A filesystem is a way to organize and store computer files with their data.

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Why isn't sda1 showing up in dev and how can I fix that?

I have an embedded Linux device and I was trying to copy some files to it. I plugged in a USB stick, the dmesg shows that it was recognized, but for some reason /dev/sda1 never showed up. I'm trying ...
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1answer
235 views

mkdir: cannot create directory: Function not implemented

I am in college and have to submit my cs homework from a school Linux machine, but I like doing the homework on my laptop (Mac). So instead of copying my files over every time, then submitting them, I ...
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1answer
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read only root filesystem

Somehow my Debian went to read only in root file system. I have no idea how this could have happened. For example when I am in /root folder and type command nano and after that press Tab to list ...
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Fix EXT4-fs bad geometry (block count exceeds size of device)

I have a micro SD card which has a FAT32 partition and an EXT4 partition. The EXT4 partition will no longer mount. dmesg shows the following error: EXT4-fs (sdb2): bad geometry: block count ...
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How to diagnose potential JFFS2 flash problems?

I have a large fleet of embedded ARM systems using the JFFS2 filesystem. Are there any particular commands or log file entries I can query to gauge whether they are having any corruption or other ...
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what is directory entry?

I have to use the dirent.h in some of my C projects. According to various different descriptions found online, I have come to a vague idea that directory entry is a data structure, which tells us ...
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2answers
2k views

What is “Ext'd (LBA)” in fdisk output?

This is my partition table. Output of fdisk -l Device Boot Start End Blocks Id System /dev/sda1 * 63 204796619 102398278+ 7 HPFS/NTFS/exFAT /dev/sda2 ...
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Corruption-proof SD card filesystem for embedded Linux?

Recently we had a rather unpleasant situation with our customer - Raspberry Pi based "kiosk" used to display remote sensing data (nothing more fancy than a kiosk mode browser displaying a ...
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9answers
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Mount Google Drive in Linux?

Now that Google Drive is available, how do we mount it to a Linux filesystem? Similar solutions exist for Amazon S3 and Rackspace Cloud Files.
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Give read-only access to specific folders?

I would like to give read-only access to a user but I want him/her to see only the exact folders I give access. for example he/she shouldn't travel around all the server and browse to all users ...
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1answer
36 views

Which file system is better for Ceph?

I've read the Ceph OS recommendations document, but still I have a question. Which file system is better for Ceph? XFS, ext4, or something else?
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1answer
656 views

How do I mount a UFS disk in read-write mode?

I have a system drive that has filled up to the last sector, so that it doesn't boot anymore. The file system is UFS (it's an old Freenas 0.7 installation), but since UFS write support doesn't appear ...
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17 views

unix2dos not recogonizing outfile

I typed unix2dos /path/to/filename_unix.txt /path/to/filename_dos.txt in the CentOS 7 terminal, but I got the following in response: unix2dos: converting file /path/to/filename_unix.txt to DOS format ...
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1answer
413 views

How can I get write access to my usb drives?

I have trouble writing to external drives. They are monuted automatically in Nautilus, but I can not copy anything there ('Paste' and 'create Folder' are just greyed out). Does Anyone have ideas what ...
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3answers
21k views

How can I expand ext4 partition size on debian

I have a drive with this configuration: fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size ...
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2answers
839 views

File system CRC check

I know that before running the kernel, u-boot (the boot loader) will check the kernel image CRC. Only if it is correct it will go further, else it will give a "Bad CRC" error. I want to do same thing ...
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Live shrinking of root partition has failed on Linux Mint

Steps taken: *Used fdisk to delete the existing root partition and created a new root partition (PV) starting on the same block *Added the 'a' flag using fdisk to make it bootable as /boot is under ...
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fopen problem when mounting ecryptfs filesystem

After an unrecoverable fsck problem the mount of my encrypted /home/me filesystem isn't possible any more. The visible effects are: a) logging in though most of the selectable GUI window managers ...
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1answer
25 views

