Formatting internal MTD storage: selecting block size?

I have rooted china N101-II tablet with CyanogenMod after flashing custom ROM . Internal MTD storage is 32 GiB large and custom ROM flashing make different layout to internal partitioning. Thus /data near 12 GiB instead of original 1 GiB (so thera are no longer need to move packages to external flash!!): 130|root@android:/system # df Filesystem Size Used Free Blksize /system 595.4M 549.8M 45.6M 1024 /data 11.8G 449.8M 11.4G 4096 /cache 126M 4.1M 121.9M 4096 Rest space left to /mnt/sdcard: root@android:/ # cat /system/etc/vold.fstab dev_mount flash /mnt/sdcard auto /devices/virtual/mtd/mtd9/mtdblock9 nonremovable but custom ROM flashing process left mtdblock9 unformatted. Under PATH available commands: mkfs.ext2 and tune2fs so I can format myself. mkfs.ext2 support: 130|root@android:/system # mkfs.ext2 --help mkfs.ext2 --help BusyBox v1.21.1-jb bionic (2013-07-01 01:04 +0200) multi-call binary. Usage: mkfs.ext2 [-Fn] [-b BLK_SIZE] [-i INODE_RATIO] [-I INODE_SIZE] [-m RESERVED_PERCENT] [-L LABEL] BLOCKDEV [KBYTES] -b BLK_SIZE Block size, bytes According to: root@android:/ # cat /proc/mtd cat /proc/mtd dev: size erasesize name mtd0: 00400000 00004000 "misc" mtd1: 00800000 00004000 "kernel" mtd2: 01000000 00004000 "boot" mtd3: 01000000 00004000 "recovery" mtd4: 18000000 00004000 "backup" mtd5: 08000000 00004000 "cache" mtd6: 300000000 00004000 "userdata" mtd7: 00400000 00004000 "kpanic" mtd8: 28000000 00004000 "system" mtd9: 46fa00000 00004000 "user" seems that I need to select block size as 16384 (16KiB). Am I right? **UPDATE** Seems that mkfs.ext2 from busybox and doesn't properly functioning: android# mkfs.ext2 /dev/block/mtdblock9 mkfs.ext2: lseek: Value too large for defined data type But I found mke2fs: android# mke2fs -I 16384 /dev/block/mtdblock9 mke2fs 1.41.14 (22-Dec-2010) mke2fs: invalid inode size 16384 (min 128/max 4096) In order to reduce fragmentation I try to select larger block size (which make lesser amount of erase operation on flash I hope): android# mke2fs -I 4096 /dev/block/mtdblock9 mke2fs 1.41.14 (22-Dec-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 1162128 inodes, 4651520 blocks 232576 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 142 block groups 32768 blocks per group, 32768 fragments per group 8184 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000