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

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eMMC Standards and File System support

I am looking into Android secure erase functions and realized a few things: Android uses eMMC as its storage media, eMMC standards are set by the JEDEC organization (currently most of the ...
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Rescue data from ext4 ISO image?

so, my SD card got broken and cannot be read completely (escpacially the directory I want to read from has problems). I was able to create an ISO image of the partition using dd but cannot mount it. ...
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How does the number of files in the same folder affect I/O performance in an ext4 filesystem

I'm using Kyoto Cabinet (a key-value store) for my project. The specific type of DB I'm using is DirDB which creates a lot of files in a directory to store the key-value pairs. The server I'm running ...
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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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Linux: Should off-site backups be stored in ext3 or ext4?

We have been using ext3 for Linux server off-site backups. With everything else on CentOS 6 being ext4, I'm wondering if it would be a better idea to also have the off-site backups in ext4 too? The ...
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Linux shows several folders with the exact same name

I recently used a mac to copy several files and folders to a USB drive (ext4 through ExtFS), and now in Linux (Xbian) two folders in the root of the drive are shown four times. The output of "ls ...
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How do I read the Ext4 partition of my SD card on Windows? [duplicate]

I have a 32 GB SD card with one FAT32 partition and one Ext4 partition. If I mount the SD card to the computer I can read the FAT32 partition in Windows just fine. But how do I read the Ext4 ...
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setting system time at startup from ext4 filesystem

I have a pc with no battery backup and using ubuntu 12.04 with ext4 it will constantly ask me to handle the situation by saying that my superblocks last write is in the future. So I wonder - can I ...
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I have an ext3 iso disk image. Can I use it and write it to a ext4 partition?

Is it possible to do so ? I am migrating to EXT4 because of the SSD drive that has TRIM funtion. I have to have ext4 partion.
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populated hard disk partitioning/moving (a lot of operations) [closed]

I have a HHD which is actually a mess. I would like to organize it and exclude some partitions I don't want to use anymore. Positioning the HD partitions beautifully require moving entire partition to ...
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1answer
355 views

ext4 integration in windows 8 - access through explorer

I know there are similar questions; however none I could find that addressed accessing ext4 through explorer, most others simply use a third party application. However, my question is; is there a way ...
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930 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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Is it safe to disable ext4 journaling on root and home partitions?

On my ArchLinux laptop I have / and an ecryptfs encrypted /home partition formatted with ext4. Both contains importand (backuped) data. Is it safe to disable ext4 journaling when partitions contains ...
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172 views

Weird behaviour on ext4 dd performance test

I'm testing the performance of ext3/ext4 on a raid1 system (but the same goes for a non raid system). The results from bonnie++ give a distorted image because they circumvent the delayed allocation on ...
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800 views

rm -rf extremely slow & slows down server

I did a rm -rf foldername in an attempt to delete a folder containing 10,000s of 25KB files. Question Why is it taking so long (Almost 30 minutes)? Why did the server became extremely slow, even ...
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169 views

How do I add additional locations to the Windows 7 Recycle Bin Properties?

I have set up a home network with a small file server running Samba. I read on a forum post that by re-mapping a user folder on Windows 7 to a network drive, a reference to that drive will be added ...
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158 views

FreeNAS 8 and ext fs

i'm trying out freenas8 for my personal NAS, i have lots of data that was in an ubuntu server, but somehow i never got the file sharing right. on freenas things just worked. i installed on usb, tried ...
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ext4 on mdadm reverting data

I have a problem with my home server setup. The problem is that sometimes, but really rarely, it reverts (for a lack of a better term) all my data back to an earlier state (somewhere between months ...
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Do ext4 filesystems need to be defragmented?

Do ext4 filesystems need to be defragmented? If so, how do I defragment them? If not, could you post a simple explanation of why they do not need to be defragmented?
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329 views

HDD is preventing ubuntu from installing

I have recently attempted to install ubuntu on my laptop, replacing windows 7. The HDD was working fine with windows 7. On my first attempt to install ubuntu it kept giving me an error that was ...
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119 views

Setting up Fedora alongside Windows 8 with special considerations

I've recently found myself much more comfortable using the console and other tools on my Mac than their counterparts with Windows. Specifically, these tools include LaTeX/xindy, emacs and its load ...
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364 views

extundelete does not finish its work

I need to restore a file on sda7 so I remounted ro und startet extundelete manuel@P5KC:~/recovery/RECOVERED_FILES$ sudo extundelete --restore-all /dev/sda7 WARNING: Extended attributes are not ...
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Disable journaling on ext4 filesystem partition

I'm running Linux Mint on an SSD. I've read how one optimization is to disable journaling. However, when I run the command: sudo mke2fs -t ext4 -O ^has_journal /dev/sda1 I get an error saying that ...
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293 views

Linux fine tuning for Vertex 3 SSD

I've been reading about optimizations for SSD disks on Linux, there is lots of info out there although very confusing and most feel outdated so I'd be grateful if someone sheds some light on the ...
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HDD bad sectors with OS [closed]

I wonder is that possible for OS to make bad sectors on Hard Drive? Preface: I have bought new HDD on 1Tb WB Caviar Black. I have installed new OS on ext4 partition Ubuntu 12.04.1 LTS. After few ...
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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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Why doesn't Ext4 cache directory size?

Once again I'm cleaning up my desktop because I'm running out of HDD space and everytime I call 'du -sh ~', it takes a really long time to calculate the current size of the directory. From my ...
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1answer
760 views

How to resize extended partition?

