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

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ext4 superblock checksum?

I'm reading the ext4 superblock, but its s_checksum (offset 0x3FC) is always zero. Also the s_checksum_type (offset 0x175) field is zero as well, however according to ...
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3answers
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Is there any way to restore EXT4 partition

Is there any way to restore ext4 partition after formatting the entire hard disk then making two partitions of NTFS
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1answer
303 views

How to stop jbd2 to release a device

In an AWS EC2 instance, we have multiple EBS volumes. When I try to detach any of them, the umount command works, but the device can't be detached. # grep -c xvdj /proc/mounts 0 However, lsof ...
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6k views

Multiple partitions for an external USB hard drive used by Linux and Windows

I want to split a large external USB hard drive into at least 2 partitions. I've heard that multiple partitions on a USB drive involves problems not associated with partitioning a regular IDE/SATA ...
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2answers
622 views

Recover Hard Drive Accidentally reformatted from NTFS to Ext4

So me and my friend were installing Arch Linux on my external hard drive. My external hard drive had no data on it, ready to roll. My friend had partitioned my external hard drive (I am positive that ...
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25 views

GParted shows false partition information after resize2fs of ext4 partition

I expanded my mdadm RAID 5 from 5 to 6 4TB disks and grew the raid. That all worked well. After I tried to expand the ext4 filesystem in GParted, which failed because of the 16TB limit. Afther the ...
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35 views

How do I use an Ext4 partition from Windows with correct file permissions for Linux?

I use Windows 7 and ext2fsd to access a data partition which uses ext4 as mentioned here, here and here. I can read and write from Windows. When I boot into Linux, it is able to read the files but ...
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34 views

about CentOS 7 apps & Driver [closed]

im using pc for several years but never tried Linux so im quite noob in this field. im using Autodesk maya, Nuke & will learn houdini very soon. i found that linux works faster for this apps so ...
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27 views

Filesystem fails when trying to boot Arch from USB pendrive

Lately I was trying to make bootable pendrive with Linux Arch. Following "Begginers guide" from wiki.archlinux.org, I made it, using syslinux as my bootloader, however, it doesn't work properly. ...
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1answer
27 views

Moving a partition without gparted [duplicate]

I need to move (shift) an ext4 partition on my disk in a headless Linux machine, like this: Before: [######### Partition #########][- Free space -] After: [- Free space -][######### Partition ...
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1answer
39 views

Understanding metadata usage behavior in a newly converted btrfs filesystem

I have a 5 TB hard drive with 3.3 TiB (as reported by du) of media files in 119k files and directories; the average file size was about 28 MiB. I converted the ext4 partition into btrfs with ...
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1answer
29 views

Recover specific files from a damaged hard drive

I'm trying to recover some 3-5GB of NEF files which were not yet backed up at the time of the crash. This is a 418GB ext4 partition and when mounted with -o ro,noload I can list the directory where ...
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8answers
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How to read ext4 partitions on Windows?

Is there a way to read ext4 partitions from Windows? If so, what can I do?
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0answers
54 views

Resize encrypted lvm volume and reallocate the space to windows partition

Here's a diagram of my solid state drive's partition setup. sda sda1 - boot (ext4) sda2 - LUKS Encrypted Partition LVM Volume Group Swap Logical Volume (ext4) Root Logical Volume (ext4) Home ...
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1answer
84 views

Unable to mount corrupted (?) ext4 filesystem on usb hard drive (Ubuntu 14.04)

I have a 1 TB external USB hard drive from which I deleted the original NTFS partition and created an ext4 partition through gparted. I then started copying a 500 GB file onto the new partition, but ...
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0answers
69 views

Ubuntu 14.04 Desktop as local server - ext4-fs error

I have set an Ubuntu 14.04 as a local server. Also I have two identical hdds on RAID1, on md0. I have tested raid configuration and works ok. I installed virtualbox from the official website and keep ...
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0answers
24 views

Is copying files between two different file systems slower than between the same file systems?

