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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