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

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Read operation in filesystem

I have a very dumb question. When a read operation is made, am I doing a write too? I'm thinking about write in journal area because my metadata are changed, like mac time. Is my thinking wrong? I ...
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NTFS Hard disk about to die, I only have another ext4 hard disk and want to backup on it

Is it possible? Right now i'm manually copying inside it, used ext2 Volume Manager to assign a drive letter to it. Is there any other way to do it? The ntfs is 1TB while the ext4 is 450. The ext4 is ...
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Can ext2fsd be used to turn a volume as NTFS?

I have a ext4 formatted hard drive. Could I plug it into my Windows system using ext2fsd, and turn it into NTFS using the following steps? Plug ext4 formatted drive into Windows using ext2fsd. ...
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10 views

ext4 recovery: superblock backup numbers

Good time of day! After a horrible failure of the HDD, I got myself in a situation where I cannot mount the disk - it complains about the superblock issues. I found a great article that describes how ...
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39 views

Windows displays old NTFS after partitioning disk for ext4 on Linux

I try to install a "shared" space between my Gentoo and my Windows10. So, in Gentoo, I used parted to remove all (NTFS) partitions from one of my drives and repartition it with ext4. I then mounted ...
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How to compress ext4 partition with Acronis while backup?

With Acronis, when I set to compress ext4 partition before backup, the result is a raw backup and not compressed. The same process with NTFS or FAT32 partition, results are compressed. Please tell ...
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27 views

Ext4 fs corrupted after shrunken by parted

I was trying to make room for an Arch Linux installation and I ran parted and shrunk my main Ubuntu partition. I made a new one in the new space but after I rebooted it put me in a grub prompt. I ...
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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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45 views

Root FS Read only: Remounting gives “cannot change data mode on remount” when not changing data mode

After messing with the settings in fstab, my root filesystem is being mounted read-only. I was able to solve this error in the past by running # remount -o remount,rw / However, I am getting the ...
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64 views

ext4 for data partition in Windows

I have moved my Windows user profile to a separate partition in order to share it with my linux install. I have originally tried to make a NTFS formatted data partition, but this creates some issues ...
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41 views

Linux Ext4 Filesystem Explanation Needed, 19 million One byte files equals 80+GB?

Here's the deal, I am dupe checking domains for my crawler, I have 145 million domains to dupe check on the fly. Storage Consumed: 80GB for 19 million files To do so, I am creating a directory ...
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1answer
5k views

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 ...
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1answer
12 views

Which namespaces of xattrs a non root user can set in android?

I know it isn’t possible to setsecurity.capabilitiesattributes without uid 0 or CAP_SETFCAP. However I was unable to find a complete list of what namespaces of names are allowed or what are those ...
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3answers
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8answers
243k views

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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343 views

Is there any way to access a Ext4 partition from Windows? [duplicate]

I dual boot my PC (Windows 8.1 and Ubuntu 14.04), is there any way I can access the Ext4 partition from Windows? I just need to read a couple of folders, nothing else.
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1answer
46 views

Does resizing an ext4 partition formats it?

I currently have my hard-disk divided in 3 ext4 partitions as shown in the image below. Now, recently I've been needing more space and I would like extend the sda2 by shrinking the sda1 and adding ...
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3answers
698 views

Cannot delete directory on Ubuntu 14.04.3 LTS

As you can see below the root user cannot remove myapp directory but can write and delete files in this directory. The filesystem is ext4. Is this a filesystem issue? Do you have any ideas on it? ...
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Will `tune2fs -E stride=X` have the same effect as `mkfs.ext4 -E stride=X`

The man tune2fs and man mkfs.ext4 state: stride=stride-size ... This mostly affects placement of filesystem metadata like bit‐maps at mke2fs(2) time to avoid placing them on a single ...
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abnormal behavior of the kernel jbd2 process

I want to understand the mechanism of the journal of the ext4 file system on partitions with no free space. When a process (apache-tomcat, in my case) keeps making small additions to debug log files, ...
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Moving 2TB (10 mil files + dirs), what's my bottleneck?

Background I ran out of space on /home/data and need to transfer /home/data/repo to /home/data2. /home/data/repo contains 1M dirs, each of which contain 11 dirs and 10 files. It totals 2TB. /home/...
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26 views

Use `extundelete` to Restore Single File

There is a file which I didn't delete but it went missing (see http://unix.stackexchange.com/questions/249894/files-just-go-missing-on-ext4-partition-within-truecrypt-volume). I don't know the full ...
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1answer
126 views

Manualy Clean Second Partition In Android Link2SD

I use Link2SD in my Android Phone to link some of my apps into external second partition. My external total size is 32GB and I partition it into 2 partition. First Partition is using FAT32, and the ...
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Will transfering a file between two different file systems incur generation loss?

I want to transfer few hundred GBs of .mkv files from my Linux ext4 file system to a NTFS formatted external hard drive and since I'm a multimedia major, I can't really afford to have any quality loss ...
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How far in the past extundelete can go?

Yesterday I've accidentally deleted files from ext4 partition. During this time some downloading was running. If the content cannot be recovered I would be glad just for file names which were deleted. ...
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What data on a filesystem are really affected by powerloss?

