-J     Get/set the Western Digital (WD) Green Drive's "idle3" timeout value.  This timeout controls how often the drive parks its heads and enters a low power consumption state.   The  factory  de‐
              fault  is eight (8) seconds, which is a very poor choice for use with Linux.  Leaving it at the default will result in hundreds of thousands of head load/unload cycles in a very short period
              of time.  The drive mechanism is only rated for 300,000 to 1,000,000 cycles, so leaving it at the default could result in premature failure, not to mention  the  performance  impact  of  the
              drive often having to wake-up before doing routine I/O.

              WD  supply  a WDIDLE3.EXE DOS utility for tweaking this setting, and you should use that program instead of hdparm if at all possible.  The reverse-engineered implementation in hdparm is not
              as complete as the original official program, even though it does seem to work on at a least a few drives.  A full power cycle is required for any change in setting to take  effect,  regard‐
              less of which program is used to tweak things.

              A  setting of 30 seconds is recommended for Linux use.  Permitted values are from 8 to 12 seconds, and from 30 to 300 seconds in 30-second increments.  Specify a value of zero (0) to disable
              the WD idle3 timer completely (NOT RECOMMENDED!).