I formatted a partition using mkfs.xfs /dev/mydevice in Ubuntu and then I mounted it using /etc/fstab. When I type mount, it tells me that my device is mounted as ext3.
Output of mount:
/dev/mydevice on /mnt/mymount type ext3 (rw,_netdev)
First question: How do I know if it's xfs or ext3? What am I missing?
Second question: If it's xfs, how do I know if it's xfs-256 or xfs-512?
loading the device in a utility like gparted tells you FS types.
for fstab file it's enough, I think, to say only xfs.
Related
I need to mount a USB drive to an embedded system, running Linux. The USB could be in FAT, NTFS or ExFAT format.
How can i handle this in code so that I pass proper type in mount command such as
mount -t vfat /dev/sda1 /mnt
So I have tried mount with:
mount -t vfat,ntfs /dev/sda1 /mnt
This command gives invalid argument, but it successfully mounts the USB if USB is in NTFS or VFAT format. However if i try to give
mount -t vfat,ntfs,exfat /dev/sda1 /mnt
The command fails.
Any pointers will be really helpful.
From the mount manual page:
If no -t option is given, or if the auto type is specified,
mount will try to guess the desired type. Mount uses the blkid
library for guessing the filesystem type...
Is libblkid available for your embedded system?
Try:
mount -t auto /dev/sda1 /mnt
or
mount /dev/sda1 /mnt
And as mentioned in the comments, make sure the kernel on your embedded system supports exfat.
I'm trying to recover some data from a hard drive extracted from a broken laptop, and I'm having problems mounting the disk to my current system (Linux Mint). The hard disk I'm recovering from ran Debian. Simply, I'm confused as to how I can mount the hard drive to access the files, however it's not as simple as any other mount I've done. The following details struggles and information I've encountered.
I get the following outputs when trying to mount the hard drive with different file-system tags. I should add that the file-system type isn't automatically detected when using auto, and "sdb" is definitely the correct address for the disk (taken it from dmesg).
$ mount /dev/sdb /mnt/usb -t ntfs
NTFS signature is missing.
Failed to mount '/dev/sdb': Invalid argument
The device '/dev/sdb' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
The following returns the same message when all other common file-system tags are used:
$ sudo mount /dev/sdb usb -t ext2
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
The results from these commands led me to believe that there was an issue with the hard disk and it's partitions, however fdisk proved that it's partition's do seem to be valid and correct:
$ sudo fdisk /dev/sdb -l
Disk /dev/sdb: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002da94
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 475920383 237959168 83 Linux
/dev/sdb2 475922430 488396799 6237185 5 Extended
/dev/sdb5 475922432 488396799 6237184 82 Linux swap / Solaris
I then decided to try verify the file-system type of the hard drive, which seems to be "devtmpfs", which I got from the following command using df:
$ df /dev/sdb -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
udev devtmpfs 1014764 4 1014760 1% /dev
And so finally, I mount the hard drive using -t devtmpfs, which is successful in mounting however I'm left with a confusing file system very unlike from what I would expect from what was a standard debian set up.
It contains file folders such as "block","bus","char","disk","dri","mapper"... and files like "sda1","sdb","sdb1","tty","vcs".
I'm totally stumped as to how I should progress, and I'm pretty convinced the hard disk isn't broken and that I'm just mounting it incorrectly. How can I successfully mount the disk so I can access my files? Any help would be greatly appreciated.
Ok, you are trying to mount the entire disk instead of individual partitions, which is why you are getting the error. In short the command you need is:
mount /dev/sdb1 /mnt/usb
The file /dev/sdb references the entire disk as a block file. This includes the partition table at the start, which is why it can't find a filesystem. The file /dev/sdb1 references the first partition, which is where your filesystem will be. From the looks of your fdisk output, this is not an ntfs partition since this is a Windows filesystem and the partition is marked as Linux (most likely you will have ext4 unless you specifically set up something different).
To add a quick explanation of devtmpfs, this is a special filesystem which contains these block files which are specified by udev. You can google both for more information, but by now I'm sure you now know its not what you are looking for.
How to determine the type of file system on an SD Card (this card is not yet mounted. I need to determine the file system type so that i can mount the SDCard through a program according to the file system type)
Or from the terminal. For example "mount -t ext3 /dev/sdc1 /mnt"
You might do a file -s /dev/sdc1 and it could recognize the filesystem data.
And you might do mount -t auto /dev/sdc1 /mnt to have mount recognize it.
I'm partway through an installation of Arch Linux and, following the online instructions, I'm mounting /dev/sdb1/mnt.
When I input
mount /dev/sdb1/mnt
it returns
mount: you must specify the filesystem type
Using both auto and ext4 (my filesystem type, I'm fairly certain)
mount auto /dev/sdb1/mnt
I get
mount: mount point /dev/sdb1/mnt is not a directory
What is going on here?
You are missing a space:
# right here---v
mount /dev/sdb1 /mnt
The mount command wants a device and a directory. /dev/sdb1 is the device, and /mnt is the directory.
I make block device driver module and insert module on Ubuntu. And then I want to mount that module as file system using 'mkfs'command. But, mkfs command didn't work more with following message:
writing superblocks and filesystem accounting information
mkfs doesn't mount block devices. It creates filsystems on them. (I hope that there was nothing interesting on you device; mkfs has deleted the data on block device). To mount a block devices (or better to say to mount the filesystem that is on the blockdevice) you must use mount:
# mount /dev/sda1 /mnt
(presuming /dev/sda1 is the device you try to mount).
Don't forget to unmount the device when you need it no more:
# umount /mnt