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fsck bad or duplicate block(s)

ed987 asked
Last Modified: 2013-12-16
at boot disk gets scanned,  bad or duplicate block(s) are reported.
it says i have to run fsck manually.

what fsck arguments should i use ?
i used "fsck /dev/sda1" "fsck -f /dev/sda1" "fsck -c /dev/sda1" but it just displayed some short data, filesystem modified and exited.
after reboot it scans again, with same errors :(

i tried tried removing problematic files manually, umount /dev/sda1 .... mount -o rw,remount /dev/sda1 , but it displays "read only filesystem".

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