System administration command. Search device for bad blocks. You must specify the number of blocks on the device (block-count).
Expect blocksize-byte blocks.
Test blocksize-byte blocks at a time. Default is 16.
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.
Test by writing to each block and then reading back from it.