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

learn more… | top users | synonyms

0
votes
1answer
495 views

Use IOzone to check read/write performance of ext4 and btrfs?

Can someone help me to use IOzone filesystem benchmark tool on Ubuntu to check the performance of ext4 and btrfs filesystems? I have installed Ubuntu into a VM.
1
vote
3answers
4k views

Ext4 constantly mounts as read-only

I'm at a complete loss, here. After only using my computer for short periods of time (often less than a minute), my root partition (Ext 4, /dev/sda5) become read-only without warning. This happens ...
0
votes
1answer
248 views

Formated xfs partition to ext4 by mistake, can it be recovered?

I formatted a xfs partition by mistake to ext4. Can this be undone and the data recovered? Actually, I did not chose to have the partition reformatted during installation, I just kept the default ...
1
vote
0answers
605 views

Can't recover formatted Ext4 partition file system. :( Suggestions?

I've been at this for days now, so I'm hoping you can help me! Original setup: This is a 200GB firewire drive, originally formatted via Ubuntu 11.04 Disk Manager with a Master Boot Record, and a ...
2
votes
1answer
775 views

Recovering a file after having formatted from NTFS to EXT4

I used to have windows 7 but I've recently formatted my hard drive to install kubuntu and I've just realized that I forgot to backup a hidden .dat file which defines my bitcoin wallet. Is it possible ...
0
votes
1answer
4k views

how do i format my hard drive to ntfs from ext4 [duplicate]

I have a usb with my windows ISO loaded and ready. Problem is there is no ntfs partition on my hard drive for windows to load onto. I don't want to complicate things by running 2 operating systems. ...
3
votes
2answers
3k views

Superblock set in the future, fixing system clock

I keep getting errors messages about my Superblock mount time being in the future, and insisting on doing fsck on every boot and I have to go in from the recovery options to do this every time. Here ...
0
votes
1answer
690 views

Change root file-system type (LVM)

I have an Ubuntu 13.04 server configured in this way: % df -TPh ...
2
votes
0answers
17 views

Is there a way to find the LBAs for free blocks in ext4

tune2fs can show the number of free blocks. Is there a method/tool to find the actual logical block addresses for each free block? Thanks in advance
1
vote
1answer
2k views

How to recover files from a partition that was previosuly NTFS under Wndows but after Ubuntu installation had been converted to ext4?

I had accidentally installed Ubuntu 13.04 on Windows 8 while trying to Dual Boot. I had a single partition(973GB) which had windows with NTFS filesystem. But by the accidental install of ubuntu the ...
0
votes
1answer
428 views

How to mount EXT4 drives from another system

I had a testbed 13.04 server which had a boot volume partitioned into three, root, swap and Workspace as well as two other drives running in raid 1. The Workspace and raid volumes were setup using LVM ...
0
votes
2answers
2k views

Trying to mount backup of /dev/sda as ext4 for recovery, fdisk reports invalid partition table

I used dd if=/dev/sda of=~/backup.img where /dev/sda was an ext4 filesystem. I want to perform recovery on it which means I need to mount it as ext4 filesystem using extundelete application. Can ...
5
votes
2answers
8k views

Do I use ext4 for all partitions (such as / and /boot)? What are the other formats used for?

I'm installing ubuntu onto a new laptop with 24gb SSD and a 500gb HDD. I wanted to put / and swap onto the SSD and /home onto the HDD. Is there anything I shouldn't use ext4 for? I do not ever intend ...
0
votes
1answer
1k views

Can not install Ubuntu (13.04 / 12.04) due to ext4 error

I was trying to install Ubuntu 12.04 LTS Desktop 64bit Edition on my new PC. (1TB SATA HDD) I set my mainboard to use BIOS to boot up. At first I tried installing next to Windows 7, got errors. Now I ...
1
vote
1answer
3k views

EXT4 Filesystem seems to have disappeared

I previously had an LVM consisting of a few different drives, including two 4TB Seagate USB's. I migrated my data off the drives. Copy -> Shrink -> Copy -> Shrink Once the drive was removed I ...
1
vote
2answers
504 views

sha256sum/md5sum gives different results for big files (Ext4/Full disk Encryption)

Yesterday I reinstalled Ubuntu 13.04 64-bit on my computer (4GB RAM), and for the first time I decided to use Full Disk Encryption (all default settings). Today while running backups my computer ...
4
votes
0answers
156 views

