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

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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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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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19 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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1answer
38 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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2answers
39 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
61 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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1answer
28 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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13 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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1answer
25 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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51 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
295 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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2answers
54 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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1answer
104 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
44 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
242 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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1answer
337 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
89 views

Recover LVM with software raid

I have a Synology NAS using SHR mode, which is basically LVM and Raid 5. Somehow my LVM volume became corrupted and won't mount anymore. This volume houses over 20TB of data, and most of it is NOT ...
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1answer
34 views

How many actual files were you able to store in a CentOS folder? [on hold]

I found many questions about the total files limitations of the CentOS file-system, but I was curios in actual real-world situation, how many files people were able to store in one single CentOS ...
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4answers
424 views

How to copy files from one computer to another without losing any metadata?

Similar to but more demanding than this question : How to copy files while not modifying the file creation times at all? I want to copy files between computers without the "Modified" and "Created" ...
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0answers
182 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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1answer
123 views

How to shrink an ext4 partition from Windows?

My system has three primary partitions: two NTFS (one "system-reserved") for Windows 7 and one ext4 for Linux. How can I shrink the ext4 partition from Windows? I've tried the built-in Disk ...
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0answers
51 views

Is it possible to recover ext4 journal state before inode corruption? [on hold]

First of all I'll describe my situation: I decided to make some partitions cleanup, resize, etc (not creating damn backup). Then I wanted to shrink filesystems, so I closed computer and booted some ...
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724 views

Forcing ext4lazyinit to finish its thing?

Is there any way to 'force' ext4lazyinit to finish the thing it does with maximum priority? Something like "I don't care about my system's ressources, just do your job as fast as you can"? I should ...
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1answer
44 views

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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1answer
368 views

Restoring data from lost NTFS partition?

I had 3 NTFS partitions (C,D,E) on my old laptop running Vista. I wanted to install Ubuntu on the system partition C, i.e. over-write Vista, but keep D,E which were storage partitions. Stupid moron ...
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167 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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120 views

Ext4 allocation pattern with random writes in sparse file

If I create a large (a few GB) sparse file in ext4, and then write randomly throughout the length until all 4k blocks have been "touched", in the absence of other heavy write load, can I expect that ...
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2answers
3k views

Convert ext4 hard drive to ntfs fromat without formatting

I have a 1TB external hard drive with about 800gb data of ext4 format. Is there a way of converting it to ntfs format without having to format hence losing my data?
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166 views

How to run exe files on an ext4 partition using Paragon ExtFS under Windows 7

I've tried Paragon's ExtFS to mount an ext4 partition under Windows 7. I could open documents like PDF files without any problem, and creating and deleting files seems to work well, too (I've only ...
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0answers
24 views

Install e2fslibs 1.41

I have to use extundelete for my debian, but it requires e2fslibs 1.41. The command apt-get install e2fslibs-dev installs 1.42 version that is not compatible with it. How to downgrade? I'm usingh ...
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1answer
123 views

I accidentally formatted the wrong volume - is it possible to restore the previous Ext4 filesystem?

I know that a similar question has already been asked. This morning I accidentally formatted the wrong volume, containing mostly video files (about 30GB each). I am currently trying to restore the ...
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3answers
508 views

Can a large number of (small) files degrade the performance of a filesystem?

I'm working on an archival project and currently I'm storing 514600 images (ranging from 200kb to 2mb) on my 4TB NAS drive. The drive itself is formatted as ext4 and I'm writing the files over the ...
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1answer
164 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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35 views

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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1answer
661 views

Segmerntation fault when running extundelete on Ubuntu - what to do?

I have a partition raw image on which I am trying to run extundelete to undelete some files from an ext4 filesystem. Unfortunately extundelete exits with a segmentation fault. Is there anything I can ...
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19 views

How much data needs to be written to format a drive for ext3 / ext4?

If formatting a hard disk with mkfs.ext3 or mkfs.ext4, how many mb's will be written per mb space formatted?
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2answers
438 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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1answer
948 views

After deleting lots of large files, free space increases with a large delay

Yesterday, I have deleted 71 GB of files on my home/media server. Free Space before: 117 GB Free space after: 126 GB So, instead of having 71 GB of additional free space, I only had 9 GB. I have ...
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1answer
71 views

Changing fstab options

What happens when file-system options in fstab are changed? Speaking of an already populated file-system, would changing options in fstab cause issues? For example, if one were to enable or disable ...
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334 views

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

I've 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 see ...
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1answer
768 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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2answers
451 views

Is there anything faster than `find . | wc -l` to count files in a directory?

Not uncommonly I have to count the number of files in a directory, sometimes this runs into the millions. Is there a better way than just enumerating and counting them with find . | wc -l ? Is there ...
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1answer
80 views

ext3 vs ext4 bonnie++ rand/seq create speed

I am testing the difference between ext3 and ext4 for our application. When I run both filesystems through a bonnie++ test, the results for file creation on ext4 aren't very good. While ext3 can ...
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2answers
902 views

Shrinking ext4 partition: fdisk won't allow to recreate the partition at the same start block

Last time I shrank a partition, it was just as easy as deleting it and recreating it from the same start sector. But this time, fdisk won't allow to recreate the partition from sector 63, it forces ...
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1answer
874 views

How do I mount vhd disk to Ubuntu (Hyper-V)?

I use windows server 2008r2 with role Hyper-V. The guest system is Ubuntu 12.04 LTC. It is situated on the dynamic virtual hard disk VHD1. I add another VHD2 disk as SCSI. Now I want to mount this ...
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1answer
28 views

EXT and other filesystems

Is it true only NTFS needs to be defragmented? Are filesystems like ext4, 3 and 2 immune to fragmentation issues. Apple never seems to require a defragmentation so what makes some filesystems immune ...
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220 views

Contiguous physical allocation of a set of files in linux filesystem (ext4)

I have a set of files that I wish to be allocated contiguously in the filesystem. I will be accessing all these files sequentially in a single read one after the other and I want to optimize reading ...
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1answer
196 views

EXT4 external hard drive for use with multiple systems

I recently bought a external hard drive to store some data on. I use Linux but I am not a power user. If I format the drive to EXT4, is it possible for the permissions to ever screw up and I lose ...
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39 views

A file system operation that would incur a seek/rotational cost

I am looking to generate a workload that will do operations on a file system that will make the disk access to have rotational or seeking cost. Env details: partition size: 30 G. File system : ...
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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 ...