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The questions about default block sizes used in your Unix system are always popular. Today I'd like to show you a few ways to answer them.
Default block size in Linux
If you ever want to confirm the block size of any filesystem of Ubuntu or any other Linux OS, tune2fs command is here to help:
ubuntu# tune2fs -l /dev/sda1 | grep Block Block count: 4980736 Block size: 4096 Blocks per group: 32768