2017-06-11 14:30:40 +01:00
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# badblocks
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> Search a device for bad blocks.
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> Some usages of badblocks can cause destructive actions, such as erasing all the data on a disk, including the partition table.
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- Search a disk for bad blocks by using a non-destructive read-only test:
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`sudo badblocks {{/dev/sda}}`
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- Search an unmounted disk for bad blocks with a non-destructive read-write test:
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`sudo badblocks -n {{/dev/sda}}`
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- Search an unmounted disk for bad blocks with a destructive write test:
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`sudo badblocks -w {{/dev/sda}}`
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2020-01-15 09:50:37 +00:00
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- Search an unmounted disk for bad blocks with a destructive write test and show verbose status:
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`sudo badblocks -svw {{/dev/sda}}`
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- Search an unmounted disk in desctructive mode and output found blocks to a file:
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`sudo badblocks -o {{/path/to/file}} -w {{/dev/sda}}`
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- Search an unmounted disk in desctructive mode with improved speed using 4K block size and 64K block count:
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`sudo badblocks -w -b {{4096}} -c {{65536}} {{/dev/sda}}`
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