root@OpenWrt:/mnt/sdb1# ls
ls: ./share2: Stale NFS file handle
lost+found

root@OpenWrt:/mnt/sdb1# mount
rootfs on / type rootfs (rw)
/dev/root on /rom type squashfs (ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
tmpfs on /dev type tmpfs (rw,size=512k)
devpts on /dev/pts type devpts (rw,mode=600)
/dev/mtdblock3 on /jffs type jffs2 (rw)
mini_fo:/jffs on / type mini_fo (rw)
none on /proc/bus/usb type usbfs (rw)
/dev/sda1 on /mnt/sda1 type ext2 (rw,errors=continue)
/dev/sdb1 on /mnt/sdb1 type ext2 (rw,errors=continue)
root@OpenWrt:/mnt/sdb1# fdisk -l

Disk /dev/sda: 8508 MB, 8508145664 bytes
2 heads, 63 sectors/track, 131884 cylinders
Units = cylinders of 126 * 512 = 64512 bytes
Disk identifier: 0x0027bcca

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1      131885     8308704+   7  HPFS/NTFS

Disk /dev/sdb: 34.2 GB, 34288435200 bytes
170 heads, 33 sectors/track, 11937 cylinders
Units = cylinders of 5610 * 512 = 2872320 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       11937    33483268+  83  Linux

root@OpenWrt:~# fdisk /dev/sdb

The number of cylinders for this disk is set to 32700.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/sdb: 34.2 GB, 34288435200 bytes
64 heads, 32 sectors/track, 32700 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk identifier: 0x3da41a12

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       32700    33484784   83  Linux

Command (m for help): d
Selected partition 1

Command (m for help): p

Disk /dev/sdb: 34.2 GB, 34288435200 bytes
64 heads, 32 sectors/track, 32700 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk identifier: 0x3da41a12

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-32700, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-32700, default 32700):
Using default value 32700

Command (m for help): p

Disk /dev/sdb: 34.2 GB, 34288435200 bytes
64 heads, 32 sectors/track, 32700 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Disk identifier: 0x3da41a12

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       32700    33484784   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
root@OpenWrt:~# mk
mkdir       mke2fs      mkfs.ext2   mkfs.msdos  mknod       mktemp
mkdosfs     mkfifo      mkfs.ext3   mkfs.vfat   mkswap
root@OpenWrt:~# mkfs.ext2 /dev/sdb1
mke2fs 1.41.5 (23-Apr-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2093056 inodes, 8371196 blocks
418559 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
256 block groups
32768 blocks per group, 32768 fragments per group
8176 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
root@OpenWrt:~#
root@OpenWrt:~#
root@OpenWrt:~# mount /dev/sd
/dev/sda   /dev/sda1  /dev/sdb   /dev/sdb1
root@OpenWrt:~# mount /dev/sdb1 /mnt/sdb1
mount: mounting /dev/sdb1 on /mnt/sdb1 failed: Invalid argument
root@OpenWrt:~# mount -t ext2 /dev/sdb1 /mnt/sdb1
mount: mounting /dev/sdb1 on /mnt/sdb1 failed: Invalid argument

root@OpenWrt:~# e2fsck /dev/sdb
e2fsck 1.41.5 (23-Apr-2009)
e2fsck: Group descriptors look bad... trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/sdb

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

root@OpenWrt:~# e2fsck /dev/sdb1
e2fsck 1.41.5 (23-Apr-2009)
e2fsck: Group descriptors look bad... trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/sdb1

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

root@OpenWrt:~#