Extended File System
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FAQ
Reserved space
Check reserved space
tune2fs -l /dev/partition | grep 'Reserved'
Remove reserved space
tune2fs -r 0 /dev/sdd1
Reduce reserved space
Set to 1%
tune2fs -m 1 /dev/sdd1
Grow to partition size
Simply
resize2fs /dev/sdc1
Check minimum size for resize2fs
resize2fs -P /dev/sdc1
gives you the number of (usually 4096 byte) blocks