unsquashfs или mksquashfs, какая из утилит меняют данные?

segor@segor-Aspire-1640Z:~$ unsquashfs -s mtd5.img
Found a valid SQUASHFS 4:0 superblock on mtd5.img.
Creation or last append time Wed Aug  7 14:12:54 2013
Filesystem is exportable via NFS
Inodes are compressed
Data is compressed
Fragments are compressed
Check data is not present in the filesystem
Fragments are present in the filesystem
Always_use_fragments option is not specified
Duplicates are removed
Filesystem size 8322.10 Kbytes (8.13 Mbytes)
Block size 131072
Number of fragments 19
Number of inodes 620
Number of ids 1

segor@segor-Aspire-1640Z:~$ fakeroot unsquashfs mtd5.img
Parallel unsquashfs: Using 1 processor
587 inodes (724 blocks) to write

[===============================================================-] 724/724 100%
created 410 files
created 33 directories
created 177 symlinks
created 0 devices
created 0 fifos

segor@segor-Aspire-1640Z:~$ sudo date 080714122013.49 && fakeroot mksquashfs squashfs-root/ mtd5_1.img -all-root
[sudo] password for segor: 
Ср. авг.  7 14:12:49 ALMT 2013
Parallel mksquashfs: Using 1 processor
Creating 4.0 filesystem on mtd5_1.img, block size 131072.
[===============================================================|] 547/547 100%
Exportable Squashfs 4.0 filesystem, data block size 131072
	compressed data, compressed metadata, compressed fragments
	duplicates are removed
Filesystem size 8322.04 Kbytes (8.13 Mbytes)
	40.03% of uncompressed filesystem size (20787.71 Kbytes)
Inode table size 5534 bytes (5.40 Kbytes)
	26.61% of uncompressed inode table size (20800 bytes)
Directory table size 6444 bytes (6.29 Kbytes)
	49.44% of uncompressed directory table size (13035 bytes)
Number of duplicate files found 1
Number of inodes 620
Number of files 410
Number of fragments 19
Number of symbolic links  177
Number of device nodes 0
Number of fifo nodes 0
Number of socket nodes 0
Number of directories 33
Number of ids (unique uids + gids) 1
Number of uids 1
	root (0)
Number of gids 1
	root (0)

segor@segor-Aspire-1640Z:~$ unsquashfs -s mtd5_1.imgFound a valid SQUASHFS 4:0 superblock on mtd5_1.img.
Creation or last append time Wed Aug  7 14:12:54 2013
Filesystem is exportable via NFS
Inodes are compressed
Data is compressed
Fragments are compressed
Check data is not present in the filesystem
Fragments are present in the filesystem
Always_use_fragments option is not specified
Duplicates are removed
Filesystem size 8322.04 Kbytes (8.13 Mbytes)
Block size 131072
Number of fragments 19
Number of inodes 620
Number of ids 1