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Old 7th September 2013
pb91 pb91 is offline
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Default Basic problem


a basic problem I can not solve.

It's OpenBSD 5.3 generic on a laptop Dell Latitude 510.

I have no problem to mount usb stick.

However, for an external drive (1 To, SATAII) on usb I have this:

The drive appears recognized.
# disklabel sd1
type: SCSI
disk: SCSI disk
label: EARX-32N0YB0    
duid: 0000000000000000
bytes/sector: 4096
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 15200
total sectors: 244190646
boundstart: 0
boundend: 244190646
drivedata: 0 

16 partitions:
#                size           offset  fstype [fsize bsize  cpg]
  c:        244190646                0  unused                   
  i:        244190208              256  ext2fs
But it is impossible to mount.
# mount -t ext2fs /dev/sd1i /mnt/usb1
mount_ext2fs /dev/sd1i on /mnt/usb1: specified device does not match mounted device
Does anyone have an idea?

Last edited by ocicat; 7th September 2013 at 07:29 PM. Reason: Please use [code] & [/code] tags when posting command output.
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Old 7th September 2013
shep shep is offline
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One thought is that if the drive is being used out of the box is that it is likely formated with an ntfs windows file system. Most usb sticks are formated with msdos/msdosfs/vfat file systems.
Newer usb hard drives tend to arrive preformated with ntfs and would remain so unless you had reformated, perhaps in a linux system.

More info is here.
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Old 7th September 2013
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jggimi jggimi is offline
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Join Date: May 2008
Location: USA
Posts: 6,221

Hello, and welcome!

When a drive does not contain an OpenBSD disklabel, OpenBSD will create a pseudo disklabel in memory, based upon the drive's MBR partition table, if there is one.

Your MBR partition table apparently has a partition that begins at sector #256 that is set to partition type 0x83, used by Linux.

Unfortunately, OpenBSD's list of supported Linux filesystems ends with EXT2 or EXT3 filesystems. It cannot mount EXT4, ReiserFS, or other Linux filesystems.

This is why the pseudo disklabel interprets a Linux MBR partition as "ext2fs" even if it isn't -- because only EXT2 or EXT3 (which is EXT2 plus logging) are supported.

Last edited by jggimi; 7th September 2013 at 08:18 PM. Reason: clarity
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