of a messup, I can restore the entire HDD, as it was before. ...
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341 views

Permissions to access an encrypted external HDD

I have an external HDD which has an encrypted ext4 filesystem. When I plug it into one of my laptops and provide the encryption password, I get this popup box saying: You do not have permissions ...
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Ubuntu 14.04, ext4 remounts read-only 10-30 minutes after hibernate

After waking the laptop from hibernate, it successfully resumes. There are no errors in /var/log/pm-suspend.log and the filesystem is mounted read-write. After 10-30 minutes of regular use including ...
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fsck took only two seconds to report “clean”. What did I do wrong?

I booted a LiveCD (Ubuntu 14.04.2) and opened a terminal window. I used sudo lshw | more to determine that my usual boot volume was logically named /dev/sda1 . It's the primary partition on a 1 ...
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/proc/fs/jbd2/partition/history - how to enable?

I have the /proc/fs/jbd2/partition/info file that produces the summary of what happened in the partition's journal so far, but I am not able to see the history file. It doesn't exist. What should I do ...
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47 views

Ubuntu Server 14.04.2 LTS restarts continuously

is my first time asking here, so, congrats for the forum, is very instructive! I have an Ubuntu Server 14.04.2 LTS (64bits), and when Im working with that, I don't know exactly why, it restart again ...
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Error mounting SCSI drive on Ubuntu Server 14.04

I'm trying to mount a SCSI Drive on my Ubuntu 14.04 server. To mount I entered this in the Terminal: geza@Server1:~$ sudo mount -t ext4 /dev/sdb /media/sdb mount: wrong fs type, bad option, bad ...
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Problem with EXT4 in Ubuntu 14.04

I tried to create a file system EXT4 on flash drive, and I failed. The resulting file system was not mountable. Mount gave an error. In addition, I formatted the drive in other distribution in EXT4 ...
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ext4 partition lost after windows installation.How to recover it?

My disk had two partitions one was an extended partition containing my root and swap space and the other was an ext4 partition. Recently I installed windows 8.1 on it by shrinking the ext4 partition ...
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Why are ext4 filesystems owned by root?

I formatted a flash drive to ext4 and created a new partition on my hard drive with fs type ext4. Both were owned by root and I had trouble writing files. Why does that happen? Also, if that has no ...
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Unable to Mount ext4 filesystem: bad block size 65536

root@vagish-SVL24115FAB:~# lvdisplay --- Logical volume --- LV Path /dev/vg1/lv1 LV Name lv1 VG Name vg1 LV UUID ...
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problem re-installing ubuntu 12.04 LTS amd64 on DELL inspiron 5454

I've just bought a second hand DELL. I always use Ubuntu, and DELL is usually very simple and straightforward, I usually never have any problems. However this DELL is having problem after problem. ...
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250 views

Input/output error on mounted usb disk

I have an external usb disk mounted to my machine, and everything works fine for hours or days, but eventually I cannot access the disk anymore. When I try to list the mounted directory, I get ls: ...
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Why is my read speed limited to 40 MB/s (< 25 %) reading from ext4 when compress-force is zlib and there's no CPU usage?

I'm moving data from an ext4 filesystem on a HDD connected with USB 3.0 which usually reads and writes with 170 MB/s to a btrfs subvolume on a SSD which usually reads and writes with 360 MB/s with ...
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gdisk before umount -> file system corrupted

I think I did something stupid, but I don't know how to fix it... Please help: I connected a NTFS format 2TB HDD to my ubuntu, and would like to format it to ext4 I mounted it, and copied the files ...
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EXT4-fs errors and sd errors. Rejecting I/O to offline device

System Configuration: Ubuntu 12.04 server 64bit HP Proliant dl140 g3 32gb of RAM Intel X5365 quad core 3GHz LSI SAS1068 2x WD black 2TB SATA HDDs in RAID 1 Errors: [ 2044.430919] EXT4-fs (sda1): ...
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Unable to mount usb thumb drive due to write protection

I have a thumb drive called EndroCraft-Lin, that all of a sudden turned read only, then became unable to be mounted. It's a PNY 8GB usb stick, that's formatted to an ext4 filesystem. Here's the error: ...
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Grub rescue after corrupted hard-drive ('read-only filesystem")

I run xubuntu 12.04 alongside a NTFS storage partition and a windows 8 partition. I moved my MySQL data directory off the xubuntu (ext4) partition, onto the NTFS partition, and did an import of a ...
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EXT4 - jbd2/dm-1-8 - lazy initialization

I am running an operation that requires a lot of disk IO. It was going extremely quickly on my 500GB SSD until jbd2/dm-1-8 appeared in my iotop and is now permanently at 95-99%. From reading online, ...
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Synology file recovery using extundelete

It's never easy... build a Ubuntu machine for the expressed purpose of recovering deleted files or folders from a Synology NAS using extundelete. I took one of the RAID1 drives out of the Synology ...
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How to modify the starting boundary of an ext4 partition?

There are 4 partitions on the disk. parted /dev/sda --script -- print ... 1 1049KB 50.0GB ... ext4 2 50GB 82GB ... linux-swap 3 82GB 100GB ... ext4 4 100GB 1000GB ... ext4 My goal is to ...
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slow hard disk Ubunto 14.04 ext4 on thinkpad dual boot

Ext4 - is it slower? Have a Thinkpad with 8GB drive , 4 processors. Intel® Core™ i3-3110M CPU @ 2.40GHz × 4 . Ubuntu 14.04 LTS with updates applied. File reading is very slow. IDE STS hangs when a ...
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Is my harddrive broken?

I've got a new 4TB drive. My old (2TB) drive was NTFS formatted. I formatted my new drive with a single 4TB partition to ext4. I've moved content of my old drive to the new drive to format my old ...
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243 views

bcache corruption after reboot

bcache seems to work fine, but after rebooting, the ext4 filesystem stored in /dev/bcache0 frequently, but not always, becomes corrupted - seemingly, it only damages metadata for recently modified ...
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575 views

ext4 partition of a 1TB hdd keeps slowing down when in use

I have a 1tb hard disk that has 3 partitons, a 890 ext4 partition and 2 ntfs partitions that add upto around 70gb Accessing the 2 ntfs partitions is fast and read and write operations on them are ...
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269 views

Difficulty mounting Ubuntu 12.10 (64-bit) on new HDD

To the gentle membership of the Ubuntu Linux Forum: After my laptop passed away a few weeks ago, I made up my mind to build n open source system. So I put together a computer for this purpose. I have ...