e2freefrag
Print the free space fragmentation information for ext2/ext3/ext4 filesystems. More information: https://manned.org/e2freefrag.
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Check how many free blocks are present as contiguous and aligned free space:
e2freefrag {{/dev/sdXN}} -
Specify chunk size in kilobytes to print how many free chunks are available:
e2freefrag -c {{chunk_size_in_kb}} {{/dev/sdXN}}
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