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I use UBIFS for rootfs. I would like to check the size of each direcotries in /.

When I checked with du command, it shows larger than mtd size. Would you tell me the way how can I check the correct size of each directories?

detail

$ du -sh /
508M /

Physical Erase Block (PEB) is 128KB. Logical Erase Block (LEB) of UBI is 124KB.

mtdinfo command shows as follows:
mtd4
Name:                           rootfs
Type:                           nand
Eraseblock size:                131072 bytes, 128.0 KiB
Amount of eraseblocks:          3664 (480247808 bytes, 458.0 MiB)
Minimum input/output unit size: 2048 bytes
Sub-page size:                  2048 bytes
OOB size:                       64 bytes
Character device major/minor:   90:8
Bad blocks are allowed:         true
Device is writable:             true

Amount of eraseblocks is 458MB, but du command shows 508MB. It is strange. Why du shows larger size?

added

$df -h
Filesystem      Size  Used Avail Use% Mounted on
ubi0:rootfs     400M  274M  126M  69% /
devtmpfs         89M   28K   89M   1% /dev
tmpfs           249M  144K  249M   1% /run
tmpfs           249M  156K  249M   1% /var/volatile
user8257918
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