Linux badblocks command
Linux Command ReferenceThe Linux badblocks command is used to check damaged blocks on disk devices.
When executing this command, you must specify the disk device to be checked and the number of disk blocks on the device.
Syntax
badblocks [-svw][-b <区块大小>][-o <输出文件>][磁盘装置][磁盘区块数][启始区块]
Parameter Description：
- -b<block size> Specifies the block size of the disk, in bytes.
- -o<output file> 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.
- [disk device] Specifies the disk device to be checked.
- [disk block count] Specifies the total number of blocks on the disk device.
- [start block] Specifies which block to start the check from.
Examples
View the system's current hard disk information.
# fdisk -l
For example, the displayed information is as follows:
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 with the command.
# badblocks -s -v /dev/sdnx
Here, n represents the hard disk device name, and x represents the corresponding partition number of the hard disk. For example, to check "/dev/sda2", execute the command as follows:
# badblocks -s -v /dev/sda2 Checking blocks 0 to 30681000 Checking for bad blocks (read-only test): 306809600674112/ 306810000000 30680964 30680965 30680966 30680967 30680968 30680969 30680970 30680971 30680972 30680973 ... done Pass completed, 37 bad blocks found.其中，“37 bad blocks found”表示硬盘存在37个坏块。Other Extensions