Linux – How to Determine Block Size of an ext3 Partition

Since it's recommended anyway to have backups before filesystem conversions, you'd better copy everything (do not forget file permissions) somewhere, create an ext3 filesystem on that partition, then copy everything back.

As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h:

du -hs * | sort -h

If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X:

brew install coreutils
du -hs * | gsort -h

From sort manual:

-h, --human-numeric-sort compare human readable numbers (e.g., 2K 1G)