I was wondering if copying files between different file systems (for example from ext4 to ntfs) is slower than copying to the same file system (from ext4 to ext 4). I also would like to know how does ...
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1answer
25 views

Is Filesystem relevant in SFTP?

I have a home server with an NTFS disk attached, and I use FileZilla to access the data on that disk. I have both Linux and Windows clients, and I was wondering if the data would still be accessible ...
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1answer
61 views

recovering scrambled ext4 partitions

My year old 3TB Seagate drive stopped working. The drive had 3 ext4 1TB partitions which hold almost 2 years of accumulated data. I was using it in a ubuntu server when the mounted partitions stopped ...
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How to defragment or minimize a “directory file” on ext4?

I have quite an old home directory on HDD. There were lots of files created and removed and now the size of /home/username is 995328 bytes. Please note, I mean the size of the "directory file" (every ...
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1answer
87 views

Ext4 USB stick gets corrupted again and again

I installed Debian Wheezy (No GUI/Desktop) on a 4GB USB stick (because the harddrive of the machine was defective, currently the slot is empty), but shortly after, I got an “Input/Output error” when ...
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2answers
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Creating ext4 partition from console

I have a volume /dev/sda1 (1.2 TB) containing an NTFS partition using 0.6 TB space. I want to make an ext4 partition in the remaining 0.6 TB space. I have not tried anything yet because I don't want ...
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31 views

What is the `fsck.ext4 -i` file format?

I have a usb hard-drive that I just reformated as ext4, but which will fail in r/w mounting after a few seconds, remounting in read only. dmseg and /var/log/syslog help me as they provide information ...
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3answers
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How can I mount an EXT4 USB drive on Windows 8?

I have a USB drive formatted as EXT4. How can I mount it in Windows 8? Ideas on other workarounds are appreciated as well!
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1answer
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Not able to drag an application into new sda1 HD?

My primary HD (sdb) is a SDD (Solid State Drive). I installed and formatted a new 300 GB drive (sda) to ext4. I am not able to drag an application.run file into the new sda1. Why? Because it need a ...
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2answers
3k views

Ubuntu doesn't start, how to repair its ext4 system-partition?

My netbook crashed while booting Ubuntu (I accidently removed a usb stick while booting) and now doesnt start anymore. It gives the following error and goes into an ash (BusyBox built-in) shell: ...
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2answers
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SSD seems to be read-only, nothing can be written to it (linux ext4 filesystem)

After two week of normal use my new SSD began to work strange. Now it seems that no file is written to it. An example: root@hooker3:~# mount |grep ssdhome /dev/sda3 on /ssdhome type ext4 ...
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17 views

Why is the Write Cache not set by default to enabled in Lubuntu 14.04?

Is there a reason why they have not enabled it yet? I thought ext4 was stable now. I am on a SSD if that matters.
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27 views

Partition for a non partitioned ext4

I have a large almost full disk that was written with a ext4 FS but without being first partitioned. I need to use it with a Windows 7 machine (via ext2fs), but I also have a Linux machine available. ...
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2answers
77 views

fedora 21 lets a user overwrite a file he does not have access to

I reproduced this problem on two fedora 21 machines. I would like that sqlite3 does not write the ~/.sqlite_history file. I couldn't find an option but said, no matter, I'll make it that it can't ...
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1answer
56 views

Which filesystem should be used for a dual-boot machine's storage? [duplicate]

I'm planning on setting a dual-boot machine with Windows (8.1) and Debian sitting on different partitions of an SSD. The problem here is my 1.5TB storage drive. I'm planning to use Windows and Debian ...
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Online, “Smart” Partition Manager with Full Ext4 Support?