Let my filesystem be ext4 mounted with data=journal. I don't fully understand what happens during power loss with filesystem in this case. So I have the following questions: Under which ...
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Is file creation date visible and NTFS ADS metadata preserved on an EXT4 partition accessed via SMB?

I want to build a small backup server for my essential data. I'm interested in not losing any of the features that Windows/NTFS offers, like: File Creation Date ADS metadata(comments, tags, etc) ...
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142 views

How to intentionally corrupt an ext4 filesystem?

I want to intentionally corrupt a file on an ext4 filesystem for testing. Is there a way to corrupt it by, say, leaving a file open and then rebooting?
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706 views

Is it ok to limit writes on SSD/EXT4 by setting commit parameter in fstab?

I have installed an SSD on my / (Linux scv 3.8.0-34-generic #49~precise1-Ubuntu SMP Wed Nov 13 18:05:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux). If I leave the default settings in /etc/fstab I can ...
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30 views

best way to copy content of NTFS partition to ext4 partition

I have a 263 GiB NTFS partition (with no free space) and want to copy all its files to a ext4 partition, that can't be larger than 294 GiB. I also need to copy NTFS Junctions as some kind of link. ...
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2answers
120k views

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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34 views

Sanity check ext partition size?

I ran resize2fs on a ext4 linux partition and I want to create a partition after it. However I want to sanity check that the size I put into fdisk afterwards was correct. What's the best way to ...
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818 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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121 views

“Bad magic number in super-block” with external HDD ext4 partition

I have a self-powered external HDD plugged through USB to my laptop. I deleted the single partition it had, intending to create a new encrypted partition. But I started getting an error once I ...
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1answer
41 views

Harddisks aren't recognized in new system (ubuntu 14)

I used to have a small home server with two attached USB disks, both formatted as ext4. Now I bought some new hardware, took the disks out of their USB case and installed them in the new server. In ...
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1answer
31 views

Best method to copy big partition contents with many hard links

We had a LVM of almost 16TB with ReiserFS. We now want to add more disks, but we cannot continue using ReiserFS, as it has a maximum capacity of 16TB. This volume is being used to make incremental ...
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271 views

Someone please explain how I'm writing to EXT4 from Windows 8.1

I'm dual booting Debian amd-64 Wheezy 7.5 and Windows 8.1 I have 6 drives and I am 100% positive that four of the drives are formatted Ext4 (Formatted in Linux) How on earth is it that when I'm in ...
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2answers
8k 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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Sharing Folders over Network via EXT4 Dual Boot

This may be a complicated question, so I apologize in advance: Two computers on a home network: Tesla (dual boot linux Mint & Windows 10), Spitfire (Windows 10). Both have Kodi (XBMC). I want to ...
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106 views

Unable to get ext2fsd to start automatically

I dual-boot between Ubuntu and Windows 8.1, and I am currently using ext2fsd to access files on my Linux drive and my shared file drive when I am booted up on Windows. However, I cannot get ext2fsd ...
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2answers
766 views

Want to create an ext4 partition from windows 10

I want to create ext4 partition in my internal hard disk from windows 10. I have seen many questions but all of them mention to partition with external hard disk.I wanted partition in internal ...
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2answers
3k views

mkfs.ext4 errors

I've just installed Kali Linux and am working with an img file I created from dd (/dev/zero). When I go to do mkfs.ext4 on it, I get mkfs.ext4: Device size reported to be zero. Invalid partition ...
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39 views

Sync Microsoft OneDrive with a folder on EXT4 partition in dual boot scenario

I use Ubuntu and Windows 10 in dual boot scenario. As a student I received plenty of storage on Microsoft OneDrive and I would like to upload and sync my files. I primarily use Ubuntu and prefer to ...
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1answer
32 views

How to mount an ext4 filesystem with specific permissions?

I want to mount /home such that any user can read and write to his/her own directory but only a certain user has execute permission. We have a queue system (torque) and I want users not to be able to ...
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2answers
5k 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
192 views

Recovering data from two partitions, one NTFS, the other ext4

I have an external HD, and it had three partitions on it. One was a 4GB ext4 filesystem, and two others, 120GB NTFS and 120GB ext4. I created an image on the 4GB using the Linux utility dd on Fedora ...
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116 views

sfdisk geometry warning / how to repair

I have problem with superblock in an ext4 disk : usr@rpb ~ $ sudo fsck -v /dev/sda fsck from util-linux 2.20.1 e2fsck 1.42.5 (29-Jul-2012) ext2fs_open2: Numéro magique invalide dans le super-bloc ...
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2answers
4k views

Corrupted linux partition: EXT4-fs error loading journal

I have a Linux partition (Ubuntu 12.10 upgraded to 13.4) on a machine that originally came with Windows 7. Windows 7 was working unusually slow (still is, and was still running slow after ...
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Torrents downloaded with Deluge have started getting errors

Basically, while downloading (or more often after it's fully downloaded) deluge starts reporting an an error with the downloaded data. Status: file too short: reading p: 6690 b: 0 s: 262144 (read: 116)...