How to format an external drive to ext4 in Ubuntu 13.04 [duplicate]

In Ubuntu 13.04 the Disk Utility has been renamed to Disks and has a completely new interface. Using this new version of Disks I want to format my external hard drive to ext4, but the answers to this ...
0
votes
2answers
155 views

Shrinking down ext4 partition not working, Oracle VM (W8 host / Ubuntu 13.04 guest)

I've been trying to follow a myriad of directions all to no avail. I have a 49.4gb drive that is only using 12.1gb of space. I would like to reduce this drive to 20gb in order for it to be used on a ...
0
votes
1answer
658 views

e4defrag - what does output mean?

e4defrag shows many lines like (filename) 100% [ OK ] or (filename) 0% [ NG ], and at finish shows success/failures. Does NG mean it was not moved, OK means it was defragmented? What are the ...
3
votes
2answers
4k views

How can I change permissions on external drives right after formatting with GParted? [duplicate]

Using GParted, I have formatted an external HDD to ext4. As it turns out the default is that I have no write access. How can I change permissions on external drives?
1
vote
1answer
865 views

Mount error on new, empty External HDD - ext4

Apologies if this seems like a very similar question to others already on the site. I have searched for a few hours now for solutions, but nothing seems to be quite the same. I recently (2 days ago) ...
1
vote
1answer
124 views

Is IT possible to make a ext4 external HD completely open?

I bought a new external HD in order to use it like a usb key to exchange files between different computers, and I formatted it using ext4 The problem is that everytime I upload some files I have to ...
2
votes
1answer
2k views

very high IOWait + extremely slow hdparm -tT

I have been running 12.04 on my Fujitsu Siemens Lifebook E751 for almost a year without any problems, and then several days ago I noticed a very high CPU IOwait that makes the system poorly responsive ...
0
votes
1answer
451 views

Simple way to recover a deleted file in a sub-dir of an encrypted home directory (ext4 file-system)

I need a simple way to do it, such as one command or program to which: specify the directory the file was in ask for the list of the recoverable files found specify which files have to be undeleted ...
0
votes
1answer
115 views

Does the freequent use of CAT command badly affect the hard disk performance?

One the programs I've written requires merging many files into one, every 3 seconds. The merged file can be bigger than 1GB. I'm using cat command to do this. Cat seems to work pretty fast even ...
0
votes
1answer
465 views

noexec option enabled in fstab is not getting applicable for limited user. Is it a bug?

noexec option enabled in fstab is not getting applicable for limited user. Is it a bug? cat /etc/fstab # / was on /dev/sda2 during installation UUID=fd7e2645-3cc4-4c6c-8b1b-016711c2fd07 / ...
2
votes
5answers
10k views

Ext4 file system format drive does not show in Windows 8

To install Ubuntu 13.04 I formatted a drive with Ext4 file system format. After format I can't open the drive from windows 8 Explorer. Whenever I try to open the drive following error shows : Thanks ...
1
vote
1answer
139 views

Does the length of a filename change the amount of space it takes up?

Using a ext3 or ext4 file system, assuming that the files have similar checksums, would the following files: 8c87dba9cf4dbc27c0d54083311ffeef6821e8426f5a8d50165d84f5eef80103.npz 1.npz Take up a ...
2
votes
1answer
327 views

Using Ext4 partitions on external storage

If I want to use a USB flash memory or an external hard disk to transfer data and at the same time I want to use ext4 partitions on them. How could I do that without getting problems regarding ...
1
vote
0answers
361 views

Why's Clonezilla not able to complete the backup of my HDD (ext4)

I have a single HDD with one single partition. What I need is to make an entire backup image of it and burn it to a DVD so that, in case of a messup, I can restore the entire HDD, as it was before. ...
1
vote
3answers
4k views

Converting my C:\ to NTFS from EXT4

I was playing with my computer attempting to install Ubuntu 12.04.2 LTS i386, and I accidentally converted my C:\ with Windows on it to EXT4, and Windows hangs on boot. All of windows is still on the ...
2
votes
2answers
91 views

Can I have two internal disks - one ext4 and one ntsf?