Is there any partition manager for Windows that can manage (resize, move, etc.) ext4 partitions? Caveats: Resize must be smart when resizing from the beginning of the partition. Many partition ...
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1answer
564 views

mounted filesystem without journal. Opts: (null) while mounting ext4 fs

I am using Beaglebone black with NFS, I have formatted internal eMMC with ext4 filesystem, when i mount the file system using following command message popups telling filesystem is mounted without ...
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68 views

Does btrfs-convert preserve the disk's UUID?

I'm thinking of converting my / from ext4 to btrfs. Will the UUID change?
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20 views

How can I get Samba to close files immediately?

I've been experiencing a baffling disappearing file issue on my NAS since I first bought it, and only today after extensive testing do I think I have a handle on what exactly is occurring. I fear ...
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2answers
453 views

e2image restore file system metadata

I'm trying to recreate file system metadata on a virtual disk. I can save this metadata using e2image, and the e2image man page tells me I can use e2image -I to restore the file system. Unfortunately, ...
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1answer
2k views

Partition went read-only, how to mount it again?

Every now and then the partition of my Linux installation goes read-only. Since the computer is a laptop, I suppose it's due to some writing error caused by some harsh movement. Partition was mounted ...
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1answer
926 views

Why I cannot format a microSD to ext4?

I have a Toshiba Class 10 64GB microSD that I want to use in a tablet (Cyanogenmod 11) by formatting it ext4. So I did the usual thing (under Fedora 20): created a single Linux partition with sfdisk, ...
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1answer
36 views

How to check that all files in a file system are can be read without errors?

I'm using an external hard drive with an ext4 file system to make backups. The backup software I use (faubackup) copies the file hierarchy 1:1 into a timestamp-named folder on the hard drive, and ...
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52 views

How can I identify and read only free-space junk data from EXT4 partition?

I have cloned an EXT4 partition via raw dd command from a Galaxy Nexus phone. How can I identify and read only free-space junk data from the EXT4 partition? I need to recover some WAVE samples(I'm ...
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2answers
2k views

Finding out the time a filesystem was last mounted

I want to find out the last time a filesystem was mounted on Linux (Debian). Any help?
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2answers
2k views

How to format to NTFS my EXT4 partition on Windows 8?

I'd like to format one of my partitions to NTFS which is EXT4 at the moment and an ubuntu is installed on, that I don't need anymore. I can't see the partition in My Computer and I've never tried ...
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1answer
204 views

Unable to Create Files In Directory

There are lot of these kinds of questions on superuser, so I'll try and keep this quick by telling you what it's not: There is no application involved here. Just a user and a filesystem. I can login ...
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1answer
217 views

ext4 superblock backup locations are different from what is documented

When I format an ext4 filesystem the mkfs says: Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000 My sparse_super flag is ...
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2answers
64 views

Accidentally formatted ext4 partition

I have just formatted an ext4 partition to fat32 using gparted. I stupidly closed gparted before I realized that I might have been able to use the undo function. I am currently attempting file ...
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5answers
10k views

Stuck choosing between ext4 and ext3 for the file system

I was in the process of installing Ubuntu 11.10, but got stuck choosing which file system to use. ext3 and ext4; which is better for a personal desktop? If ext4 is better, will it work well on my ...
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1answer
597 views

ext4 fs not recommended for SSD's? Alternative FS [closed]

I read ext4 journalling fs is not good enough for SSD's by some anonymous posts. while phornoix review shows JFS, not a known FS for average Desktop user is considered best for SSD. I believe JFS is ...
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69 views

How to safely shred unlinked files on a Unix-based file system?

Scenario: After working with a confidential file (e.g. PDF a bank statement), you typed: rm my-confidential-file (or the famous Shift-Delete action in a GUI-based file browser such as nautilus) ...
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1answer
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resize2fs seems stuck at pass 3 (scanning inode table) - what to do?

I have a machine running Arch Linux (2010, I believe) with a 6TB RAID-5 array hooked up to a Highpoint RocketRaid 2320. I've been having issues with the RAID controller's drivers and the latest Linux ...