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# Linux badblocks Command [ Linux Command Manual](#) The Linux `badblocks` command is used to check for bad blocks on a disk device. When executing the command, you must specify the disk device to be checked and the number of blocks on that device. ### Syntax `badblocks ` **Parameter Description**: * `-b ` Specifies the block size of the disk, in bytes. * `-o ` Writes the check results to the specified output file. * `-s` Displays progress during the check. * `-v` Displays detailed information during execution. * `-w` Performs a write test during the check. * `` Specifies the disk device to be checked. * `` Specifies the total number of blocks on the disk device. * `` Specifies the block number from which to start checking. ### Example View current hard disk information. ```bash # fdisk -l For example, the displayed information might be: Disk /dev/sda: 298.9 GB, 298999349248 bytes 255 heads, 63 sectors/track, 36351 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 1 262 2104483+ 82 Linux swap / Solaris /dev/sda2 * 263 32898 262148670 83 Linux /dev/sda3 32899 36351 27736222+ 83 Linux Disk /dev/sdb: 42.9 GB, 42949672960 bytes 64 heads, 32 sectors/track, 40960 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Scan the hard disk using the command. ```bash # badblocks -s -v /dev/sdnx Here, `n` represents the hard disk device name, and `x` represents the partition number corresponding to the hard disk. For example, to check "/dev/sda2", execute the following command: ```bash # badblocks -s -v /dev/sda2 Checking blocks 0 to 30681000 Checking for bad blocks (read-only test): 30680960 0674112/ 306810000000 30680964 30680965 30680966 30680967 30680968 30680969 30680970 30680971 30680972 30680973 ... done Pass completed, 37 bad blocks found. Here, "37 bad blocks found" indicates that there are 37 bad blocks on the hard disk. [ Linux Command Manual](#)