Cannot see ext4 partitions

[notooth]

Hi everyone,

I cannot see the ext4 partitions on my HDD. Please help.
[pre]

$ sudo disklabel sd1 
# /dev/rsd1c:
type: unknown
disk: ST2000LM003 HN-
label: 
duid: 0000000000000000
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 3876021
total sectors: 3907029168
boundstart: 0
boundend: 0
drivedata: 0 

16 partitions:
#                size           offset  fstype [fsize bsize  cpg]
  c:       3907029168                0  unused                   
  d:       3907029168                0  unused                   
  e:       1999997953             2048  4.2BSD      0     0    0 
  f:       1907028144       2000001024     ccd     

[/pre]

[jggimi]

Please post the output of $ sudo fdisk sd1 for us.

[notooth]

Here it is:
<pre>

$ sudo fdisk sd1
Password: 
Disk: sd1       geometry: 258401/240/63 [3907029168 Sectors]
Offset: 0       Signature: 0xAA55
            Starting         Ending         LBA Info:
 #: id      C   H   S -      C   H   S [       start:        size ]
-------------------------------------------------------------------------------
 0: 83      0  32  33 - 132275  47  63 [        2048:  1999998976 ] Linux files*
 1: 07 132275  48   1 - 258401  95  63 [  2000001024:  1907028144 ] NTFS        
 2: 00      0   0   0 -      0   0   0 [           0:           0 ] unused      
 3: 00      0   0   0 -      0   0   0 [           0:           0 ] unused    

</pre>

[jggimi]

I assume you're now using OpenBSD, as you posted in an OpenBSD subforum.

The disklabel does not match the MBR partition table. You must either manually edit the disklabel to match, or you must have OpenBSD disregard the disklabel on disk so that OpenBSD will re-read the MBR table and re-create a disklabel based on the MBR. For the latter, please see the -d option in the disklabel(8) man page.

[jggimi]

In case I was not clear:

• You have a disklabel on the drive, which does NOT match your MBR partition table.
• To replace that disklabel with one that does, you merely need to use the -d option (ignore the on-disk label) and the -w option to write a standard disklabel. If there is an MBR on the drive ... and there is, the MBR table will be used to create the disklabel partitions.

Therefore, use # disklabel -dw sd1 and as if by magic, your new disklabel will look something like this:

#                size           offset  fstype [fsize bsize  cpg]
  c:       3907029168                0  unused                   
  i:       1999998976             2048  ext2fs                   
  j:       1907028144       2000001024    NTFS

[notooth]

Hi jggimi,

I followed your guide:

$ sudo disklabel -dw sd1

$ sudo disklabel sd1
# /dev/rsd1c:
type: SCSI
disk: SCSI disk
label: ST2000LM003 HN-M
duid: c1747308bf9d28ef
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 240
sectors/cylinder: 15120
cylinders: 258401
total sectors: 3907029168
boundstart: 0
boundend: 3907029168
drivedata: 0 

16 partitions:
#                size           offset  fstype [fsize bsize  cpg]
  c:       3907029168                0  unused                   
  i:       1999998976             2048  ext2fs                   
  j:       1907028144       2000001024    NTFS                   

$ sudo mount -t ext2fs /dev/sd1i /mnt/Storage1
mount_ext2fs: /dev/sd1i on /mnt/Storage1: Read-only file system

I could not mount the Read-only file system

[J65nko]

As far as I know OpenBSD can only mount ext2fs and ext3fs.

ext3fs is ext2fs with added journalling. If an ext3fs filesystem is not mounted and/or used by Linux then OpenBSD can use it. The journal will be ignored.

[jggimi]

EXT 4 must be mounted read-only.

9.5 - Accessing your Linux files from OpenBSD

OpenBSD supports the EXT2 file system for read/write, and can read EXT4. For further information, see FAQ 14.

Try using "-r" on the mount(8) command.

[notooth]

I can mount it now. Thank you very much