Debian can't mount partition or external hd

I have recently installed a copy of Debian 7/Gnome in a partition along with Windows 7. Even though I am the sole user of this computer, during the installation two accounts have been created: a ...
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2answers
52 views

Linux File System for an External HDD

I'm looking for a file system for an external HDD which will be basically used for backups. It will only be used with Linux machines, so I don't mind having a Linux-specific file system. I may ...
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Querying an overlayfs

I'm looking for a way to query a mounted overlay filesystem (overlayfs) in order to check it's upper and lower directory, but until now I haven't found any suitable command for that. Is there is a way ...
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2answers
6k views

How to force drop all partitions and erase disk from terminal?

My question is in fact related to OS X, however I'm using Linux tools to resolve my problem. I'm trying to delete all the partitions on my SSD drive and create new GUID (HFS+) partition table. Native ...
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3answers
713 views

Trouble getting Exfat formatted drive to mount

I've just performed a new install of arch linux (3.15.3-1) on a macbook pro 8.2 All of my data is on an exfat drive, and I've installed exfat-utils. However, when I try mount -t exfat /dev/sdb1 ...
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How can I test if my /tmp “works”?

I had to delete some files and whatever, long story, I ran sudo rm -rf /tmp/. Now, on mac (might be universal, I'm not sure) it is a symlink to /private/tmp/. But my /tmp/ folder has a thumbnail ...
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Disparity between output of `fsck` and `df`

fsck shows /dev/sda1 is okay, and uses 3811/49152 inodes and 105570/171776 blocks. df -i and df show that /dev/sda1 uses 443/239944 inodes and 0/959776 KiB. GParted shows /dev/sda1 uses ...
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How do I layer compression on top of encryption on top of BtrFS, per-file?

BtrFS should support this really, but it doesn't. So ECryptFS looks like it will fill the gap. The only thing is, how would I layer compression on top of this? Reasons for compression on top of ...
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1answer
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What does `clean, x/y` mean in fsck output?

When I run fsck, I see output like: fsck from util-linux 2.25.2 e2fsck 1.42.12 (29-Aug-2014) /dev/sda1: clean, 3811/49152 files, 105570/171776 blocks Which I understand means everything is okay ...
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4answers
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Why is writing SLOW on raw device, and FAST on filesystem (USB key)?

I have a USB key (PQI U822V-Speedy 32G) that I am trying to benchmark quick'n'dirty on Linux. I'm testing write bandwith. dd on raw partition I created a partition starting at sector 2048, then did ...
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3answers
479 views

How to know if /dev/hda2 is Primary partition or Extended partition

If all four primary partitions exist on an IDE drive, they are numbered as follows: /dev/hda1 /dev/hda2 /dev/hda3 /dev/hda4 We have also the partitions on a disk with one primary partition and ...
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1answer
1k views

How to Free Up Space in a Dynamically Growing qcow2 VM image?

This has happened to one of my VM's that's running CentOS under Proxmox. I copied about 40 GB of data into a VM. I then deleted that 40 GB data a day later. Now taking a backup of the same VM takes ...
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FAT16 Basic Implementation [migrated]

I've been given 2k bytes to make a ultra minimalistic file system and I thought about making a stripped out version of FAT16. My only problem is understanding how do I store the FAT in the hard drive. ...
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How do I move all the files with the same name scattered through the file system into one folder?

I have a file system tree and on different locations within it are files with the same name. I tried the following command on the command line: find / -name "HAHA" -exec mv {} /home \; It only ...
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2answers
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Debian won't boot: udevd fails to load device sda and sdb

I can't boot my Debian system, I got this error during boot up: Driver 'pcspkr' is already registered, aborting. I have solved this by adding blacklist snd-pscp to /etc/modprobe.d/blacklist.conf ...
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4answers
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Is it possible to compress a very large file (~30 GB) using gzip?

