Van een website(ben vergeten waar), en natuurlijk je eigen risico als je het gebruikt. Met google zoeken op badblocks.
sudo badblocks -nvs /dev/sda
sda is de hardeschijf of sd of cf kaart.
Read-only Test
This is a non-destructive read-only test which can be run on disk even if it contains a mounted filesystem. It simply verifies that each block can be read; it does not test for write errors.
* sudo badblocks -s -v -c 10240 /dev/sdx
o -s = show progress
o -v = verbose mode
o -c 10240 - check 10K blocks at a time
Read-write Test
This test is non-destructive read-write test which reads each block, writes it, then verifies it. It should not be used on block devices with mounted filesystems as it can lead to filesystem corruption.
* sudo badblocks -n -s -v -c 10240 /dev/sdx
o -n = non-destructive read-write mode
o -s = show progress
o -v = verbose mode
o -c 10240 - check 10K blocks at a time
Write-mode Test
Using this command will erase all data on the device so only use it if that is what you want. This will write a few patterns to each block, verifying that each one is written and read correctly.
* sudo badblocks -w -s -v -c 10240 /dev/sdx
o -w = destructive write-mode test
o -s = show progress
o -v = verbose mode
o -c 10240 - check 10K blocks at a time
Prepare a disk for encryption
The command will completely erase the data on a disk and replace it with random data. This is often a preferred way to prepare a disk for encryption as it is faster than other methods of filling a disk with random data and serves the purpose of checking the disk for errors before the encryption process.
* sudo badblocks -w -t random -s -v -c 10240 /dev/sdx
o -w = destructive write-mode test
o -t random = write random data onto the disk
o -s = show progress
o -v = verbose mode
o -c 10240 - check 10K blocks at a time
