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

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How to recover files from a partition that was previosuly NTFS under Wndows but after Ubuntu installation had been converted to ext4?

I had accidentally installed Ubuntu 13.04 on Windows 8 while trying to Dual Boot. I had a single partition(973GB) which had windows with NTFS filesystem. But by the accidental install of ubuntu the ...
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How to mount EXT4 drives from another system

I had a testbed 13.04 server which had a boot volume partitioned into three, root, swap and Workspace as well as two other drives running in raid 1. The Workspace and raid volumes were setup using LVM ...
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Trying to mount backup of /dev/sda as ext4 for recovery, fdisk reports invalid partition table

I used dd if=/dev/sda of=~/backup.img where /dev/sda was an ext4 filesystem. I want to perform recovery on it which means I need to mount it as ext4 filesystem using extundelete application. Can ...
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Do I use ext4 for all partitions (such as / and /boot)? What are the other formats used for?

I'm installing ubuntu onto a new laptop with 24gb SSD and a 500gb HDD. I wanted to put / and swap onto the SSD and /home onto the HDD. Is there anything I shouldn't use ext4 for? I do not ever intend ...
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Can not install Ubuntu (13.04 / 12.04) due to ext4 error

I was trying to install Ubuntu 12.04 LTS Desktop 64bit Edition on my new PC. (1TB SATA HDD) I set my mainboard to use BIOS to boot up. At first I tried installing next to Windows 7, got errors. Now I ...
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EXT4 Filesystem seems to have disappeared

I previously had an LVM consisting of a few different drives, including two 4TB Seagate USB's. I migrated my data off the drives. Copy -> Shrink -> Copy -> Shrink Once the drive was removed I ...
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sha256sum/md5sum gives different results for big files (Ext4/Full disk Encryption)

Yesterday I reinstalled Ubuntu 13.04 64-bit on my computer (4GB RAM), and for the first time I decided to use Full Disk Encryption (all default settings). Today while running backups my computer ...
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How to format an external drive to ext4 in Ubuntu 13.04 [duplicate]

In Ubuntu 13.04 the Disk Utility has been renamed to Disks and has a completely new interface. Using this new version of Disks I want to format my external hard drive to ext4, but the answers to this ...
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Shrinking down ext4 partition not working, Oracle VM (W8 host / Ubuntu 13.04 guest)

I've been trying to follow a myriad of directions all to no avail. I have a 49.4gb drive that is only using 12.1gb of space. I would like to reduce this drive to 20gb in order for it to be used on a ...
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601 views

e4defrag - what does output mean?

e4defrag shows many lines like (filename) 100% [ OK ] or (filename) 0% [ NG ], and at finish shows success/failures. Does NG mean it was not moved, OK means it was defragmented? What are the ...
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How can I change permissions on external drives right after formatting with GParted? [duplicate]

Using GParted, I have formatted an external HDD to ext4. As it turns out the default is that I have no write access. How can I change permissions on external drives?
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Mount error on new, empty External HDD - ext4

Apologies if this seems like a very similar question to others already on the site. I have searched for a few hours now for solutions, but nothing seems to be quite the same. I recently (2 days ago) ...
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124 views

Is IT possible to make a ext4 external HD completely open?

I bought a new external HD in order to use it like a usb key to exchange files between different computers, and I formatted it using ext4 The problem is that everytime I upload some files I have to ...
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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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430 views

Simple way to recover a deleted file in a sub-dir of an encrypted home directory (ext4 file-system)

I need a simple way to do it, such as one command or program to which: specify the directory the file was in ask for the list of the recoverable files found specify which files have to be undeleted ...
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Does the freequent use of CAT command badly affect the hard disk performance?

One the programs I've written requires merging many files into one, every 3 seconds. The merged file can be bigger than 1GB. I'm using cat command to do this. Cat seems to work pretty fast even ...
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432 views

noexec option enabled in fstab is not getting applicable for limited user. Is it a bug?

noexec option enabled in fstab is not getting applicable for limited user. Is it a bug? cat /etc/fstab # / was on /dev/sda2 during installation UUID=fd7e2645-3cc4-4c6c-8b1b-016711c2fd07 / ...
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Ext4 file system format drive does not show in Windows 8

To install Ubuntu 13.04 I formatted a drive with Ext4 file system format. After format I can't open the drive from windows 8 Explorer. Whenever I try to open the drive following error shows : Thanks ...
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Does the length of a filename change the amount of space it takes up?

Using a ext3 or ext4 file system, assuming that the files have similar checksums, would the following files: 8c87dba9cf4dbc27c0d54083311ffeef6821e8426f5a8d50165d84f5eef80103.npz 1.npz Take up a ...
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1answer
324 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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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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Converting my C:\ to NTFS from EXT4

I was playing with my computer attempting to install Ubuntu 12.04.2 LTS i386, and I accidentally converted my C:\ with Windows on it to EXT4, and Windows hangs on boot. All of windows is still on the ...
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Can I have two internal disks - one ext4 and one ntsf?

