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

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How to give Windows partions' file execute permission

I have installed Linux Mint 17 and Windows 8, as dual boot. 500GB hard disk has 5 partitions. Two of them are NTFS and the other 3 are ext4 partitions. When I log into Windows, I can not see any ...
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2answers
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How can I capture a consistent snapshot of a directory and all its children?

We have an application that periodically backs itself up to a directory on the local file system. Inside this directory are several more files and directories. I want to produce a "snapshot" of all ...
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ext3 vs ext4 - same disk size, less usable disk space under ext4 comparing to ext3. why?

Files copied from ext3 filesystem do not fit on same size ext4 filesystem. How to reproduce: create two 1GB files, setup loop device for each, create filesystem one ext3, one ext4, mount, rsync ...
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1answer
36 views

Delay before new/modified file appears

I'm seeing two separate cases where there's a (random?) delay before a new or modified file appears. The first case is my Rails development environment: I modify a code file (in vim) and save it, ...
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1answer
360 views

Best parameters for ext4 filesystem to handle virtualbox disk images

I have ext4 partition, which holds disk image files VirtualBox works with. They all are fixed-size images (i.e. files never change their size). They are defragmented as much as possible (with ...
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357 views

How to put syslinux on an sd card

I would like to know how to put syslinux on my sd card and I have tried using extlinux. However, I keep getting the message Missing Operating System. Please help me.
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1answer
18 views

testdisk partition recovery

Looking to recover data/partition index from this disk.. ⚡ root@jg  ~  ls /dev/disk/by-label lrwxrwxrwx. 1 root root 10 May 4 21:06 4tb1 -> ../../sde1 drwxr-xr-x. 7 root root 140 May 4 21:06 .. ...
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456 views

Extended partition should have many filesystems

I need some related information on the following lines I found in an answer: A logical partition is a container for a filesystem (or an LVM volume or some swap space or a BSD partition or other ...
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510 views

No access to symlink folder on NTFS partition

I am using an NTFS parition for storing data I like to access both from Ubuntu and Windows 7. On my Ubuntu HOME partition, I like to link the folder Assets in order to access it from an application ...
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Problems with file system

I created a partition with EXT4 file system and when I'm writing in this partition frequently the Kernel return the following error: Jan 01 01:17:54 infobuffer360 kernel: r7:c0561280 Jan 01 01:17:54 ...
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53 views

Have I destroyed data on drive?

I stupidly ran the following command on an external ext4 USB disk, typing /dev/sdb instead of /dev/sda which was the new disk I was setting up: dd if=/dev/zero of=/dev/sda bs=512 count=100 These ...
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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 flags to specify “extents” mode?

I've formatted a new filesystem with and without extents feature just to understand how this feature works. However, when I look at the inode field i_flags I see that this field always has zero value ...
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182 views

Do ext(4?) filesystems intrinsically store newer data in a fashion that is more prone to corruption?

I recently had a corrupted ext4 filesystem throwing these errors: kubuntu@kubuntu:~$ sudo mount -t ext4 /dev/sdc2 c1 mount: wrong fs type, bad option, bad superblock on /dev/sdc2, missing codepage ...
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ext4 - An entire directory disappeared?

Okay, this has me totally stumped. Background: I'm working on a cryptanalysis homework, trying to break a vigenere cipher with a 26 character key (a shuffled alphabet). Even though there are some 403 ...
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175 views

Understanding ext4/jbd2 transactions

I'm trying to debug a bit of trouble I'm having with I/O latency on a system using ext4, but I'm a bit stumped in that I don't understand its journalling as well as I'd like to. What I'm wondering in ...
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Size Range of ext4 Filesystem Journal

The minimum and maximum sizes respectively for the ext3 filesystem journal are 1,024 blocks and 102,400 blocks. Similarly — what are the minimum and maximum sizes for the journal on an ext4 ...
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Many transient files on journaled filesystem?

Writing and deleting many files quickly I'm going to write many temporary files per second, over a sustained period. Each will be deleted after some milliseconds. Say we have an image processing ...
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CentOS 5.6 expand ext4 partition , have steps but parted shows as ext3

I have a Adaptec 5805 HW RAID card with a 6.3 TB RAID-6 array (partitioned via Parted GPT, all of which is formatted as ext4 on CentOS 5.6). I want to expand this to 7.5GB and from reading these are ...
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260 views

Mount from auto to manual and changing dir gives errors

I just installed Ubuntu 14.04 and am trying to mount my internal HD to a different location in the /home/username dir (auto-mount mounts it to /mnt/{uuid} ) But I ran into a problem. In Disks, when ...
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401 views

How to find orphan directory entries in a ext4 disk

This comes from a long story of trying to recovering a TrueCrypt volume from a hardware failure (thanks, WD). I ended up with an unencrypted 3TB image that had the files that I want to recover. ...
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jbd2 journal constant i/o

iotop reports a constant i/o about 3% of [jbd2/vda1-8], I think this is the journal manager for ext4. my fstab is: UUID=X / ext4 defaults,noatime,nodiratime 1 1 tmpfs /dev/shm ...
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How to limit ext4 filenames to only those filenames legal in FAT?

