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Old 18th October 2008
ccc ccc is offline
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Default check for badblocks

hi

howto check freeBSD 7.0 for badblocks ?
is it possible to start the badblocks check on running freeBSD without damage the system ?
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Old 18th October 2008
J65nko J65nko is offline
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Go to the website of the manufacturer of your disk and download an utility to scan the drive for bad blocks. (Usually a MS-DOS or Windows utility)

If you want to pay some bucks and make Steve Gibson rich, get his Spinrite program from grc.com
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Old 18th October 2008
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vermaden vermaden is offline
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You can do it like that:
Code:
% dd < /dev/ad0 > /dev/null
it will read every block of your hard drive, if you get any read errors, then you have bad sectors.

You can also try to "fix" these bad sectors with gshred from coreutils package:
Code:
# gshred --verbose /dev/ad0
But keep in mind that gshred will erase all your data from this drive.
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Old 18th October 2008
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man dd example section says?:
Code:
     Check that a disk drive contains no bad blocks:

	   dd if=/dev/ad0 of=/dev/null bs=1m

     Do a refresh of a disk drive, in order to prevent presently recoverable
     read errors from progressing into unrecoverable read errors:

	   dd if=/dev/ad0 of=/dev/ad0 bs=1m
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Old 30th October 2008
ccc ccc is offline
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thx,

can I check the system for bad sectors (just a test) using read only option
on a running system without single mode or unmout the partitions ?
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Old 30th October 2008
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yes, with that:
% dd < /dev/ad0 > /dev/null
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