I have primary partition with Windows XP on it. Also I have extended partition divided into 3 logical partitions: - Drive D: for Windows - Ext4 Linux System - Swap Now, Linux is my main system, and ...
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from XEN to VMWare

I have migrated many xm virtual machine to vmware Using http://www.zoobey.com/index.php/resources/all-articles-list/268-xen-to-vmware , migrations were very smooth. But now I am struck in a xm ...
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What is EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10770, 0 clusters in bitmap, 32768?

On my Ubuntu Server 12.04 I got this errors (via dmesg): [ 1104.544121] EXT4-fs error (device md0): ext4_mb_generate_buddy:739: group 10771, 0 clusters in bitmap, 32768 in gd [ 1104.549227] EXT4-fs ...
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Fastest way to convert an ext4 formatted disk to LVM with ext4 on it?

I'm currently doing cp -aR to copy data from my (99% full) 1TB ext4 formatted disk to a new LVM-with-ext4-on-it disk. It's taking forever. Is there any way to attempt to "convert" the disk in place? ...
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Parted has no 'resize' command available

I'm trying to resize a partition using parted, but it has no the 'resize' command available gchain@archbogchain@archbook:~$ sudo parted /dev/sdb GNU Parted 3.1 Using /dev/sdb Welcome to GNU Parted! ...
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Reverse lookup of inode/file from offset in raw device on linux and ext3/4?

In linux, given an offset into a raw disk device, is it possible to map back to an partition + inode? For example, suppose I know that string "xyz" is contained at byte offset 1000000 on /dev/sda: ...
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Mounting a remote disk image which I made local via sshfs? Possible?

The core question first: Is sshfs fit to provide low-level reads/writes/seeks as required when a file contains blockdevice-like contents? Why? Well... I am trying to locally mount a filesystem-image, ...
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844 views

Slow rm performance on an ext4 partition

Removing what seems to me to be a moderate number of files takes a very long time. For example: $ pv linux-3.0.16.tar.bz2 | tar xj 73.2MB 0:00:16 [4.55MB/s] $ pv linux-3.0.16.tar.bz2 | tar xj 73.2MB ...
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Is file creation durable on ext4?

On some filesystems, when creating a file, it is necessary to call fsync() not only on the file itself, but also on the parent directory, to make the file creation durable. Otherwise, the directory ...
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How long can file system writes be cached with ext4?

A while ago, there has been some discussion about ext4 potentially leaving empty files after an unclean unmount, summed up pretty well in this article. Basically, because of delayed allocation, writes ...
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zram trimming by writing zero pages

I'm using ZRAM as a backing block device for /tmp filesystem in the following manner: echo 8000000000 > /sys/block/zram0/disksize mkfs.ext4 -O ...
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EXT4-fs error (device loop0) ext4_mb_generate_buddy

I've been randomly getting theses in my /var/log/messages [5747511.945300] EXT4-fs error (device loop0): ext4_mb_generate_buddy: EXT4-fs: group 1: 29505 blocks in bitmap, 29455 in gd Not had any ...
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western digital caviar black. EXT4-fs error

Recently I update my HDD on desktop machine, and bought WD Caviar Black. But after I format & copy information to it (using dd), and fix partitions size: I have next errors in kern.log: Aug 27 ...
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Quick way to empty a partition

I have a partition, formatted ext4, that I want to empty completely. I will be repeating this write-then-empty process repeatedly, so I want the emptying step to be as quick as possible. One option ...
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How to mount read-write an ext4 partition on Windows?

I want to use ext4 on my external HDD, but it must be cross-platform. (At least Linux, Win7 & WinXP). Unfortunately, I haven't found any proper driver allowing Windows to WRITE to ext4. I've ...
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445 views

On Linux allow a file to be read/write but not deleted

Is there a way in Linux on a ext4 file system that I can make a file readable and writeable but not deletable? The directory that the file resides in still needs to be writeable by the owner of the ...
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1answer
2k views

Is there a tool to browse files on a VMware virtual disk w/o starting a virtual machine?

I am looking for a way to browse through a VMware virtual disk in order to extract/copy files that are located on an Ubuntu EXT4 partition that is allocated on that disk, without the need to actually ...
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Having trouble with EXT4 on LVM on software RAID 5 (corruption)

Here's the quick and dirty of my problem. I'm using Lubuntu 12.04, Xubuntu 12.04 and plain Ubuntu 12.04. Tried with generic kernels 3.2.0-25 and 3.2.0-26. This issue persists on all 3 variants which ...
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Dealing with different usernames when mounting removable media in Linux

I have a laptop in which my username is, say, "foo". I have an external drive, formatted with Ext4, for which all files are owned by "foo" (at a filesystem level). Now, I have a desktop in which my ...
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Are there any reasons why I wouldn't want to format a USB flash drive in HFS+ for Linux/Mac usage?

There have been other questions regarding the use of HFS+ formatted drives on Linux (e.g. this); however, I am specifically interested in knowing if this is a good idea for a particular purpose. I ...
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639 views

How could I easily pack a directory to an ext4 loop partition image?

I would like to pack the content of a directory into an ext4 partition image easily, without mounting a loop device. Background: I am building a version of Android which will mount system partitions ...
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543 views

Hard drive partition size wrong. How do I resize without loss of data?

$ fsck fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) The filesystem size (according to the superblock) is 610471680 blocks The physical size of the device is 536870911 blocks Either the ...
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463 views

Cannot mount harddrive from HP ProBook via SATA-USB adapter

I'm trying to mount harddrive from HP ProBook 4525s to another computer for data backup from damaged laptop. There are two ext4 and one swap partition on hdd. I'm using SATA-USB adapter, but after I ...