If there is a partition, ex.:
Then how can I increase the partition (with fdisk?), if it was 10 GByte before, and there are still place to increase the partition with another 10 GByte, so sum: how can I increase the partition's size from 10 GByte to 20 GByte? Without data loss! - so re-creating the partition is not a solution.
UPDATE: thought there will be a command to modify the partitions end to a new end, so yes, re-creating the partition is OK! :) the main thing is that data on the partition should stay untouched, without any copy here, than copy it back thing. :)