mount_ext2fs: /dev/sd1i on /mnt: specified device does not match mounted device

[Zielonykid123]

Hello, I just tried to mount my EXT4 partition with following command: `mount_ext2fs sd0i /mnt` but I got a message: "mount_ext2fs: /dev/sd1i on /mnt: specified device does not match mounted device". I also checked the dmesg and I can read there: "ext2fs: unsupported incompat features: 64bit". I can mount that file system on FreeBSD and Linux but on not on OpenBSD, why?

[jggimi]

EXT4 support has been available in a limited fashion since 2014.There are two limits:

1. The filesystem must be mounted read-only.
2. The filesystem must not have been formatted with the EXT4 "64bit" option.

These limits are due to requiring EXT2 compatibility. Sorry.

[Zielonykid123]

Originally Posted by jggimi

EXT4 support has been available in a limited fashion since 2014.There are two limits:

1. The filesystem must be mounted read-only.
2. The filesystem must not have been formatted with the EXT4 "64bit" option.

These limits are due to requiring EXT2 compatibility. Sorry.

So i can mount only ext2 and as read only, right? Can you give me an alternative for ext4? I want to store my data on it.

[jggimi]

Generally, FAT32 is recommended for speed and ease of use, if individual files are under 4GB in size. EXT2 or EXT3 (mounted as EXT2) are recommend when individual files are over 4GB.

Here's the foreign filesystems that can be mounted through mount(8):

EXT:

You can mount EXT2. You can mount EXT3, but the EXT3 journal will not be used -- it will be treated like EXT2. EXT4 read only and w/o the 64bit option.

FAT:

FAT12, FAT16, and FAT32 are all fully supported, with the access control ownership set through the mount point or per the -u option of mount_msdos(8).

NTFS:

Can be mounted read only. See ntfs_3g below.

Here are two additional foreign filesystems that can be mounted through third party packages. These are slow, due to using Filesystem in USErland ("FUSE"), but provide additional options:

ntfs_3g: This package provides NTFS read/write mounts.

exfat-fuse: This package provides exFAT read/write mounts.

[Zielonykid123]

Originally Posted by jggimi

Generally, FAT32 is recommended for speed and ease of use, if individual files are under 4GB in size. EXT2 or EXT3 (mounted as EXT2) are recommend when individual files are over 4GB.

Here's the foreign filesystems that can be mounted through mount(8):

EXT:

You can mount EXT2. You can mount EXT3, but the EXT3 journal will not be used -- it will be treated like EXT2. EXT4 read only and w/o the 64bit option.

FAT:

FAT12, FAT16, and FAT32 are all fully supported, with the access control ownership set through the mount point or per the -u option of mount_msdos(8).

NTFS:

Can be mounted read only. See ntfs_3g below.

Here are two additional foreign filesystems that can be mounted through third party packages. These are slow, due to using Filesystem in USErland ("FUSE"), but provide additional options:

ntfs_3g: This package provides NTFS read/write mounts.

exfat-fuse: This package provides exFAT read/write mounts.

Okay, EXT2 would be nice for me. Thank you.