Can I have two internal disks - one ext4 and one ntfs? I am putting together a small home server with ubuntu desktop. I also want to use it for windows 7 backups, so if I install a ntsf hdd as well ...
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ext4 partition works but fdisk shows no valid partition table

I have a 1TB disk with a single ext4 partition. here's some output of parted print all command Model: ATA Hitachi HDS72101 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/4096B ...
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Amount of data written on a partition

Is there any way to find out how much data have been written on the partition since it was created? Talking about ext4 fs.
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640 views

Does copying files from NTFS to EXT4 degrade/corrupt the files?

The reason I ask is I am very new to Ubuntu, but I want to get into mobile development. I installed Ubuntu alongside windows 8 but it just doesn't run quite as well as I would expect so a friend ...
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How to expand the ext4 primary partition size in a VMware Player virtual disk?

I have a VMware Player virtual machine setup, running Ubuntu 10.04 as the a guest OS. The VM was created on a 20GB virtual drive, with a single partition for working space. Finally I got to the point ...
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254 views

Resize ext4 /home partition from start sector

I need to resize my ext4 /home partition to make space to my boot partition before it. The thing is to do so I need to change the start sector of my home partition (the boot partition is extended on ...
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223 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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ntfsresize -b -f not working chkdsk /r freezing

I've got a failing hard drive. Don't have the funds atm to buy a new hard drive. So I need to hold up. My main operating system is now ubuntu which is able to run the hard drive fine without any ...
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How to backup Ubuntu partition via Windows?

I wanted to make a backup of my Ubuntu (12.04) partition before upgrading to 13.04, but I've come up against a snag. None of the tools I can find can make an image of the currently-mounted drive - ...
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Hide ubuntu partition in win7 [closed]

I was searching forum but I didn't find solution to my problem. I've installed Ubuntu 13.04 and Win7 on one HDD in UEFI mode. I'm able to boot in both OS'es separately from grub (added some entries). ...
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280 views

Hard Disk Formatting Error

so here is the situation.. I installed Ubuntu, pretty sweet.... all was going well till i tried to install an application " LPCXpresso IDE for ARM micro controllers" now the PC hung up as soon as the ...
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712 views

Cannot format USB drive to ext4 [duplicate]

i'm trying to format USB drive (some noname 32GB) to EXT4. It always hangs on step writing superblocks ... and always stops writing numbers after it reach to 125/256. I'm use command mkfs.ext4 ...
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How to shrink an ext4 /home partition without using a LiveCD and losing data?

I need to shrink an ext4 /home partition (/dev/sda9) to make space for something else. I would prefer avoid live CDs (boot troubles with new EFI and. I don't have a CD/USB in hand in the office). I ...
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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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Is it possible to unmount the /home partition?

I want to recover some files in my home directory using extundelete http://sourceforge.net/projects/extundelete/ This tool needs to unmount the device before start to work, but I cannot umount ...
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What algorithm is used by Disk Utility encryption?

What encryption algorithm is used by the partition encryption function of Disk Utility?
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fsck on ext4 resulted in file corruption

I had to hard reboot my machine and I had a file system corruption. I have tried to run fsck on the partition from live CD. However my partition is ext4 and I understand that fsck defaults to ext2 ...
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318 views

Where are drivers located for rEFInd?

I am planning to recompile my kernel with EFI Stub support, but currently my Ubuntu installation's partition is formatted with ext4fs. I have the rEFInd ext4fs driver (ext4_x86.efi) in the refind-bin ...
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Why aren't my drives fscking [duplicate]

I logged on to my Ubuntu server and the message of the day contained these wonderful messages: *** /dev/sda1 will be checked for errors at next reboot *** *** /dev/sda6 will be checked for errors at ...
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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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Can I disable updatedb.mlocate?

On ubuntu server here and I'm trying to unpack 300M image files from a compressed file format using Java. My unpack rate is 0.5Mbytes/sec, abysmal (34 days to unpack 1.5TB at this rate). I'm trying ...
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Changed Partition from NTFS to EXT4 and owner is set to root

I just changed the file-system of one of my partitions to be able to install games from steam on it. It is now ext4 and Owner is set to root, I can not create any folders there or do anything with it. ...
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Is it safe to defrag ext4 file system using e4defrag?

My file system partition is 90GB, and now 75% of the space is free after removing 53GB of recovered files using photorec from my home directory. I just want to know, is it safe to defrag the whole ...
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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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My NTFS and ext4 partition mounts as read only

After upgrading some packets (that I don't know what), my ext4 partitions are mounted as read only: m@mpc ~ $ sudo mount /dev/sda5 /mnt mount: warning: /mnt seems to be mounted read-only. My NTFS ...
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ext4 to btrfs conversion: how long can it take? space requirements?

I started btrfs-convert for my ext4 partitioned hdd. I did a fsck first which was fine. So since it is running over 4 hours now (1.) I wonder if it will ever finish ? I read multiple articles ...
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Installing Ubuntu 12.04 LST along windows without formatting any drive

I am facing a problem while installing ubuntu along with win8. The specs about my pc are following: 500 GB HDD (c:100, d:100, f:50, g:100 h:100 i:50) and every drive has important data, and are NTFS ...
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Does ubuntu one synchronize extended file attributes?

Ext3 and 4 filesystems, if mounted with that option, support extended file attributes with which you can add metadata to your files: author, ACLs, and actually whatever you want. Does Ubuntu One ...