Is it possible to compress a very large file (~30 GB) using gzip? If so, what commands, switches, and options should I use? Or is there another program (preferably one commonly available on Ubuntu ...
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34 views

Look at the bytes in a directory? [duplicate]

I would like to see what the actual contents of a directory file are (not the files that are contained within that directory). Specifically I would like to be able to do something like: od -c . ...
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38 views

/etc/fstab/ rw option is being ignored for mircosd card partition in ArchLinux

I have ArchLiinux Linux comp001 3.18.7-1-ARCH #1 PREEMPT Wed Feb 11 11:38:34 MST 2015 armv6l GNU/Linux for Arm installed on rPi and here is my /etc/fstab file: # # /etc/fstab: static file system ...
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How to pass local directory as drive in Windows+VirtualBox

Setup: Linux host + VirtualBox + Windows 7 guest. Currectly I use shared folders feature but it is too fragile, I see all phantom effects and on the other hand Windows have change file notification ...
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1answer
241 views

aufs with lower writable branch

I'm trying to hide some directories on a mounted file system (it's not about security, just aesthetics). I've mounted the file system regularly on /mnt/data and wanted to use aufs to overlay a ...
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1answer
27 views

“Ghost” files in ext4? (ktorrent allocated disk space)

I'm downloading with KTorrent, and have noticed that when I select "allocate disk space before starting torrent", it creates all the files at start, presumably empty, to avoid fragmentation. When I'm ...
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On which disk is a file located in a btrfs RAID-1 array/filesystem?

I have a btrfs array with 5 disks in RAID-1 mounted on /mnt/array: # btrfs filesystem show /mnt/array Label: 'nicefilesystem' uuid: censored Total devices 5 FS bytes used 4.95TiB ...
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Device files and drivers of a disk, partition, and filesystem?

In Linux, For a hard disk, there is a device file such as /dev/sda or /dev/hda depending on the interface type of the hard disk. Does the existence of its device file mean that the driver for the ...
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What is the meaning of the contents of /proc/net/unix?

On my Android device there is the file called /proc/net/unix who's content does not conform to that of any standard linux distribution (which show the unix domain sockets.) First few lines: Num ...
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3answers
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How to change partition UUID (2 same UUID)?

I have a fedora guest OS in VMware. I want to expand /boot partition, so I add another virtual disk to this VM, and try to clone the disk. After dd if=/dev/sda1 of=/dev/sdb1, blkid report that ...
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How to repair a corrupted HFS+ partition from a damaged hard-disk?

I have a friend's Mac OS X disk that comes with an HFS+ partition. I am supposed to recover the personal data from this disk, and I'm not yet sure if the filesystem is corrupted or the disk is dying). ...
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xfs_repair does not repair the filesystem according to xfs_repair -n

I've got a filesystem that, after a crash, is corrupted according to xfs_repair -n. As stated in the xfs_repair man page, xfs_repair -n exists with a return status 1 if corruption is detected. So I ...
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Calculating a File Offset [duplicate]

I would like to know how I could calculate the offset of a certain file in a certain partition. I have spent quite some time looking for an answer but couldn't find anything concrete. What I mean is ...
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ext4 corruption found in superblock, but filesystem can be mounted

After a crash, I've got an Ext4 filesystem (on an LVM LV) that gives the following error when running fsck.ext4 -nf: e2fsck 1.42.12 (29-Aug-2014) Corruption found in superblock. (blocks_count = 0). ...
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1answer
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Mounting a multi-partition (GPT/HFS+) USB 2.0 harddrive on Debian

I have a 3TB USB 2.0 hard-drive which has two HFS+ (Mac) partitions using GUID partition table for the partition records. It was partitioned with Mac OS Disk Utility. How can I mount these partitions ...
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1answer
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Don't I need to move a shrunk filesystem before resizing the partition?

I have a partition of size X GB filled by an ext4 filesystem. Now, I want to shrink this partition (and the filesystem) to only take up the latter X/2 GB. I'm using command-line tools and no parted. ...
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Why hard links not allowed to directories in UNIX/Linux

I read in text books that UNIX/Linux doesn't allows hard links to directories but soft links do. Is it because, when we have cycles and if we create hardlinks, and after some time we delete the ...