I want to format a disk in ext3 file system with the block size as 4096. Is there any possibility to do so? What if we do not write Inode Bitmap while formatting?
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ext2/3/4 do not support disk block sizes greater than the page size. On x86-32 and x86-64, the page size is 4K, so that's the largest block size you can use. (OTOH, if you can dig up a DEC Alpha machine, I hear those had 8K pages.)
From your comment, you want to speed up mkfs. There are a couple of approaches you could take:
If you really want to reduce the number of block groups (which you shouldn't), there is a