badblocks

all

Search a device for bad blocks. Some usages of badblocks can cause destructive actions, such as erasing all data on a disk, including the partition table.

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Examples (6)

Search a disk for bad blocks by using a non-destructive read-only test

sudo badblocks /dev/sdX

Search an unmounted disk for bad blocks with a [n]on-destructive read-write test

sudo badblocks -n /dev/sdX

Search an unmounted disk for bad blocks with a destructive [w]rite test

sudo badblocks -w /dev/sdX

Use the destructive [w]rite test and [s]how [v]erbose progress

sudo badblocks -svw /dev/sdX

In destructive mode, [o]utput found blocks to a file

sudo badblocks -o path/to/file -w /dev/sdX

Use the destructive mode with improved speed using 4K [b]lock size and 64K block [c]ount

sudo badblocks -w -b 4096 -c 65536 /dev/sdX

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