Avatar billede fredand Seniormester
25. november 2020 - 19:53 Der er 1 kommentar

How to change dos to ext4 on a hdd?

Hello guys,
I try to format a hdd, but it keeps saying that I got a dos-partion on it.

My attempt below, what do you think guys is it possible?

pi@raspberrypi-NAS:~ $ sudo fdisk /dev/sda

Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): n
Partition type
  p  primary (0 primary, 0 extended, 4 free)
  e  extended (container for logical partitions)
Select (default p):

Using default response p.
Partition number (1-4, default 1):
First sector (2048-625142447, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-625142447, default 625142447):

Created a new partition 1 of type 'Linux' and of size 298.1 GiB.
Partition #1 contains a ext4 signature.

Do you want to remove the signature? [Y]es/[N]o: Y

The signature will be removed by a write command.

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

pi@raspberrypi-NAS:~ $ sudo tune2fs -L "seagate_320" /dev/sda
tune2fs 1.44.5 (15-Dec-2018)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Found a dos partition table in /dev/sda
pi@raspberrypi-NAS:~ $ sudo mkfs.ext4 /dev/sda1
mke2fs 1.44.5 (15-Dec-2018)
Creating filesystem with 78142550 4k blocks and 19537920 inodes
Filesystem UUID: ec7aad3f-858c-42c7-99f9-e82358fa282d
Superblock backups stored on blocks:
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616

Allocating group tables: done                           
Writing inode tables: done                           
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done   

pi@raspberrypi-NAS:~ $ sudo tune2fs -L "seagate_320" /dev/sda
tune2fs 1.44.5 (15-Dec-2018)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Found a dos partition table in /dev/sda
pi@raspberrypi-NAS:~ $

I also tried to not remove the signature

pi@raspberrypi-NAS:~ $ sudo fdisk /dev/sda

Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): n
Partition type
  p  primary (0 primary, 0 extended, 4 free)
  e  extended (container for logical partitions)
Select (default p):

Using default response p.
Partition number (1-4, default 1):
First sector (2048-625142447, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-625142447, default 625142447):

Created a new partition 1 of type 'Linux' and of size 298.1 GiB.
Partition #1 contains a ext4 signature.

Do you want to remove the signature? [Y]es/[N]o: N

Command (m for help): w

The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

pi@raspberrypi-NAS:~ $ sudo tune2fs -L "seagate_320" /dev/sda
tune2fs 1.44.5 (15-Dec-2018)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Found a dos partition table in /dev/sda
pi@raspberrypi-NAS:~ $ sudo mkfs.ext4 /dev/sda1
mke2fs 1.44.5 (15-Dec-2018)
/dev/sda1 contains a ext4 file system
    created on Wed Nov 25 19:47:39 2020
Proceed anyway? (y,N) y
Creating filesystem with 78142550 4k blocks and 19537920 inodes
Filesystem UUID: 88549ecb-3ff5-4265-aa8f-995ae457175b
Superblock backups stored on blocks:
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616

Allocating group tables: done                           
Writing inode tables: done                           
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done   

pi@raspberrypi-NAS:~ $ sudo tune2fs -L "seagate_320" /dev/sda
tune2fs 1.44.5 (15-Dec-2018)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Found a dos partition table in /dev/sda

The goal is to use this hdd from my PI.
What do you think guys, is it broken?

Best regards
Fredrik
Avatar billede fredand Seniormester
25. november 2020 - 20:07 #1
It looks like I solved it when using gparted, first added a label, then format to ext4
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