Can I have two internal disks - one ext4 and one ntfs? I am putting together a small home server with ubuntu desktop. I also want to use it for windows 7 backups, so if I install a ntsf hdd as well ...
1
vote
1answer
4k views

ext4 partition works but fdisk shows no valid partition table

I have a 1TB disk with a single ext4 partition. here's some output of parted print all command Model: ATA Hitachi HDS72101 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/4096B ...
3
votes
3answers
228 views

Amount of data written on a partition

Is there any way to find out how much data have been written on the partition since it was created? Talking about ext4 fs.
0
votes
1answer
680 views

Does copying files from NTFS to EXT4 degrade/corrupt the files?

The reason I ask is I am very new to Ubuntu, but I want to get into mobile development. I installed Ubuntu alongside windows 8 but it just doesn't run quite as well as I would expect so a friend ...
19
votes
1answer
25k views

How to expand the ext4 primary partition size in a VMware Player virtual disk?

I have a VMware Player virtual machine setup, running Ubuntu 10.04 as the a guest OS. The VM was created on a 20GB virtual drive, with a single partition for working space. Finally I got to the point ...
0
votes
1answer
259 views

Resize ext4 /home partition from start sector

I need to resize my ext4 /home partition to make space to my boot partition before it. The thing is to do so I need to change the start sector of my home partition (the boot partition is extended on ...
2
votes
1answer
228 views

Ubuntu and fat partition, why and can I change it?

I have a mac from 2006 and it is already not supported by new Apple system. So I did get back to Linux and I did chose Ubuntu 13.04. I did install Ubuntu side by side with OSX, but I did notice that ...
0
votes
1answer
358 views

ntfsresize -b -f not working chkdsk /r freezing

I've got a failing hard drive. Don't have the funds atm to buy a new hard drive. So I need to hold up. My main operating system is now ubuntu which is able to run the hard drive fine without any ...
1
vote
2answers
3k views

How to backup Ubuntu partition via Windows?

I wanted to make a backup of my Ubuntu (12.04) partition before upgrading to 13.04, but I've come up against a snag. None of the tools I can find can make an image of the currently-mounted drive - ...
-1
votes
2answers
1k views

Hide ubuntu partition in win7 [closed]

I was searching forum but I didn't find solution to my problem. I've installed Ubuntu 13.04 and Win7 on one HDD in UEFI mode. I'm able to boot in both OS'es separately from grub (added some entries). ...
1
vote
1answer
290 views

Hard Disk Formatting Error

so here is the situation.. I installed Ubuntu, pretty sweet.... all was going well till i tried to install an application " LPCXpresso IDE for ARM micro controllers" now the PC hung up as soon as the ...
1
vote
1answer
726 views

Cannot format USB drive to ext4 [duplicate]

i'm trying to format USB drive (some noname 32GB) to EXT4. It always hangs on step writing superblocks ... and always stops writing numbers after it reach to 125/256. I'm use command mkfs.ext4 ...
0
votes
1answer
1k views

How to shrink an ext4 /home partition without using a LiveCD and losing data?

I need to shrink an ext4 /home partition (/dev/sda9) to make space for something else. I would prefer avoid live CDs (boot troubles with new EFI and. I don't have a CD/USB in hand in the office). I ...
2
votes
1answer
564 views

How do I fix my broken/damaged Kubuntu installation?

(I am dual booting Windows 8 and Kubuntu.) I've been having a lot of fun with Kubuntu. I've done a lot with it, including installing GNOME desktop, just to try it out. One day I was in Steam and I ...
1
vote
3answers
4k views

Is it possible to unmount the /home partition?

I want to recover some files in my home directory using extundelete http://sourceforge.net/projects/extundelete/ This tool needs to unmount the device before start to work, but I cannot umount ...
5
votes
1answer
298 views

What algorithm is used by Disk Utility encryption?

What encryption algorithm is used by the partition encryption function of Disk Utility?
0
votes
1answer
305 views

fsck on ext4 resulted in file corruption

I had to hard reboot my machine and I had a file system corruption. I have tried to run fsck on the partition from live CD. However my partition is ext4 and I understand that fsck defaults to ext2 ...
1
vote
1answer
331 views

Where are drivers located for rEFInd?

I am planning to recompile my kernel with EFI Stub support, but currently my Ubuntu installation's partition is formatted with ext4fs. I have the rEFInd ext4fs driver (ext4_x86.efi) in the refind-bin ...
0
votes
1answer
153 views

Why aren't my drives fscking [duplicate]

I logged on to my Ubuntu server and the message of the day contained these wonderful messages: *** /dev/sda1 will be checked for errors at next reboot *** *** /dev/sda6 will be checked for errors at ...