System administration command. Search device for bad blocks. You must specify the number of blocks on the device (block-count). e2fsck and mke2fs will invoke badblocks automatically when given the -c option.
Expect blocksize-byte blocks.
Test blocksize-byte blocks at a time. Default is 16.
Abort test after finding specified number of blocks.
Force a read/write or nondestructive write test on a mounted device. Use only when /etc/mtab incorrectly reports a device as mounted.
Skip test of known bad blocks listed in file.
Perform a nondestructive test by writing to each block and then reading back from it while preserving data.
Direct output to file.
Repeat search of device until no new bad blocks have been found in number passes. Default is 0.
Show block numbers as they are checked.
Test blocks by reading and writing the specified pattern. You may specify pattern as a positive integer or as the word random. If you specify multiple patterns, badblocks tests all blocks with one pattern, and then tests all blocks again with the next pattern. Read-only mode accepts only one pattern. It does not accept random.
Test by writing to each block and then reading back from it. This option will destroy data. Don’t use it on devices that contain filesystems.