The ext4 filesystem allows some characters that FAT does not allow, such as :. This has caused me much grief in the past when trying to move files, especially as KDE will delete such files instead of ...
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1k views

Superblock corruption on every boot

I have a Linux Mint 12 install on my laptop. Yesterday I powered it off like I always do and this morning when I started it I was greeted by an error screen. (Translated from Swedish) Fatal ...
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Mapping a physical sector to a filename

I just finished using ddrescue to recover the contents of a failing hard drive. It was able to recover everything but two sectors. How do I figure out which files (if any) occupied those sectors? ...
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ETX4-fs error on startup

Hi everybody, today I run dmesg and at the bottom I found some error lines about the device mmcblk0p2. Everything works fine even with those errors but I'd like to understand the problem. I've ...
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106 views

Red Hat Enterprise Linux 6.5 remounts root filesystem read-only after hibernating

I have a Lenovo ThinkPad T430 running Red Hat Enterprise Linux 6.5, kernel 2.6.32-431.30.1.el6.x86_64, and my filesystem structure consists of a master LUKS partition holding two logical volumes, one ...
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Find duplicity files after using PhotoRec

I've partly formatted a disc where my duplicity files was stored. I have used PhotoRec to recover the files but now they're all unsorted and without the correct filename. I have the files separated by ...
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189 views

What does the 'barrier' mount flag mean in Linux?

The manual for the 'barrier' mount option is: barrier=0 / barrier=1 This disables / enables the use of write barriers in the jbd code.barrier=0 disables, barrier=1 enables (default). ...
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143 views

Optimization for an SSD?

I am running Fedora 20 on a Laptop ( Lenovo Ideapad Yoga 2 Pro ) with an SSD. My filesystem is LVM with ext4 as the format option. I am now running Fedora as the only OS on the system with Legacy BIOS ...
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182 views

Formatting external USB Harddrive ext4

What is the best way to format a non-ssd harddrive with ext4, for as fast as possible usage with a very low performance computer? I mean, options like disabling things (journaling, ...) that slow ...
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How to blacklist bad blocks from a MD-raid + dm-crypt + ext4?

I have a ext4 partition, on top of a dm-crypt, on top of a MD-RAID 10. One partition (/dev/sdc1) dropped out of the array with a ton of read errors. I ran the manufacturer provided diagnostic tool ...
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Disk partition emptied during tar backup

This morning I was doing a routine backup of my development drive, one of 4 primary partitions on my hard-drive. The script I ran was: filename="/home/Backups/Devi_"`eval date +%Y%m%d`".tgz" touch ...
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How can I delete data from in a hexdump file from one offset to another?

I've created a disk image which was zeroed, formatted to ext4 file system, and then had several various files copied to it. I'm trying to extract these files using a combination of xxd and dd, but ...
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365 views

Howto configure autofs to work with usbsticks formatted with differend filesystems

I have some USB-sticks using fat32 as filesystem and others using ext4. Now I want to configure autofs to mount the sticks automatically. To make sure that the user can write to fat32 sticks I use ...
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EXT4 Journaling - Problem

Basically my root (/) ext4 partition keeps being mounted as read-only when I apply internal journaling feature. I understand that this should be default, but today I had been trying to apply external ...
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ext4: How to save free blocks / inodes to a file

I'd like to save all free blocks / inodes from an ext4 file system to one or more files for further analysis and file recovery. It would be good to create one file for every contiguous set of free ...
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e2fsck repairing an ext4 file system - how to enforce ext4 features?

I have a huge (1.5 TB) corrupted disk with an ext4 fs. The master superblock (and journal) are corrupt, so I am trying to repair it using e2fsck -f -b 7962624 -y /dev/sdb1 Now, the first thing ...
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Repeated Ext4-fs error with comm psad: invalid block. Does it mean the SSD is dying?

Configuration : Debian Jessie with SSD. /dev/sda1 is root filesystem, /dev/sda6 is home filesystem. Errors occurs only on /dev/sda1. For the third time, I've got software errors because the root ...
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can I boot ext4 usb stick with xubuntu on from a Mac laptop?

is there a way to boot my ext4 formatted "xubuntu" USB memory stick from a Mac laptop? The laptop can identify FAT32 usb memory sticks with ubuntu at boot time, but it cannot identify mine, which is ...
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Difference between fsarchiver and dump

What is the difference between dump and fsarchiver? Are there features in dump which are not covered by fsarchiver? Can both backup to tape storage for example?
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find the cause of file corruption when copying files to a network share on an Ubuntu machine

I am copying files from my SD card to my Ubuntu server via Windows 7 using a network drive. The problem is that sometimes, 2 files out of 150, are corrupted during transfer. See here 2 example files ...
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Debian..Can't format and mount external HDD

I have been trying to format my 640GB external Hard Drive in command-line and can't seem to get it working. I have done the following in order: sudo fdisk /dev/sda (Deleted any partitions, created ...
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60 views

Restoring data from NTFS formatted pre-ext4 partition

MS recovery just formatted my 1TB Backup disk to NTFS which was ext4 before. It was an MBR disk before but now it's a GPT one. Now I'm on SystemResqueCD and can check with the testdisk. What is the ...
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Getting partition boundary error when using GPARTED

I am trying to allocate my hard disk with below set of partitions using GPARTED. /dev/sdb1 - 256 MB /dev/sdb2 - 2048 MB With free space preceding as (4 Mb) between partitions. After applying the ...
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643 views

Good Bye lvreduce, hello lvresize?

I've found a couple of times that using lvreduce, (first unmounting, shrinking ext4 with resize2fs, and fsck'ing) ends in: mount: wrong fs type, bad option, bad superblock on ...
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ext4 data recovery from gparted error

During resizing and moving 2.7TB partition in Gparted, I encountered an error that froze the whole program. (I dont have a screenshot or output from it, as fas as I remember, it was something about ...
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e2fsck -y /dev/sda changed my 6TB disk into 1.8TB

After problems with mount I run e2fsck -y -b BLOCK /dev/sda and it was running for 3 days on 6TB raid 0, when it completed this was the output: /dev/sda: ***** FILE SYSTEM WAS MODIFIED ***** ...
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livecd-tools - ext4 errors

I'm using livecd tools to build an ISO image customized to my liking. It appears to build fine, but after booting up, I get a bunch of ext4fs errors indicating referenced inodes were deleted. My ...