To show how many blocks is reserved type:
tune2fs -l /dev/sdb1 | grep "Reserved block count"
To disable reserved blocks (and free space) type:
tune2fs -m 0 /dev/sdb1
To show how many blocks is reserved type:
tune2fs -l /dev/sdb1 | grep "Reserved block count"
To disable reserved blocks (and free space) type:
tune2fs -m 0 /dev/sdb1