Hi all, I'm having a problem with a SCSI driver... When I load the module (from dmesg) I see that everything has worked fine. and the output of fdisk -l shows the <SNIP> sudo fdisk -l Disk /dev/sda: 60.0 GB, 60022480896 bytes 255 heads, 63 sectors/track, 7297 cylinders, total 117231408 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000539c8 Device Boot Start End Blocks Id System /dev/sda1 * 2048 78125055 39061504 83 Linux /dev/sda2 78127102 82124799 1998849 5 Extended /dev/sda5 78127104 82124799 1998848 82 Linux swap / Solaris Disk /dev/sdb: 300.1 GB, 300101401088 bytes <-- this is the guy 255 heads, 63 sectors/track, 36485 cylinders, total 586135549 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xffffffff Disk /dev/sdb doesn't contain a valid partition table <SNIP> So i used fdisk on "sdb" to manually write the tables in and it succeeded <SNIP> Command (m for help): n Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): p Partition number (1-4, default 1): 1 First sector (2048-586135548, default 2048): Using default value 2048 Last sector, +sectors or +size{K,M,G} (2048-586135548, default 586135548): Using default value 586135548 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. <SNIP> THen i used mkfs to create a new ext4 partition and even that went fine. <SNIP> mkfs -t ext4 /dev/sdb mke2fs 1.42 (29-Nov-2011) /dev/sdb is entire device, not just one partition! Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 18317312 inodes, 73266943 blocks 3663347 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 2236 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group 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 (32768 blocks): done Writing superblocks and filesystem accounting information: done root@ocz-Not-Specified:/home/ocz/Shampavman/OCZ_XEN_Final_Source_code# echo $? 0 <SNIP> But then when i tried to mount it on /mnt things fail. <SNIP> mount -t ext4 /dev/sdb /mnt/test mount: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so ------------------------------------ dmesg..... [495515.858203] EXT4-fs (sdb): VFS: Can't find ext4 filesystem ---------------------------- <SNIP> ===================== Some pointers, While diving into this issue i figured out that the magic number on this device is not the same as "EXT4_SUPER_MAGIC" macro that is checked for in the super.c (fs/ext4/super.c) . Can anyone please help me in figuring out a solution for this.? Thanks