What pattern(s) does non-destructive badblocks -n write?

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1















man badblocks says:




 -n Use non-destructive read-write mode. By default only a non-
destructive read-only test is done. This option must not be
combined with the -w option, as they are mutually exclusive.



This answer says:




The non-destructive read-write test works by overwriting data, then reading to verify, and then writing the original data back afterwards.




What pattern(s) are used by -n if none are explicitly specified by -t?










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    1















    man badblocks says:




     -n Use non-destructive read-write mode. By default only a non-
    destructive read-only test is done. This option must not be
    combined with the -w option, as they are mutually exclusive.



    This answer says:




    The non-destructive read-write test works by overwriting data, then reading to verify, and then writing the original data back afterwards.




    What pattern(s) are used by -n if none are explicitly specified by -t?










    share|improve this question
























      1












      1








      1








      man badblocks says:




       -n Use non-destructive read-write mode. By default only a non-
      destructive read-only test is done. This option must not be
      combined with the -w option, as they are mutually exclusive.



      This answer says:




      The non-destructive read-write test works by overwriting data, then reading to verify, and then writing the original data back afterwards.




      What pattern(s) are used by -n if none are explicitly specified by -t?










      share|improve this question














      man badblocks says:




       -n Use non-destructive read-write mode. By default only a non-
      destructive read-only test is done. This option must not be
      combined with the -w option, as they are mutually exclusive.



      This answer says:




      The non-destructive read-write test works by overwriting data, then reading to verify, and then writing the original data back afterwards.




      What pattern(s) are used by -n if none are explicitly specified by -t?







      badblocks






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      asked Feb 4 at 8:49









      Tom HaleTom Hale

      7,16033897




      7,16033897




















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          The default pattern with -n is a random pattern:



          const unsigned int patterns = ~0 ;


          (see pattern_fill for the equivalence to “random”).



          In destructive mode, four patterns are used:



          const unsigned int patterns = 0xaa, 0x55, 0xff, 0x00;





          share|improve this answer
























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            The default pattern with -n is a random pattern:



            const unsigned int patterns = ~0 ;


            (see pattern_fill for the equivalence to “random”).



            In destructive mode, four patterns are used:



            const unsigned int patterns = 0xaa, 0x55, 0xff, 0x00;





            share|improve this answer





























              1














              The default pattern with -n is a random pattern:



              const unsigned int patterns = ~0 ;


              (see pattern_fill for the equivalence to “random”).



              In destructive mode, four patterns are used:



              const unsigned int patterns = 0xaa, 0x55, 0xff, 0x00;





              share|improve this answer



























                1












                1








                1







                The default pattern with -n is a random pattern:



                const unsigned int patterns = ~0 ;


                (see pattern_fill for the equivalence to “random”).



                In destructive mode, four patterns are used:



                const unsigned int patterns = 0xaa, 0x55, 0xff, 0x00;





                share|improve this answer















                The default pattern with -n is a random pattern:



                const unsigned int patterns = ~0 ;


                (see pattern_fill for the equivalence to “random”).



                In destructive mode, four patterns are used:



                const unsigned int patterns = 0xaa, 0x55, 0xff, 0x00;






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Feb 4 at 9:21

























                answered Feb 4 at 9:00









                Stephen KittStephen Kitt

                173k24395471




                173k24395471



























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