ubuntu@ubuntu:/dev$ sudo badblocks -n -s -v /dev/sda
Checking for bad blocks in non-destructive read-write mode
From block 0 to 732574583
Checking for bad blocks (non-destructive read-write test)
Testing with random pattern:   0.23% done, 1:47 elapsed
                               0.92% done, 7:09 elapsed
                               1.00% done, 7:46 elapsed
                              25.13% done, 3:49:32 elapsed
                              25.13% done, 3:49:33 elapsed
                              25.13% done, 3:49:34 elapsed
                              25.13% done, 3:49:35 elapsed