Sherlock (TV series) is on discs that are read with a blue laser.
Blu-ray or Blu-ray Disc ( BD ) is a digital optical disc data storage format . The name `` Blu-ray '' refers to the blue laser ( specifically , a violet laser ) used to read the disc , which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs . Sherlock (TV series) . All of the series have been released on DVD and Blu-ray , alongside tie-in editions of selected original Conan Doyle stories and original soundtrack composed by David Arnold and Michael Price .