time mke2fs -c -c -m2 -LTest -j /dev/hdb2
mke2fs 1.38 (30-Jun-2005)
Filesystem label=Test
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
13516800 inodes, 27015030 blocks
540300 blocks (2.00%) reserved for the super user
First data block=0
825 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872

Testing with pattern 0xaa:         5650240/       27015030