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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632 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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211 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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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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250 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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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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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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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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27 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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255 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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198 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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251 views

Ubuntu 12.04 ext4-fs error/inode

I am running a Dell PowerEdge T420 with Ubuntu 12.04 32bit. The hard drives are a RAID1 setup. Last week, I began getting errors that cause the build I am running to fail. I found this in the log ...
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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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474 views

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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173 views

Problem creating ext4 partition

I can format partition to linux-swap and ntfs, but can't for ext4. I did boot on a ubuntu usbkey in "try ubuntu" mode. /dev/sda1 was unmounted Here is gparted reports : GParted 0.11.0 ...
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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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530 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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Ext4 Data Recovery Help

My data is on an Ext4 disk that is very corrupt, here is the output from fsck.ext4: http://paste.debian.net/plain/47345 (There are 664 inodes containing multiply-claimed blocks.) Why has this ...
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326 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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331 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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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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100 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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26 views

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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459 views

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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110 views

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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276 views

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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212 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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Block size of 4096 Byte min. file size is 1 MB

If I create a new text file of size 1 KB, it takes 1 MB on my disk, although block size is 4096 Byte, how is this possible and how can I change this? System: Ubuntu Server Kernel: 3.5.0-39-generic ...
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366 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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54 views

Superblock error

Here's what I did: I wanted to reinstall the system so I ran Ubuntu Live CD, started to resize my HDD partition and suddenly everything crashed, the black display appeard. Then thought that I ...
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130 views

Ubuntu installer on ext4 partition on sd card

I have an 16 GB sd card, which I'm using in order to make a triple-boot installer with osx, windows 8.1 and ubuntu 14.4. I am trying to make it with three partitions, namely hfs, ntfs and ext4, so ...
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Problem with booting Ubuntu 14.04 from a btrfs partition

I have installed Windows 8.1 Update 1. After that I have installed Ubuntu 14.04 on a btrfs partition. However, after the restart there was no GRUB menu to choose from and the system booted directly to ...
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Files tranfered from ubuntu to an external NTFS hdd are UNREADABLE in Windows. Why?

Transfered files from Ubuntu-ext4 to NTFS HDD are UNREADABLE in Windows. I have transfered files from ext4 Ubuntu hdd[my notebook] to an external NTFS HDD used in windows[a workstation]. Before i ...
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Hardware RAID1 - ext4 errors won't go away with fsck

Short summary: yesterday my server's root drive (RAID1, 2 identical drives mirrored) was kicked into read-only. Trying to reboot I saw superblock errors, so I boot into Live-CD and fsck the drive. It ...
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121 views

Ubuntu 12.04.4 ext4 filesystem, excessive overhead

I'm experiencing a baffling problem with two 12.04.4 servers I've just installed - there is what appears to be excessive file system overhead for anything I save on its folders; for example, a single ...
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44 views

wrong file system type passed to fsck

My Ubuntu hanged today while it was downloading, as it was unresponsive for long i shut it down forcefully . Later when i switched it on, it was not coming up so i used a live cd to fix the file ...
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267 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 ...
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Ubuntu take too long “Creating ext 4…”

So I got wifi problem with Ubuntu 14.04 LTS so i decide to switch to 14.10 version, it did solve the wifi problem because I can access the Internet while installing 14.10 version but the install took ...